17B.If we call the amount of DNA per genome x, identify a situation in diploid organisms where the amount of DNA per cell is equal to 2x.
A.in the nucleolar organizer
B.in cells in g1
C.in the kinetochores
D.in cells after s but prior to cell division
E.in gametes
17C.If we call the amount of DNA per genome x, identify a situation in diploid organisms where the amount of DNA per cell is equal to 4x.
A.in the nucleolar organizer
B.in cells in g1
C.in the kinetochores
D.in cells after s but prior to cell division
E.in gametes

Primates are generally uniparous, giving birth to and raising only one offspring at a time.

However, there are two major exceptions to this rule: the Callitrichidae family (marmosets and tamarins) and the Cebidae family (capuchin and squirrel monkeys). These families are known for having multiple offspring at once, with marmosets and tamarins typically giving birth to twins or even triplets, and capuchin and squirrel monkeys often having twins.

This reproductive strategy allows these species to produce more offspring and increase their chances of survival in their challenging environments. Additionally, these species exhibit cooperative breeding behaviors, with all members of the group helping to care for and raise the young.

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Numerous substances make up the ECM, such as collagen fibers, proteoglycans, fibronectins, laminin, etc., which is a complex network of proteins and carbohydrates.

There are many ways that cells and the ECM communicate with one another. Particular elements of the ECM, including collagen, fibronectin, and laminin, are bound by integrin receptors on the cell surface. Cell adhesion, migration, proliferation, and differentiation are just a few of the biological activities that are regulated by this binding's intracellular signaling pathways.

Additionally, ECM components are secreted and broken down by cells, altering the ECM's composition and structure and changing how cells behave. Additionally, growth factors and other signaling molecules that might affect cell behavior and tissue formation can be sequestered and released by ECM components.

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The correct statement regarding childbirth is: "b. the cervix thins and dilates so that the baby can exit the uterus."

a. Breech birth is when the baby's buttocks or feet are positioned to exit the uterus first. Practicing the Lamaze method, which is a childbirth education technique focusing on breathing and relaxation, cannot prevent a breech birth. The Lamaze method can help prepare expectant mothers for childbirth and reduce anxiety, but it does not specifically prevent breech birth.

b. During childbirth, the cervix indeed thins (effaces) and dilates (opens) to allow the baby to exit the uterus. This is a necessary process for a successful vaginal delivery.

c. The intensity of contractions typically increases during the second stage of labor, which is the stage when the baby is actively being pushed through the birth canal and out of the uterus.

d. The placenta is usually expelled after the baby's birth, not immediately before the baby's head appears. This occurs during the third stage of labor, also known as the placental stage.

Thus the correct statement is b; the cervix thins and dilates so that the baby can exit the uterus.

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The wobble hypothesis is a theory that explains how some tRNA molecules can recognize and bind to multiple codons in mRNA during protein synthesis. This is possible due to the flexibility of the third nucleotide in the codon, which can base pair with different nucleotides in the anticodon loop of tRNA.

The wobble hypothesis also suggests that certain tRNA molecules have a higher percentage of modified bases, which can enhance their ability to recognize multiple codons. In protein synthesis, mRNA carries the genetic code from DNA to the ribosome, where it is translated into a protein by tRNA. The process of transcription and translation are separated in time and space in both prokaryotes and eukaryotes. Transcription occurs in the nucleus of eukaryotic cells, while translation occurs in the cytoplasm. In prokaryotic cells, transcription and translation can occur simultaneously in the cytoplasm.

A key component of protein synthesis is the polysome, which consists of multiple ribosomes bound to a single mRNA molecule. This allows for multiple copies of the protein to be produced simultaneously, increasing the efficiency of the process. During protein synthesis, tRNA molecules deliver the appropriate amino acids to the ribosome, guided by the codons in the mRNA. Once the ribosome reaches a stop codon, release factors facilitate the termination of protein synthesis.

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The sensory neurons are responsible for relaying sensory information from structures in the head, such as the eyes, ears, nose, and tongue, into the central nervous system.

