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Ganezh [65]
3 years ago
11

"A person who is infected with the bacteria MM294 is instructed by a doctor to take the antibiotic used in this experiment for t

en days. The individual takes the antibiotic for only three days and then stops taking the antibiotic because he is feeling better. How does this example demonstrate how a population of bacteria can change over time?"
Biology
1 answer:
pogonyaev3 years ago
8 0

Answer:

The correct answer is - develop resistance for the antibiotic.

Explanation:

Antibiotics are the drug that are used to remove or kill the bacteria population present in an infected person or organism. However the courses of the antibiotic treatment is very crucial as incomplete treatment may result in the antibiotic population to be `more strong and develop better resistance to the antibiotic.

Exposure to the antibiotic causes the ability in bacterial population to fight with an individual if the course of treatment is not completed.

Thus, the correct answer is - develop resistance for the antibiotic.

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Which one of the following is NOT a function of sertoli cells?
zimovet [89]

Answer:

The correct answer will be option-B.

Explanation:

Sertoli cells are the large somatic cells present in the testis which helps in the formation of spermatozoa. The Sertoli cells create a suitable environment for the production and maturation of the sperms as they produce certain molecules which nourishes the sperms.

The Sertoli cells act as a barrier between the testis and blood and secrete enzymes like inhibin. They eliminate the apoptotic germ cells and also produce seminiferous fluid to nourish the sperm. They do not play any role in primary spermatocytes.

Thus, Option-B is the correct answer.

4 0
3 years ago
Give a reason why an electron microscope cannot be used to study life specumen​
lesya [120]

Explanation: Electron microscopes are the most powerful type of microscope, capable of distinguishing even individual atoms. However, these microscopes cannot be used to image living cells because the electrons destroy the samples.

5 0
3 years ago
Tumors of the parathyroid gland often result in secretion of excess parathyroid hormone. Considering the function of this hormon
Luda [366]

Answer:

Parathyroid hormone increases the level of calcium while calcitonin hormone  decreases the level of calcium in the blood.

Explanation:

Parathyroid hormone is a type of harmone which is responsible for balancing calcium in our body. When the calcium level lowers in our body, parathyroid hormone is secreted and calcium is absorbed from the bones and fullfilled the requirement of the body. If the tumor secreted calcitonin hormone instead of parathyroid hormone, the calcium level in the blood is lowered because it acts to the opposite of parathyroid hormone.

4 0
3 years ago
Which of the following is a unifying characteristic of life?
lisabon 2012 [21]

Answer:

where is option I can't see

5 0
3 years ago
6. Would there be a net flow of water in one direction in the following situations? Explain your answers.
amid [387]

Answer: There won't be a net flow of water in one direction in the situation.

Explanation: The concentration of NaCl inside the cell and its concentration outside the cell is the same. This means that there is equilibrium (a balance) between the inside environment of the cell and the outside environment of the cell. And because there is equilibrium between the two sides there will not be a net flow of water in one direction. The flow of water must be in opposite directions (inside and outside) so as to maintain a balance between the two environments.

3 0
3 years ago
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