Which of the following statements about spermatogenesis is false?
A. Sperm are motile as soon as they are
produced.
B. Secondary spermatocytes and spermatids
are linked together by cytoplasmic bridges.
C. Spermatogenesis takes 2–3 months.
D. Sperm are produced continuously within
the seminiferous tubules.
E. None of the answer options is false.
A
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Atmospheric carbon dioxide levels ____
a. drop in the winter b. drop in the spring c. drop in the summer d. drop in the fall e. always remain constant
Match the term on the left with its definition or description on the right
A) light-dependent generation of NADPH B) electron donors such as sulfide and thiosulfate C) electron donor is water D) energy from sunlight, carbon from organic sources E) energy from carbon, carbon from sunlight F) electron donor is carbon dioxide G) energy from sunlight, carbon from CO2 1) photoreduction 2) photoheterotrophs 3) photoautotrophs 4) oxygenic phototrophs 5) anoxygenic phototrophs
The major difference between a structural lipid, such as those in cell membranes, and a storage fat is
the fact that the structural lipid:a. most commonly contains phosphate. b. does not contain glycerol. c. has four fatty acids attached to glucose. d. is entirely hydrophobic. e. is nonpolar
Chloramphenicol, a bacteriostatic antimicrobial agent, is an inhibitor of:
A) nucleic acid synthesis B) cell wall synthesis C) cell membrane function D) protein synthesis