How is sensory information transmitted?

Sensory information is transmitted via the spinal cord, which serves as a conduit for the signals to reach the brain. Once the information reaches the brain, it is processed and interpreted, allowing us to perceive our surroundings and respond accordingly.
Structures involved in sensory transmission:

The structures that relay sensory information from the head into the central nervous system are the cranial nerves. These nerves contain sensory neurons that transmit information from various structures in the head, such as the eyes, ears, nose, and mouth, to the central nervous system, which consists of the brain and spinal cord. The sensory neurons in the cranial nerves are responsible for sending signals related to vision, hearing, smell, taste, and touch, allowing the brain to process and interpret these sensations.

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Large body sizes that require more energy and weaponry that can cause severe injury demonstrate that sexual selection is stronger than natural selection.

Large body sizes that require more energy and weaponry and can cause severe injury are often seen as traits that are favored by sexual selection rather than natural selection. This is because these traits are often more attractive to potential mates and can increase an individual's reproductive success. In primates, intersexual selection is particularly strong, with females often choosing larger and more dominant males as mates. This can lead to significant variation in male reproductive success, while female reproductive success is generally less variable. Therefore, the answer to your question is that intersexual selection is strong in primates, which suggests that sexual selection is stronger than natural selection in shaping the evolution of traits such as large body size.

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, the number of unique viral RNAs that would be found in the cytoplasm of a retrovirus-infected cell can vary depending on various factors such as the specific retrovirus genome structure and the stage of the viral life cycle.

During the replication cycle of a retrovirus, the viral RNA genome is reverse transcribed into DNA by the viral enzyme reverse transcriptase, and the resulting DNA is integrated into the host genome. The integrated DNA can then be transcribed and translated to produce new viral particles.

Thus, the number of unique viral RNAs that would be found in the cytoplasm of a retrovirus-infected cell would depend on the specific retrovirus genome structure and the number of distinct viral genes that are transcribed and translated. In general, retroviruses can have multiple genes that are expressed as separate viral RNAs, such as the gag, pol, and env genes in the HIV genome.

Therefore, without specific information about the retrovirus genome being referred to, it is not possible to accurately determine the number of unique viral RNAs that would be found in the cytoplasm.

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The two correct answers for mutations that would result in a uvrA constitutive phenotype are:

B) mutation purvA-purvA- (mutation in the promoter)
D) mutation lexA-lexA- (mutation in the repressor gene product)

A constitutive phenotype means the uvrA gene is expressed continuously, regardless of the presence of DNA damage.

B) A mutation in the promoter region (purvA-purvA-) can lead to constitutive expression, as it may cause the RNA polymerase to bind more efficiently or continuously to the promoter, thus increasing the transcription of the uvrA gene.

D) A mutation in the repressor gene product (lexA-lexA-) may cause a defective repressor protein that is unable to bind to the operator region, leading to the constitutive expression of the uvrA gene.

A) A mutation in the operator region (OuvrA-OuvrA-) would not necessarily lead to constitutive expression of uvrA, as it depends on how the mutation affects the binding of the repressor protein.

C) Mutation in the uvrA gene itself (uvrA-uvrA-) would not cause constitutive expression but could alter the function of the uvrA protein.

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The answer is e. latent period. The muscle twitch occurs during the time when the action potential moves through the sarcolemma.

During the latent period, there is no visible change in muscle length or tension. It is the brief period of time between the arrival of the action potential at the neuromuscular junction and the onset of muscle contraction.

During this phase, the action potential spreads along the sarcolemma and triggers the release of calcium ions from the sarcoplasmic reticulum. These calcium ions then bind to troponin, leading to the exposure of active sites on actin and the initiation of cross-bridge formation between actin and myosin, which ultimately results in muscle contraction.

Therefore, the latent period is the initial stage of muscle excitation and preparation for contraction, occurring before the actual muscle contraction phase (a) begins.

