Sperm pass through several stages during their development. The earliest stage in which the cell becomes haploid isthe:a
sperm.
b. spermatid.
c. primary spermatocyte.
d. secondary spermatocyte.
e. spermatogonium.
d
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Like other members of their phylum, jellyfishes have specialized stinging cells called ____ as part of
their epidermis, which they use to paralyze small prey.
a. choanocytes b. polyps c. cnidocytes d. flame cells e. tentacles
Which molecule is INCORRECTLY matched
with its component part?
a. fat: fatty acid. b. starch: glycerol. c. protein: amino acid. d. glycogen: glucose. e. nucleic acids: nucleotide
Research on conditions that are relatively new to human populations such as myopia, breast cancer, and obesity support the conclusion that ________
A) human populations have accumulated a number of mutations that have become fixed by genetic drift B) the changes in human lifestyle account for all of the increase in frequencies of these conditions C) these conditions are indeed "diseases of civilization" and are likely caused by the interaction between genes (genetic susceptibility) and novel environments D) these human conditions are mere artifacts of the way in which they have been evaluated
The receptors for steroid hormones lie
A. within the cell membrane. B. in the glycocalyx of the cell membrane. C. in the endoplasmic reticulum of the cell. D. in the cytoplasm.