Sperm pass through several stages during their development. The earliest stage in which the cell
becomes haploid is the:a.
sperm.
b. spermatid.
c. primary spermatocyte.
d. secondary spermatocyte.
e. spermatogonium.
D
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Which of the following is the cancer of epithelial cells?
A. sarcoma B. lymphoma C. leukemia D. carcinoma E. myoloma
When the chromosomes line up at the equatorial plane, you can conclude the cell is in
A. anaphase. B. metaphase. C. interphase. D. telophase. E. prophase.
Biology books earlier in this century assumed that the earliest protocells would have to be autotrophs. This concept appears to be
A. correct, since heterotrophs would depend upon eating autotrophs. B. correct, since life is not possible without ATP, which is only available in living systems. C. correct, since glycolysis and fermentation only occur after oxygen is present from photosynthesis. D. incorrect, since the primordial soup could contain many preformed food molecules. E. incorrect, since glycolysis and fermentation require complex enzymes for catalytic reactions.
The process of filtration can be a(n)
A. disinfectant method. B. sterilizing method. C. sanitization method. D. antiseptic procedure. E. ineffective method for removing microbes.