Increased glucose levels decrease the level of cAMP, leading to less frequent transcription.
The Lac operon contains genes that are involved in metabolism. The genes are only activated when lactose is present and glucose is not. Catabolite activator protein and lac repressor activate and deactivate the operon in response to glucose and lactose levels. The lac repressor prevents the operon from being transcribed.
The lactose operon is required for lactose transport and metabolism in E.coli and many other enteric bacteria. The operon's genes code for proteins that allow bacteria to use lactose as an energy source.
The lac operon's molecular mechanism is as follows: The lac operon consists of a small promoter/operator region (P and O) as well as three larger structural genes, lacZ, lacY, and lacA. The lac operon is preceded by the regulatory gene lacI.
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Which of the following represents a heterozygous genotype?
A. GG
B. gg
C. Gg
D. none of the above
Answer: C) Gg
Explanation:
A heterozygous mixtures include two different genes:
A Dominant and a Reccessive gene. Inorder to have a mixture, you need two different genes, explaining why it would be C.
What TYPE of nucleic acid is found in the Ebolavirus?
Answer:
virion nucleic acid
The virion nucleic acid of Ebola virus consists of a single-stranded RNA with a molecular weight of approximately 4.0 x 10(6).
Explanation:
Which is a compound composed of carbon, hydrogen, and oxygen in a ratio of one oxygen and two hydrogen atoms for each carbon atom?
Beginning at the synapse of a neuron, place the events in neuronal signaling in the correct sequence. 1. Ion channels bind the ligand and open. 2. Na is pumped out of the cell, and the membrane potential is restored. 3. Acetylcholinesterase breaks down acetylcholine. 4. Na enters the postsynaptic cell, and the membrane potential changes. 5. Acetylcholine is released into the synapse. 6. Na ion channels close. 4, 5, 1, 2, 6, 3 6, 4, 3, 1, 2, 5 3, 4, 6, 1, 5, 2 1, 2, 3, 4, 5, 6 5, 1, 4, 3, 6, 2
Answer: 5, 1, 4, 3, 6, 2
Explanation:
The synapse is an intercellular approach between neurons or between a neuron and a muscle or glandular effector cell. At the synapse, the transmission of the nerve impulse takes place. This is initiated by a chemical discharge that causes an electrical current in the membrane of the presynaptic cell (sending cell). Then, once this nerve impulse reaches the end of the axon (the connection with the other cell), the neuron secretes a chemical compound called neurotransmitter that is deposited in the cleft or synaptic space (intermediate space between this transmitting neuron and the postsynaptic or receiving neuron). These secreted substances or neurotransmitters (noradrenaline and acetylcholine among others) are responsible for exciting or inhibiting the action of the other cell called postsynaptic cell.
The events are:
Acetylcholine is released into the synapse (5): Acetylcholine is a neurotransmitter that is released at synapses in response to a specific stimulus. The secreted neurotransmitter acts on specialized receptor sites on the postsynaptic cell, which causes changes in the metabolism of the postsynaptic cell, modifying its cellular activity. Ion channels bind the ligand and open (1): The channels control the transmission between neurons because they bind neurotransmitters and open in response to a ligand. So the neurotransmitters diffuse across the cleft and bidn to receptors.Na enters the postsynaptic cell, and the membrane potential changes (4): Sodium channels open and allow an inward diffusion of sodium ions (Na+) from the outside to the inside. This causes the membrane potential to become less negative or more positive or to approach the threshold potential. Next, this triggers an excitatory potential (EPSP) so it causes the postsynaptic membrane to depolarize and fire an action potential. which spreads along the membrane of the post-synaptic neuron. This means an impulse is transmitted.Acetylcholinesterase breaks down acetylcholine (3): Acetylcholinesterase is an enzyme that breaks down the neurotransmitter so it causes the inactivation of acetylcholine into acetic acid and choline. Na ion channels close (6): Na channels open and close according to different signals. The peak voltage causes them to close, and potassium channels open. So sodium ions stay inside the cell while potassium ions move outside of it. When this happens, repolarization (change in membrane potential that retunrs it to a negative value) takes place. Potassium channels remain open after the potential reaches the resting level causing hyperpolarization (the membrane potential becomes more negative) and it alters the ability of certain of ions to enter the cell. At the end, the cell has more K+ ions on the outside.Na is pumped out of the cell, and the membrane potential is restored (2): The sodium-potassium pump moves sodium ions to the outside and potassium ions to the inside.Help me with these pleaseeeewe
Answer: 13. The magnets in Set 1 will repel, The magnets in Set 1 will attract,The magnets in Set 1 will not move. 14. Set 2 will attract, and the magnets in Set 2 will repel, and the magnets in Set 2 will attract. brainliest?
