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Tamiku [17]
3 years ago
9

Bacteria live in a variety of locations one of which is the human mouth. Which explanation supports the wide variety of bacteria

in the mouth? A. Accessibility to air cause bacteria to change form. B. Salivary glands cause mutations in populations of bacteria. C. Accessibility to nutrients makes the mouth a favorable habitat. D. Calcium in the teeth provides appropriate pH levels in the mouth.
Biology
2 answers:
podryga [215]3 years ago
6 0
The answer is C. <span> Accessibility to nutrients makes the mouth a favorable habitat.

Hope this helped. Good luck!</span>
AnnyKZ [126]3 years ago
4 0

i took the test the answer is C

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Answer:

option D is incorrect

Explanation:

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The lac operon can be regulated by two distinct methods. Which of the following statements are correct?The lac operon can be act
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Answer:

  • The lac operon can be activated by the binding of allolactose to the repressor protein, releasing it from DNA and thereby allowing for transcription to occur.
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Explanation:

Lactose operon or lac operon  (includes lacZ, lacY and lacA genes) is found in some bacteria and the products of its genes are involved in lactose metabolism. So, this operon is active (genes are transcribed) when lactose is present and glucose is absent (or at low level). The operon is regulated by the lac repressor which acts as a lactose sensor and catabolite activator protein (CAP) which acts as a glucose sensor.

When there is lactose (in the form of allolactose) lac repressor detects it and stops being repressor. This enables transcription.

CAP detects glucose (via cAMP) and activates transcription when glucose levels are low.

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