Which of the following accounts for the negative control of operons?

A. Promoters
B. Repressors
C. Structural genes
D. Operators
E. Deactivators


Answer: B

Biology & Microbiology

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________ forests typically grow in the intertidal zone of tropical coasts where wave action is absent, sediments accumulate, and the muds are anoxic

Fill in the blank(s) with correct word

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The complementary base that hydrogen bonds with thymine in a DNA double helix is ________

A) uracil B) thymine C) guanine D) adenine E) cytosine

Biology & Microbiology

You have just completed final preparations for a party you are hosting this evening. With thirty minutes to spare, you collapse into a chair and prop your feet up only to realize you need to empty your bladder

What part of your nervous system is in control?

Biology & Microbiology

Which option correctly pairs an endocrine gland or hormone with an aspect of metabolism that it regulates?

A) parathyroid—stimulates the adrenal cortex to secrete glucocorticoids B) pancreas—stimulates growth of the uterine lining C) insulin—regulates blood glucose levels D) prolactin—manages blood potassium levels

Biology & Microbiology