Answer:
B Plasmids are circular, double-stranded DNA molecules that provide genes that may aid in survival of the prokaryotic cell.
Explanation:
Plasmids would be additional chromosomal, double stranded also it is covalently that are closed and circular DNA molecules. It possesses genes that represent some unique attributes to the prokaryotic cell like fertility factor, F plasmid, etc. It may existed as an independent entity that should be within the cell or may be they integrate within the host genome this we called as an episomal in nature
In addition to this, Plasmids plays a significant role in the gene transfer i.e. horizontal that should be within the prokaryotes and are widely used in the recombinant DNA technology like vectors
Therefore, the option b is correct
Plasmids are the extrachromosomal material present in prokaryotic cells that divides independently. They are circular and aids in the survival of prokaryotic organisms.
What are plasmids?Plasmids are the extra genetic material that is double-stranded and circular found along with the nucleoid in the cytoplasm of the prokaryotic cell. They are majorly used in the genetic engineering process.
They provide protection and antibiotic resistance in the prokaryotes like bacteria as they carry antibiotic degrading genes and enzymes. They are capable of producing enzymes that can degrade antibiotics by cleaving them.
Therefore, option B. plasmids are double-stranded molecules that confer protection to prokaryotic cells.
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(ii)
Which process transfers energy from organisms at one stage in a food chain
to organisms at the next?
Tick the correct box.
reproduction
feeding
movement
photosynthesis
1 mark
Answer:
feeding
Explanation:
when an organism eats another, it gets energy from it. That energy is passed along the food chain
The process by which energy is transferred from organisms at one stage in a food chain to organisms at the next is by feeding, which is present in the second option, as through the eating process and the predator-prey relationship, energies pass.
What is the significance of the food chain and the energy transfer?The food chain in nature is made up of many trophic levels, where one trophic level animal preys on other animals or plants and obtains food from them, so when the animal is eaten by other animals, the energy content passes from one to another, and the energy content from plants continues to decrease to the topmost trophic levels.
Hence, the process by which energy is transferred from organisms at one stage in a food chain to organisms at the next is by feeding, which is present in the second option, as through the eating process and the predator-prey relationship, energies pass.
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Name two producers in the food web
under what conditions can carrying capacity for a population reach equilibrium
Answer:When food, water, and space used by a population stay stable over time.
Explanation:
Which of the following is the best example of a point source of water
pollution?
a. Storm water
b. Agricultural Runoff
c. Factory effluent
d. Residential posticide runoff
The BEST example of a point source of water pollution is factory effluent (Option c).
Water pollution refers to the contamination of water with pollutants. These substances (i.e., pollutants) convert water unusable to carry out different activities (e.g., drinking, cleaning, etc).
Water pollutants include, among others, herbicides, food processing waste, volatile compounds, heavy metals, organic pollutant microorganisms (e.g. bacteria, parasites), etc.
Factory effluents are well known to be harmful water pollutants for aquatic ecosystems.
In conclusion, the BEST example of a point source of water pollution is factory effluent (Option c).
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which of the following is NOT a natural resource?
gold
water
oil
fire
Answer:
fire is your answer i hope this helps
Pls help with this question (I will mark brainliest)
Answer:
B. Mental, Protien
Explanation:
I so sorry if I'm wrong
How did mammals survive the mass extinction?
A. By living underground
B. By having a less selective diet
C. Both of the above
Answer:
C. Both of the above.........
B) By having a less selective diet if I'm not wrong
Which group of pictures best represents a population?
А.
В.
C.
D
Answer:
C
Explanation:
because a population is a group of the same species that lives in a given area
(Will give brainly, 50 total points!)
1.Why does menstruation begin?
2.How long does the menstrual cycle usually last?
3.How do you know when the first day of the menstrual cycle is? What happens?
4.What is the function of FSH?
5.What are the small sacs in an ovary that contain a developing egg cell?
6.When does a woman run out of eggs? (No longer able to conceive) What is this point 7.in a woman's life called?
8.What is the name of the lining of the uterus?
9.What does estrogen do to the lining of the uterus?
10.What hormone is released due to the rising level of estrogen in the bloodstream?
11.What is the process by which the egg is released called?
12.When does ovulation occur? (At what point in the cycle?)
13.What is the maximum life of a sperm?
14.What hormone prevents the release of another egg?
15.What happens to hormone levels if a woman becomes pregnant?
16.Why does menstruation begin?