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Answer:g

Explanation:

C. Both A and Rh antigens are present on the surface of erythrocytes of blood type AB.

The blood group antigens Rh Antigens are located on the exterior of red blood cells. The presence or not of the A and B antigens at the surface of red blood cells determines the ABO blood group system.

The system for Rh blood groups is based on whether or not the Rh antigen is present on the outer layer of red blood cells. A blood group is a type of blood classification based on whether there are or absence of certain antibodies on the outer layer of red blood cells.

The ABO blood group system is the most recognized blood group system, and it is based on the presence or lack of A and B antigens upon the surface of red blood cells.

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A, B, and Rh antigens are present on the surface of erythrocytes of blood type AB–. So, option B is accurate.

The AB- blood group means that the red blood cells have both A and B antigens but do not have Rh factor on their surface. This blood group can only receive blood from donors with the same ABO and Rh blood types (i.e., AB-, A-, B-, O-).

A, B, and Rh antigens are specific proteins found on the surface of red blood cells. A and B antigens are determined by the presence of specific carbohydrates on the surface of the cells, while Rh antigen is a protein. The presence or absence of these antigens on the red blood cells determines a person's blood type.

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The lac operon transcription is suppressed when glucose is present in the cell because the presence of glucose causes the catabolite activator protein (CAP) to not bind to the promoter region of the lac operon, thereby inhibiting transcription.

The condition that suppresses lac operon transcription is the presence of high glucose levels and the absence of lactose in the environment. The catabolite repression takes place in this situation, and the lac operon is not transcribed.

This occurs because the cAMP levels are low due to high glucose levels, which prevents the activation of CAP (catabolite activator protein). Without CAP activation, RNA polymerase cannot efficiently bind to the promoter, and transcription of the lac operon is suppressed.

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During cellular respiration, the following substances are used:

1. Glucose: This is the primary source of energy for the cells.

2. Oxygen: This is essential for the process of aerobic respiration, where glucose is broken down into energy.

3. ADP (Adenosine diphosphate) and Pi (Inorganic phosphate): These are converted into ATP (Adenosine triphosphate) during cellular respiration to provide energy for the cells.

4. NAD+ (Nicotinamide adenine dinucleotide) and FAD (Flavin adenine dinucleotide): These molecules are used as electron carriers during cellular respiration, shuttling electrons from one metabolic reaction to another.

5. Water: This is produced as a byproduct during cellular respiration when oxygen accepts electrons and protons to form water.

Together, these substances are used in the process of cellular respiration to produce energy that is required for the proper functioning of cells in the body.

True. Immature plants have more non-protein nitrogen (NPN) and less lignin-bound nitrogen compared to mature plants. This leads to a higher ratio of rumen degradable protein (RDP) to rumen undegradable protein (RUP) in immature plants.

NPN refers to nitrogen that is not bound to proteins and is more readily available for rumen microbes to break down and utilize. Lignin, on the other hand, is a complex polymer that makes up the structural components of mature plants, making the protein-bound nitrogen less accessible to rumen microbes.

Therefore, immature plants with higher NPN and lower lignin-bound nitrogen have a greater proportion of protein that is available for rumen fermentation, resulting in a higher RDP to RUP ratio. This can lead to increased feed intake and improved animal performance. However, it is important to note that as plants mature, their lignin content increases and their protein quality decreases, which can have negative impacts on animal nutrition.

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True. Immature plants have more non-protein nitrogen (NPN) and less lignin-bound nitrogen compared to mature plants. This leads to a higher ratio of rumen degradable protein (RDP) to rumen undegradable protein (RUP) in immature plants.

NPN refers to nitrogen that is not bound to proteins and is more readily available for rumen microbes to break down and utilize. Lignin, on the other hand, is a complex polymer that makes up the structural components of mature plants, making the protein-bound nitrogen less accessible to rumen microbes.