Explanation:
Explain your reasoning I will give u Brainliest
Answer:
1. A
2. B
Explanation: #2 is B because sedimentary rocks have layers that you see in places such as canyons. Sedimentary rocks are made from grains so you can see that kind of texture in the image. Igneous rocks are made from the cooling and solidification of lava. They have that shiny texture.
Hope this helps! :)
Answer:
1. A
2. B
Explanation:
1. Igneous rocks are formed from by lava, Igneous rocks are various crystalline or glassy rocks formed by the cooling and solidification of molten earth material
2. Sedimentary rocks are formed from pre-existing rocks or pieces of once living organisms. They form from deposits that accumulate on the Earth's surface
Erica uses a door knob to open a door. A door knob is an example of a wheel and axle. The knob of the door is the wheel and the shaft is the axle. As Erica turns the knob, the shaft is also turned, and the door opens. The knob of a door always has a larger radius than the shaft so that the distance over which the force is applied _______ in order to _______ the effort force needed to open the door.
A. Decreases, decrease
B. Increases, increase
C. Decreases, increase
D. Increases, decrease
Answer:
D
Explanation:
The knob of a door always has a larger radius than the shaft so that the distance over which the force is applied increases in order to decrease the effort force needed to open the door. Thus, the correct option for this question is D.
What is Force?A force may be defined as an instance of pushing or pulling on an object with mass. This causes an object to change its velocity. It is an external agent capable of changing a body's state of rest or motion. It has a magnitude and a direction, so it is a vector quantity.
According to the context of this question, a door knob is an example of a wheel and axle. The force that is applied on the knob of the door may effectively increase when it is operated by a person. This stimulates a reduction in the effort through which force is needed to open the door.
Therefore, the correct option for this question is D.
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FILL IN THE BLANK!
Water leaves the cryosphere and joins the rest of the hydrosphere when it
Answer: receives the thermal energy
Explanation:
The cryosphere can be defined as the land which is covered with the surface of ice in the solid form in the form of sea ice, river ice, snow, ice glaciers, ice sheets, frozen water, and others. When the ice on the land receives the thermal energy from the sun or any other source like radiation then it melts into water and it becomes the part of the water body in the form of the hydrosphere.
This is a multiselect question! Select ALL of the following that correctly describe the
function of stem cells:
A)Cells that can differentiate into (become) any type of cell. Ex. blood, muscle, skin
cells.
B)Cells that can renew themselves continuously.
C) Cells that cannot specialize into different types of cells.
D) Cells that come from bone marrow or embryos.
Answer:
A, B, and D
Explanation:
Stem cells are special human cells that are able to develop into many different cell types. They commonly come from bone marrow, and from embryos.
suppose that the local temperate changed in favor of greater oxygen levels in the water. write a short paragraph to describe how both the population of the small fish species and the wading bird population would change in response to the new oxygen lovers over the next six months. then explain why these changes occur
Explanation:
suppose that the local temperate changed in favor of greater oxygen levels in the water. write a short paragraph to describe how both the population of the small fish species and the wading bird population would change in response to the new oxygen lovers over the next six months. then explain why these changes occur
This is related to the serengeti book by sean b carol
Answer:
i dont about this question ❓
PLEASE HELP 20 POINTS RIGHT ANSWERS ONLY
A scientist is studying three different plant species that appear to be closely related. All three are found in a wide variety of environments and are very similar in appearance. Which of the following would provide the best evidence regarding the evolutionary relationship of these three species?