17.How long does the menstrual cycle usually last?
18.How do you know when the first day of the menstrual cycle is? What happens?
19.What is the function of FSH?
20.What are the small sacs in an ovary that contain a developing egg cell?
21.When does a woman run out of eggs? (No longer able to conceive) What is this point in a woman's life called?
22.What is the name of the lining of the uterus?
23.What does estrogen do to the lining of the uterus?
24.What hormone is released due to the rising level of estrogen in the bloodstream?
25.What is the process by which the egg is released called?
26.When does ovulation occur? (At what point in the cycle?)
27.What is the maximum life of a sperm?
28What hormone prevents the release of another egg?
29.What happens to hormone levels if a woman becomes pregnant?
Answer:
1.) Why does menstruation begin?
A.) Period happens because of changes in hormones in the body.
2.) How long does the menstrual cycle usually last?
A.) the menstrual cycle lasts 21 to 35 days while bleeding between 2 to 7 days
3.) How do you know when the first day of the menstrual cycle is? What happens?
A.) first day of menstrual bleeding is considered Day 1 of the cycle.
4.) What is the function of FSH?
A.) FSH helps control the menstrual cycle and stimulates the growth of eggs in the ovaries.
5.) What are the small sacs in an ovary that contain a developing egg cell?
A.) Follicle
6.) When does a woman run out of eggs?
A.) your ovaries cease to make estrogen, and you will go through the menopause. At the age of 45 to 50
7.) In a woman's life called?
A.) Middle adulthood is considered that period of time between ages 40 and 59
8.) What is the name of the lining of the uterus?
A.) Endometrium
9.) What does estrogen do to the lining of the uterus?
A.) Estrogen causes further proliferation of the stromal cells of the epithelial lining of the uterus.
10.) What hormone is released due to the rising level of estrogen in the bloodstream?
A.) When the level of estrogen is sufficiently high, it produces a sudden release of LH, usually around day thirteen of the cycle.
11.) What is the process by which the egg is released called?
A.) Ovulation
12.) When does ovulation occur?
A.) Ovulation typically occurs about 14 days before the start of the next menstrual period.
13.) What is the maximum life of a sperm?
A.) 5 days.
14.) What hormone prevents the release of another egg?
A.) Luteinizing hormone (LH),
15.) What happens to hormone levels if a woman becomes pregnant?
A.) Estrogen and progesterone are the chief pregnancy hormones.
16.) Why does menstruation begin?
A.) Period happens because of changes in hormones in the body.
17.) How long does the menstrual cycle usually last?
A.) the menstrual cycle lasts 21 to 35 days while bleeding between 2 to 7 days
18.) How do you know when the first day of the menstrual cycle is? What happens?
A.) first day of menstrual bleeding is considered Day 1 of the cycle.
19.) What is the function of FSH?
A.) FSH helps control the menstrual cycle and stimulates the growth of eggs in the ovaries.
20.) What are the small sacs in an ovary that contain a developing egg cell?
A.) Follicle
21.) When does a woman run out of eggs?
A.) your ovaries cease to make estrogen, and you will go through the menopause. At the age of 45 to 50
22.) What is the name of the lining of the uterus?
A.) Endometrium
23.) What does estrogen do to the lining of the uterus?
A.) estrogen causes further proliferation of the stromal cells of the epithelial lining of the uterus.
24.) What hormone is released due to the rising level of estrogen in the bloodstream?
A.) When the level of estrogen is sufficiently high, it produces a sudden release of LH, usually around day thirteen of the cycle.
25.) What is the process by which the egg is released called?
A.) Ovulation
26.) When does ovulation occur?
A.) Ovulation typically occurs about 14 days before the start of the next menstrual period.
27.) What is the maximum life of a sperm?
A.) 5 days.
28.) What hormone prevents the release of another egg?
A.) Luteinizing hormone (LH),
29.) What happens to hormone levels if a woman becomes pregnant?
A.) Estrogen and progesterone are the chief pregnancy hormones.
-TheUnknownScientist
Explanation:
I understand but it's so low point.....
.
Which of the following are benefits of commensalism? (Choose all that apply) (Don’t put links or I will report!!)
A)food
B)transportation
C)protection
D)reproduction
Answer:
the answer is A, B, C.
Explanation:
I got it right on my test.
