Breaking actin-myosin bonds requires
a. ATP.
b. ADP.
c. calcium.
d. phosphorus.
e. sodium
A
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21. The volume enclosed by the plasma membrane of plant cells is often much larger than the corresponding volume in animal cells. The most reasonable explanation for this observation is that
a. plant cells are capable of having a much higher surface-to-volume ratio than animal cells. b. plant cells have a much more highly convoluted (folded) plasma membrane than animal cells. c. plant cells contain a large vacuole that reduces the volume of the cytoplasm. d. animal cells are more spherical, while plant cells are elongated. e. the basic functions of plant cells are very different from those of animal cells.
Which hormone is secreted by the adrenal cortex?
a. ADH b. renin c. angiotensin I d. angiotensin II e. aldosterone
The stem apical meristem gives rise to:
a. leaf primordia. b. lateral meristems. c. root caps. d. root hairs. e. cork cells.
When two DNA pieces cut with the same restriction enzyme are combined, sticky ends will:
A. not associate. B. associate only if they are double stranded. C. associate by covalent bonds. D. associate due to DNA ligase. E. associate by complementary base pairing and hydrogen bonds.