Comparing the different climates in which the species can be found
Comparing the genomes of each species to see which are most similar
Determining whether the plants are capable of both sexual and asexual reproduction
Determining which types of animals eat each species
Determining the genomes of each species to see which is similar will provide the best evidence regarding the evolutionary relationship of these species. So the correct option is B.
What are evolutionary relationships?The relationships of different species with each other based on their history of evolution are called evolutionary relationships.
The study of the relationships between organisms by categorizing them into various kinds of groups is called systematics.
All the species of organisms, from bacteria to mammals have evolved from some kind of ancestral species by the process of evolution.
Determination of these evolutionary relationships is the key to understanding the process of evolution. Evolutionary relationships are determined by using evolutionary trees which are diagrammatic representations of ancestral species and their descendants.
The study of genomics to identify the similarity between organisms is yet another useful tool to determine the relationship between them.
Therefore the correct option is B.
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A segment of dna/chromosome containing the instructions for building a protein which will result in a trait is called a ___
Answer: A segment of dna/chromosome containing the instructions for building a protein which will result in a trait is called a GENE.
Explanation:
CHROMOSOMES are made up of two threads called chromatids joined at a point called the centromere.
In the chemical nature of chromosomes, each is made up of a protein framework which has a long molecule of DNA (deoxyribonucleic acid) coiled round it. A segment of DNA containing the instructions for building a protein which will result in a trait is called a GENE.
The GENES in the cell of a diploid organism contain all the necessary instructions for building up the organism.These instructions are written on a molecular scale.. Most genes contain information to direct the synthesis of specific proteins. Each such protein takes part in the development of a particular character.
A protein is made up of one or more chains of amino acids known as polypeptides. The sequence of bases in a DNA molecule determines the type of amino acid and the sequence in which they are arranged in a polypeptide chain.
A gene therefore is a sequence of triplets of the four bases which specifies the structure of a protein
Put the following actions in order: DNA replicates, cell grows, cell divides,
cell prepares for mitosis.
DNA replicates, cell grows, cell prepares fro mitosis, cell divides
cell grows, DNA replicates, cell prepares for mitosis, cell divides
cell grows, cell prepares for mitosis, DNA replicates, cell divides
DNA replicates, cell prepares for mitosis, cell grows, cell divides
Answer:
cell grows, DNA replicates, cell prepares for mitosis, cell divides
4)
In which case will a mutation change the phenotype of the organism?
A)
If the mutation codes for the same amino acid
B)
If the mutation codes for a different amino acid, but the protein shape does
not change
If the mutation codes for a premature stop codon
D)
If the mutation occurs in an intron
Answer:
C.) If mutation codes for a premature stop codon
Explanation:
This would cause an incomplete protein
What is the function of the Turbine in a power plant using fossil fuels?
O A. To recycle the steam back into water.
B. To generate the steam to turn the generator.
OC. To burn the fossil fuels, generating heat.
OD. To spin the generator using steam.
Answer:
D
Explanation:
The function of the Turbine in a power plant using fossil fuels is to spin the generator using steam.
What is a turbine?Turbines are mechanical devices that are used to extract energy from fuel or air. These are the fans that run by the water or air and generate electricity. They are large fans and that move very fast.
Thus, the correct option is D.
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NEED HELP
In a population of cats, a gene that controls an observable trait has several different alleles. Which of the following best explains how genetic drift might affect the genetic makeup of this cat population over time?
It is a directed process, so it might cause an increase in the gene pool's allele frequencies.
It is a nonselective process, so it might cause an allele to disappear from the gene pool by chance.
It is a random process, so it might cause a population to reach genetic equilibrium.
It is a selective process, so it might cause an increase in the population's genetic variation.
Answer: It is a nonselective process, so it might cause an allele to disappear from the gene pool by chance brainliest?
Explanation:
Select all true statements
Answer:
where is the question of this picture?
Neurons make up the communication network in your body called ______
Answer:
Nerve Cells
Explanation:
can someone tell me if this is right plzz
Answer:
Maybe but double check
Explanation:
At Weeks Bay there was a population of 200 alligators. In May of 2006 a new species of catfish was released into the Mississippi. These catfish reproduce very fast and soon become a rich food source for the alligator population. This provides the alligators with the energy needed for more successful reproduction. The following summer of 2007, 100 babies were born and a total of 40 gators died that year. However, the next year in early 2008 there was a terrible drought, causing 100 alligators to die.