Therefore, immature plants with higher NPN and lower lignin-bound nitrogen have a greater proportion of protein that is available for rumen fermentation, resulting in a higher RDP to RUP ratio. This can lead to increased feed intake and improved animal performance. However, it is important to note that as plants mature, their lignin content increases and their protein quality decreases, which can have negative impacts on animal nutrition.

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The muscle of the mouth that draws the corner of the mouth out and back is the risorius muscle. It is a narrow band of muscle that originates from the fascia over the masseter muscle and inserts into the skin at the corner of the mouth.

The risorius muscle is one of the muscles that helps in smiling and laughing. It is located in the cheek region and extends from the corner of the mouth towards the ear. The triangularis muscle, on the other hand, helps in depressing the corner of the mouth, whereas the mentalis muscle helps in elevating the lower lip and chin. The orbicularis oris muscle is a circular muscle that encircles the mouth and helps in puckering the lips. In summary, the risorius muscle is responsible for drawing the corner of the mouth out and back, which is crucial for facial expressions like smiling and laughing.

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Explanation:

A. Nervous tissue

B. Skeletal muscle tissue

C. Loose and dense connective tissue

E. Vascular tissues (blood vessels)

Nervous tissue is present in skeletal muscles in the form of motor neurons that innervate individual muscle fibers. Skeletal muscle tissue is the primary component of the muscle organ and is responsible for generating force and movement. Connective tissues such as tendons, ligaments, and fascia provide structural support and help to transmit forces generated by the muscle. Blood vessels supply the muscle with oxygen and nutrients, and remove waste products. Hyaline cartilage is not a component of skeletal muscle tissue.

The advent of agriculture was the third of the major events that stimulated an increase in the size of the human population The correct answer is D.

The advent of agriculture. The three major events that stimulated an increase in the size of the human population are:

The development of agriculture - allowed humans to settle in one place, produce more food, and support larger populations.

The industrial revolution - this brought about advances in technology, medicine, and sanitation, leading to improved living conditions and increased life expectancy.

The discovery of vaccines and antibiotics - these medical advancements helped control and prevent the spread of infectious diseases, further improving human health and survival rates.

While the discovery of vaccines and antibiotics have undoubtedly played a significant role in reducing mortality rates and improving human health, they came after the advent of agriculture and the industrial revolution, and are therefore not the third major event that stimulated an increase in the size of the human population.

Therefore, the correct answer is D) the advent of agriculture.

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Both maximum likelihood and Bayesian methods are used to evaluate phylogenies, but they differ in several characteristics.

Maximum likelihood methods are based on the principle of likelihood, which determines the probability that a given data set can be reconstructed using a specific tree topology and evolutionary model. This approach assumes that the data are independent and identically distributed, and that the model parameters are known. Maximum likelihood analysis begins with an a priori evolutionary model, which is used to estimate the likelihood of each tree topology. The tree with the highest likelihood is then selected as the best estimate of the true tree.

On the other hand, Bayesian methods are based on the principles of probability theory, which determine the probability that a hypothetical tree is correct given the data and prior knowledge. This approach assumes that the data are probabilistic and that the model parameters are unknown. Bayesian analysis also begins with an a priori evolutionary model, but in this case, the prior distribution is used to estimate the posterior probability of each tree topology. The tree with the highest posterior probability is then selected as the best estimate of the true tree.

In summary, both maximum likelihood and Bayesian methods are powerful tools for phylogenetic analysis, but they differ in their underlying principles and assumptions. Maximum likelihood methods are based on the principle of likelihood, assume that the data are independent and identically distributed, and are used to estimate the best tree topology. Bayesian methods are based on the principles of probability theory, assume that the data are probabilistic, and are used to estimate the posterior probability of each tree topology.

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The class of cnidarians that have members that ALL have the polyp body form as adults are Class Anthozoa.

Class Anthozoa of cnidaria:

Members of this class include coral and sea anemones, which are sessile polyps that use cnidocytes for defense and prey capture and can reproduce through budding and regeneration. Class Anthozoa includes sessile polyps, which are immobile, attached organisms that make up the adult form. These polyps have cnidocytes, specialized cells containing stinging organelles used for defense and capturing prey.

