Enzymes
a. control the speed of a reaction.
b. change shapes to facilitate certain reactions.
c. may place physical stress on the bonds of
the substrate.
d. always work on their own.
e. do all of these.
D
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A substance that resists or minimizes changes in pH when an acid or base is added to a solution is ________.
Fill in the blank(s) with the appropriate word(s).
Penicillin works most effectively against gram-positive bacteria because:a
penicillin affects cell membranes. b. they have a thick peptidoglycan cell wall, and penicillin affects the synthesis of peptidoglycans. c. they have special protein channels that allow penicillin to enter the cell and halt the cell cycle. d. they are smaller than gram-negative bacteria and, thus, easily take up penicillin by diffusion. e. they contain prophages that negatively interact with penicillin.
What is the name of the membranous structure that compartmentalizes the cytoplasm of eukaryotic organisms?
A) ribosome B) mitochondria C) nucleoid D) cytosol E) endoplasmic reticulum
Which is the correct order of hormone secretion in response to inflammation?
A. The hypothalamus stimulates the anterior pituitary to produce ANH which causes the adrenal cortex to secrete cortisol. B. The hypothalamus stimulates the anterior pituitary to produce ACTH which causes the adrenal cortex to secrete aldosterone. C. The anterior pituitary stimulates the hypothalamus to produce ACTH which causes the adrenal cortex to secrete cortisol. D. The hypothalamus stimulates the anterior pituitary to produce ANH which causes the adrenal cortex to secrete aldosterone. E. The hypothalamus stimulates the anterior pituitary to produce ACTH which causes the adrenal cortex to secrete cortisol.