1. What was the population size of alligators during the summer of 2007?
WILL MARK BRAINLY
Answer:
1. 260
2.
3. drought
4. babies born
6. carrying capacity
7. population density
8. logistic growth
9. exponential curve
Explanation:
Which adaptation to a dry climate most helps the elephant tree continue to grow by reducing the loss of moisture?
A
a deep root system
B
loss of leaves during a drought
C
photosynthesis in the bark
D
closing of stomata in daylight
a - a deep root system
The closing of stomata in daylight is an adaptation to a dry climate most helps the elephant tree continue to grow by reducing the loss of moisture (Option D).
What is an adaptation?An adaptation is a phenotypic feature that allows an organism to survive in particular environmental conditions.
Stomata are structures in plants that allow the interchange of gases required during photosynthesis.The closing of stomata represents an adaptation to arid conditions because it avoids water loss.In conclusion, the closing of stomata in daylight is an adaptation to a dry climate most helps the elephant tree continue to grow by reducing the loss of moisture (Option D).
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I need helo with one please help and if you can do number 2 that would be good please help
Answer:
1.
✔Deep sea trenches
✔Mountains
✔Faults
2.
B. It is an ancient supercontinent
Explanation:
The above answers are correct.
The convergent plate boundary is known to be an area on Earth where subduction occurs. It is a place where two or more lithospheric plates collide. This convergent plate boundary is characterized by deep ocean trenches, island arcs, mountain ranges, faults and volcanoes.
Pangaea is known to be a supercontinent that actually incorporated almost all the earth's landmasses and it is said to have existed during the late Paleozoic and early Mesozoic eras. It is revealed that over 150 million years the supercontinent began to break apart.
In multicellular organisms, tissues are comprised of
a systems
b organs
c cells
d blood
Answer: B organs
Explanation:
What biome is Alabama in
Answer:
Deciduous forest biome
Explanation:
Deciduous forests are found in the following states in the U.S: Florida, Georgia, South Carolina, Alabama, Virginia, parts of Texas and Tennessee. Among the countries in Europe that have Deciduous forest biome include Italy, Spain, France, Bulgaria, Poland and much more.
Miss Emily's hometown in Alabama is the town in which William Faulkner's story "A Rose for Emily" is set, while Woodstock is a small community in Bibb County, Alabama. Despite the fact that the two places are distinct, there are a few similarities between them.
First and foremost, both towns are situated in Alabama, which means that they share a geographic location. Both towns are in the Deep South, a region known for its sultry climate, and both are located in rural areas. This implies that the two towns are exposed to comparable weather patterns and experience similar seasons throughout the year.
Second, both towns have a rich history, which is reflected in their architecture and cultural traditions. For example, Miss Emily's hometown has a beautiful but decaying old Southern mansion, which is symbolic of the town's former glory. Similarly, Woodstock, like many other small towns in the region, has numerous old homes and buildings that are over a century old.
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HELPP, 30 PTS!
Use the 5 bases provided to show how nitrogenous bases are sequenced or matched in both DNA and RNA
ADENINE, THYMINE, URACIL, GUANINE, and CYTOSINE
Answer:
Adenine sorry if I am wrong
Help with this pls I'm very counfused and it's due in 1 hours. 
Answer:
OH HELL NAW NOT A WHOLE LONG ASH QUESTION PAGE
Explanation:
Answer:
Explanation:
How much marks will you give for this????
What is the key to most Al challenges?
Answer
In a general term, AI refers to computational tool that are able to substitute for human intelligence in the performance of certain tasks. This technology is currently advancing at the breakneck pace, much like exponential growth experienced by database technology in the late twentieth century. Databases have grown to become the core infrastructure that drives enterprise-level software over the coming decades is expected to be driven, at least in part, by AI
Explanation:
Due to its location, Hawaii does not have very many land birds. The Hawaiian honeycreepers are a favorite for many ornithologists. There are over 50 species of honeycreepers that can all be traced back to one ancestor. The level of diversity in an ecosystem can be determined by the frequency of speciation and extinction.
a) Describe speciation and identify two possible prezygotic barriers of the Hawaiian honeycreepers that contribute to speciation.
b) If the Hawaiian honeycreepers became extinct, explain how the newly available niches could lead to speciation.
