NAD is a(n)
A. enzyme.
B. electron carrier.
C. product of photosynthesis.
D. oxygen carrier.
B. electron carrier.
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What is the role of nonhistone proteins in the nucleus?
a. to regulate nuclear envelope formation b. to facilitate nuclear transportation c. to provide additional chromosomal structure d. to disassemble the nuclear envelope e. to aid in microtubule formation during mitosis
How does a vesicle form from the cell membrane?
What will be an ideal response?
The toxin of Vibrio cholerae causes severe diarrhea because it ____
a. modifies DAG and activates a cascade of protein kinases b. activates phospholipase to produce inositol triphosphate c. decreases the cytosolic concentration of Ca++ d. modifies a G protein involved in regulating salt and water secretion e. binds with adenylyl cyclase and triggers formation of cAMP
The first hormone discovered was
a. insulin. b. gastrin. c. secretin. d. thyroxine. e. estrogen.