How do biotic and abiotic factors affect the characteristics of an ecosystem
Explanation:
Biotic factors such as the presence of autotrophs or self-nourishing organisms such as plants, and the diversity of consumers also affect an entire ecosystem. Abiotic factors affect the ability of organisms to survive and reproduce. Abiotic limiting factors restrict the growth of populations.
How does carbon move from the nonliving (abiotic) environment into the living (biotic) environment?
A.) fossil fuels take carbon dioxide out of the air
B.) plants take carbon dioxide from the air
C.) animals take carbon dioxide from the air
D.) carbon dioxide moves from the air into water
Plz help soon i'll mark brainliest
Answer:
b plants take carbon dioxide from the air
La función de los tejidos conductores es:
A.
Transportar gases.
B.
Conducir el proceso fotosintético
C.
Transportar agua y sales minerales.
D.
Transportar savia.
Plants are organized into cells, tissues, organs and organ systems just like animals.
A. True
B. False
Answer:
A. True
Explanation:
Hope it helps you in your learning process
Which of the following is the best representation of the limiting factors affecting the elk population in this ecosystem?
O Number of scavengers, number of wolves, number of scientists studying Yellowstone.
Number of scavengers, and harshness of winter
Number of wolves, and harshness of winter.
The elk have no limiting factors
Answer:
Number of wolves, and harshness of winter.
Explanation: I took the test
The combination of factors that is capable of limiting the population of elk in an ecosystem would be the number of wolves and the harshness of winter.
The limiting factors of a population are those factors that hinder the population of an organism from increasing unlimitedly. In other words, limiting factors hinder populations from reaching their biotic potentials.
Limiting factors can be density-dependent if they have correlations with the density of species or density-independent if they have no correlation with an organism's density.
Wolves generally prey on elks, so they limit the growth of elk's population in an ecosystem. A harsh winter will also limit the overall growth of the population of elk in an ecosystem.
Scavengers cannot be a limiting factor to elk's population because they only feed on carcasses.
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11.Explain why the newly created bacteria are considered genetically modified
Answer: Genetically modified bacteria are used to produce large amounts of proteins for industrial use. Generally the bacteria are grown to a large volume before the gene encoding the protein is activated. The bacteria are then harvested and the desired protein purified from them.
Explanation:
help? plz mark brainliest?!
Answer:
Darwin
Explanation:
He was a scientist who was all about evolution (change over time)
What does coal do to the environment
Answer:
the burning of fossil fuels releases greenhouse gases into the atmosphere, increasing levels of CO2 and other gasses, trapping heat, and contributing to global climate change. Coal combustion releases the greenhouse gases carbon dioxide (CO2) and nitrous oxide (N2O) during combustion.Explanation:
Answer: Burning fuel releases CO2 into the atmosphere these gasses are called greenhouse gasses. When enough of these gasses accumulate in the sky the earth's natural temperature increases.
The leg muscles of a sprinter would differ from a marathon runner in that ________. The leg muscles of a sprinter would differ from a marathon runner in that ________. per gram, the sprinter's muscles would have more mitochondria than the marathon runner's muscles the marathon runner's muscles would have a greater rate of contraction than the sprinter's muscles per gram, the marathon runner's muscles would contain more myoglobin than the sprinter's muscles per gram, the sprinter's muscles would use more oxygen than the marathon runner's muscles
Answer:
The correct answer is - per gram, the marathon runner's muscles would contain more myoglobin than the sprinter's muscles.
Explanation:
Marathon runners have smaller leg muscles and thinner quads and calves as marathon runners require slow-twitch muscles while in sprinters the fast-twitch muscle requires. Slow-twitch muscles of marathon runners have more amount of myoglobin, per gram than fast-twitch muscles.
Myoglobin acts as local oxygen storage that provides oxygen to the muscles in case of less oxygen supply than required temporarily and a marathon race is an intense exercise or activity that requires more oxygen.
Which shows the best connection between the digestive and excretory systems?
The digestive system fuels the cells and the excretory system rids the body of the cells’ waste.
The digestive system rids the body of the cells’ waste and the excretory system fuels the cells.
The digestive system does physical digestion while the excretory system carries out chemical digestion.
The digestive system carries out chemical digestion while the excretory system does physical digestion.
Answer:
A. The digestive system fuels the cells and the excretory system rids the body of the cells’ waste.
Explanation:
got it right on edg quiz (see pic)
hope this helps :)
All nutrients that enter the circulation are processed by the digestive and excretory systems simultaneously, with the exception of oxygen, which is taken in by the respiratory system. The correct answer is a) The digestive system fuels the cells and the excretory system rids the body of the cells’ waste.