Answer:
In speciation, organisms evolved with the passage of time.
Explanation:
Speciation is the evolutionary process in which populations of species evolve with the passage of time to become different species from the original one. Temporal isolation and gametic isolation are two possible prezygotic barriers of the Hawaiian honeycreepers that contribute to occur speciation. The newly available niches could lead to speciation of that organisms that tolerate the Hawaiian climatic conditions when the extinction of Hawaiian honeycreepers occurs. The new organisms used the available resources such as food and space etc and increase its population.
A denisty of a bottle weighs 0.25N when empty & 0.75N when filled with water & 0.65N when filled with alcohol. Calculate;. 1) the volume of the bottle 2) the denisty of the alcohol (denisty of water is 1000kg/m & g is 10m
Answer:
[tex]0.05\times 10^{-3}\ \text{m}^3[/tex]
[tex]800\ \text{kg/m}^3[/tex]
Explanation:
[tex]W_b[/tex] = Weight of bottle = 0.25 N
[tex]W_w[/tex] = Weight of water = [tex]0.75-0.25=0.5\ \text{N}[/tex]
g = Acceleration due to gravity = [tex]10\ \text{m/s}^2[/tex]
[tex]\rho_w[/tex] = Density of water = [tex]1000\ \text{kg/m}^3[/tex]
Mass of water
[tex]m_w=\dfrac{W_w}{g}\\\Rightarrow m_w=\dfrac{0.5}{10}\\\Rightarrow m_w=0.05\ \text{kg}[/tex]
Volume is given by
[tex]V_w=\dfrac{m_w}{\rho_w}\\\Rightarrow V_w=\dfrac{0.05}{1000}\\\Rightarrow V_w=0.05\times 10^{-3}\ \text{m}^3[/tex]
Volume of the bottle is [tex]0.05\times 10^{-3}\ \text{m}^3[/tex].
This means that the alcohol will take the same amount of volume.
[tex]W_a[/tex] = Weight of alcohol = [tex]0.65-0.25=0.4\ \text{N}[/tex]
Mass of alcohol
[tex]m_a=\dfrac{0.4}{10}\\\Rightarrow m_a=0.04\ \text{kg}[/tex]
Density is given by
[tex]\rho=\dfrac{m_a}{V_w}\\\Rightarrow \rho=\dfrac{0.04}{0.05\times 10^{-3}}\\\Rightarrow \rho=800\ \text{kg/m}^3[/tex]
Density of alcohol is [tex]800\ \text{kg/m}^3[/tex]
The volume of the bottle is 50 mL and the density of alcohol is 0.8 g/c[tex]m^{3}[/tex]
The weight of empty bottle is 0.25N
the weight of bottle filled with water is 0.75N
therefore, the weight of water in the bottle is 0.75N - 0.25N = 0.50N
we know that weight, w =mg , where m is the mass of substance and g is acceleration due to gravity. Here we will take g= 10 m/[tex]s^{2}[/tex] for simplicity.
⇒ m = w/g = 0.5/10 = 0.05 kg
⇒ mass of water is 50g
now, the density of water ρ(w) = 1g/[tex]cm^{3}[/tex] = 1g/mL
relation between mass, density and volume is:
V = m/ρ = 50/1 = 50mL
Hence the volume of the bottle is 50mL.
Now it is given that the weight of bottle filled with alcohol is 0.65N
⇒ weight of alcohol = 0.40N
⇒ mass of alcohol = 0.40/g = 0.40/10 = 0.040kg = 40g
The volume of the bottle remains the same, so to calculate the density of alcohol we use the above mentioned relation between mass, density, and volume on alcohol.
That is, V = m/ρ
⇒ ρ(al) = m/V = 40/50 g/c[tex]m^{3}[/tex]
ρ(al) = 0.8 g/c[tex]m^{3}[/tex] or 0.8 g/mL
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