Anthozoans reproduce asexually through a process called budding, where new polyps grow from the parent polyp. They can also undergo regeneration, which allows them to heal and regrow parts of their body if damaged.

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Phylogeny is the study of evolutionary relationships between different species. It is possible to reconstruct the phylogeny of organisms by analyzing the traits they possess.

Similar traits in different species suggest a common ancestor, while different traits suggest divergent evolution. This is known as comparative morphology, where scientists compare the physical characteristics of different organisms to understand their evolutionary relationships.

However, it is important to note that some traits may be similar due to convergent evolution rather than a shared ancestry. Other methods, such as molecular sequencing, can also be used to reconstruct phylogenies.

By understanding the evolutionary history of different species, we can gain insight into how they have adapted and changed over time, as well as the biodiversity of life on our planet.

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The head and neck receive blood supply from several major arteries and veins. The common carotid arteries are located on either side of the neck and are responsible for supplying oxygenated blood to the head and neck.

These arteries bifurcate into the internal and external carotid arteries, which supply blood to the brain and face, respectively. The vertebral arteries, located in the neck, supply blood to the back of the brain. The venous drainage of the head and neck is facilitated by the internal jugular veins, which drain deoxygenated blood from the brain, face, and neck. These veins merge with the subclavian veins to form the brachiocephalic veins, which ultimately drain into the superior vena cava. Additionally, the external jugular veins drain blood from the scalp and face into the subclavian veins. Other important arteries and veins that supply and drain the head and neck include the facial artery and vein, maxillary artery and vein, and occipital artery and vein.

In summary, these vessels are responsible for supplying blood to the facial muscles, ears, and scalp. Overall, the intricate network of arteries and veins in the head and neck ensures that vital organs and tissues receive the necessary oxygen and nutrients for proper function.

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Answer: The circulatory system moves waste products to the excretory system, where they are filtered and eliminated from the body, maintaining proper physiological function.

Explanation: The excretory system and the circulatory system work together to remove waste from the body. The excretory system removes waste products produced by the body's metabolic processes, such as urea, excess salts, and water, while the circulatory system transports these waste products to the organs of the excretory system for elimination.

The circulatory system moves blood through the body via the heart, arteries, veins, and capillaries. Blood is responsible for transporting waste products from various parts of the body to the kidneys, lungs, and liver. The kidneys filter out waste products and excess water from the blood, which is then transported to the bladder for elimination as urine. The liver also plays a key role in removing toxins from the blood and breaking them down into less harmful substances, which are eliminated from the body through urine or feces.

The statement "Lactase persistence is an example of human evolution; it is a human evolutionary adaptation to drinking milk from domesticated animals" is true because it is a result of a genetic mutation. The statement "Inhibiting RNA processing is a common way to regulate gene expression" is true because doing so can control the expression of genes at distinct levels.

Lactase persistence is a result of a genetic mutation that occurred in human populations that relied on dairy products for survival. This mutation allows individuals to continue producing lactase, the enzyme needed to digest lactose, into adulthood. This is an example of human evolution and adaptation to changing dietary habits.
Inhibiting RNA processing is a common way to regulate gene expression. RNA processing refers to the modifications made to RNA molecules after transcription from DNA. By inhibiting certain steps in this process, cells can control which genes are expressed and at what levels.

Therefore, inhibiting RNA processing can be a way to regulate gene expression.

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c. positive nitrogen balance.  When a person consumes more protein than is excreted, this is  positive nitrogen balance.

When a person consumes more protein than is excreted, the body is in a state of positive nitrogen balance. This means that there is an excess of protein available for the body to use for various functions such as building and repairing tissues, producing enzymes and hormones, and maintaining a healthy immune system. Positive nitrogen balance is essential for growth and development, especially in children and adolescents, as well as for athletes and people recovering from illness or injury. On the other hand, negative nitrogen balance occurs when the body excretes more nitrogen than it consumes, indicating a breakdown of muscle tissue and other protein-rich structures in the body.