What is the digestive and excretory system?Nutritive substances are absorbed by the digestive system, and any that are not are expelled. By continuously purging the blood, the excretory system works in tandem to remove metabolic waste products from cells throughout the body.
The digestive system takes in the nutrients and water from the diet. All across the body, the circulatory system delivers nutrition, water, and oxygen to cells. The respiratory system, the excretory system, and the skin all remove waste from the cells.
The excretory system filters the bloodstream for nutrients and gathers unneeded components in your urine for disposal, whereas the digestive system absorbs nutrients, collects them, and then eliminates the undigested solids (feces).
Therefore, the correct answer is a).
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explain the difference between solid lines in the diagram and the dashed lines in the diagram
Answer: in an organization chart, a solid line is used to indicate the relationship between a manager and their reports. A "dotted line report" is an employee that has some level of accountability to another, but is not a direct report.
Explanation:
What is the major cause of air pollution?
Answer: Air pollution occurs when harmful or excessive quantities of substances including gases, particulates, and biological molecules are introduced into Earth's atmosphere.
Explanation: Hope this helps!!!
If the half-life of a radioactive atom is 3,500 years. How old is the substance if the parent-daughter ratio is 1:127?
Answer:
2.447 × 10⁴ years
Explanation:
Step 1: Given data
Half-life of the radioactive atom (t1/2): 3,500 yearsParent-daughter ratio ([A]/[A]₀): 1:127 (1/127)Step 2: Calculate the rate constant
Radioactive decay follows first-order kinetics. We can calculate the rate constant (k) using the following equation.
k = ln2 / (t1/2) = ln2 / 3,500 y = 1.980 × 10⁻⁴ y⁻¹
Step 3: Calculate the time elapsed (t)
For first-order kinetics, we will use the following expression.
ln ([A]/[A]₀) = -k × t
t = ln ([A]/[A]₀)/ (-k)
t = ln (1/127) / (1.980 × 10⁻⁴ y⁻¹) = 2.447 × 10⁴ y
2. The genetic material of a virus can either be_____ or ______
Answer:
RNA or DNA
Explanation:
Answer: RNA or DNA
Explanation:
The Texas blind salamander (Eurycea rathbunl) lives in the Edwards Aquifer region around San Marcos. Along with other species the salamander lives in total darkness in the underground crevices and caves of the aquifer region. The table lists some of the organisms that live in this environment and their food sources. Edwards Aquifer Cave Inhabitants Food Sources Texas blind salamander Blind shrimp Snails Amphipods Intestinal roundworm Blind shrimp, amphipods Protozoa, fungl, detritus Detritus Detritus. Texas blind salamander In an energy pyramid for these aquifer cave dwellers, which of the following would be placed at the bottom? A Snails C Protozoa B D Texas blind salamanders Blind shrimp
Answer:
The answer is Protozoa
Explanation:
Reflection Question: Explain the relationship between photosynthesis and cellular respiration. Be sure to
include the main purpose of both and where they occur inside the cell.
Plant cells use CO2 and H2O to make
A. chlorophyll
B. new cells
C. glucose
D. an ovule
Answer:
c.
Explanation:
Plants use CO2 and H2O to make glucose through photosynthesis
How might a wide variety of plants affect an ecosystem's sustainability?
A. The more types of plants there are, the more nutrients will be in the soil, increasing the ecosystem's likelihood of survival.
B. If disease strikes, only some types of plants will be affected, increasing the ecosystem's likelihood of survival.
C. The more types of plants there are, the more competition for resources will take place, decreasing the ecosystem's likelihood of survival.
D. If disease strikes, the plants will all be affected and likely die, decreasing the ecosystem's likelihood of survival.
HELP!!
Question 1 (2 points)
What is the phenotypic ratio of the F2 generation?
Answer:
9:7
Explanation:
We get the dominant phenotype in plants that have at least one dominant allele of EACH of the two genes; otherwise we get the recessive phenotype. So, the observed ratio in the F2 generation is 9:7.
So, this is your answer.
Think back to Biology class. Using the phenotypes and genotypes above, create a Punnett
square that shows the possible offspring from a blood type "O" parent and a blood type
"AB" parent.
What are the probable ratios of the phenotypes and genotypes of the kids?
Answer: 50% Ao, 50% Bo