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In the ferret experiment from MIT where both the inferior colliculus and superior colliculus were lesioned, the auditory cortex responded to visual stimuli, indicating that there was cross-modal plasticity. Therefore, the correct answer is option c.

In the MIT ferret experiment, researchers aimed to investigate the effect of lesions in the inferior and superior colliculus regions of the brain on the neural response to sensory stimuli. They found that ferrets with lesions in both regions showed cross-modal plasticity, where the auditory cortex responded to visual stimuli. This indicated that the brain had reorganized itself to compensate for the loss of sensory input from the damaged regions.

The findings of this study have important implications for our understanding of the brain's ability to adapt to changes in sensory input and for the development of therapies for individuals with sensory impairments. It suggests that the brain is capable of reorganizing itself in response to changes in sensory input, and that this reorganization can occur at multiple levels of the neural circuitry. Additionally, the study highlights the importance of considering multiple brain regions when studying the processing of sensory information and the potential for cross-modal interactions between sensory modalities.

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Option 1 is correct. Two months of four-drug therapy (INH, rifampin, pyrazinamide, and ethambutol) followed by Four months of INH and rifampin2.

The usual course of treatment for tuberculosis consists of a mix of antibiotics administered over several months. The precise regimen may change based on elements like the patient's age, medical history, and the infecting bacteria's treatment susceptibility.

The conventional initial regimen for treating tuberculosis consists of four medications: isoniazid (INH), rifampin, pyrazinamide, and ethambutol. INH and rifampin are then continued for a further four months.

Option 2, which solely contains INH and pyridoxine, a vitamin B6 supplement frequently provided to those using INH to prevent peripheral neuropathy, is incorrect.

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Complete question

Isabella has confirmed tuberculosis and is placed on a 6-month treatment regimen. The 6-month regimen consists of:

1. Two months of four-drug therapy (INH, rifampin, pyrazinamide, and ethambutol) followed by Four months of INH and rifampin.

2. Six months of INH with daily pyridoxine throughout therapy

3. Six months of INH, rifampin, pyrazinamide, and ethambutol

4. Any of the above

a. It appears that Treatment Group A started the experiment the most hydrated, as their mean urine specific gravity (USG) was the lowest at the start of the experiment.

b. Treatment Group C appears to have started the experiment the most dehydrated, as their mean USG was the highest at the start of the experiment.

c. As a lab researcher, I could have observed the color and odor of the urine to determine the hydration status of the subjects. Clear or pale yellow urine with a mild odor indicates good hydration, while dark yellow or strong-smelling urine indicates dehydration.

d. Yes, the subjects' starting hydration status could have affected the result of the experiment. If a subject starts out dehydrated, they may have a more difficult time achieving the same level of hydration as a subject who starts out well-hydrated.

This could skew the results and make it difficult to draw accurate conclusions about the effectiveness of the hydration interventions.

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Answer:For a class assignment, students were asked to make a homonym chart containing twenty terms and their sound-alike matches.

Explanation:

The two electron carriers found in the process of cellular respiration are NADH and FADH2. Ultimately, these electron carriers bring electrons to the electron transport chain located in the inner mitochondrial membrane.

In cellular respiration, glucose is broken down through a series of metabolic pathways, including glycolysis, the Krebs cycle, and the electron transport chain (ETC).

During these processes, high-energy electrons are transferred from glucose to electron carriers NAD+ and FAD, forming NADH and FADH2, respectively. These electron carriers then deliver the electrons to the ETC, where the electrons are passed through a series of protein complexes.

As the electrons move through the ETC, energy is released and used to pump protons across the inner mitochondrial membrane, creating a proton gradient.

This gradient drives ATP synthesis through a process called oxidative phosphorylation. The electrons are ultimately accepted by oxygen molecules, which combine with protons to form water.

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Complete question:

What are the two electron carriers found in the process of cellular respiration?  Ultimately, where do the electron carriers mentioned in part C bring electrons to?