Which of the following terms refers to the male reproductive cell at the earliest stage of spermatogenesis?
A. Spermatozoan
B. Spermatid
C. Spermatogonium
D. Spermatocyte
C. Spermatogonium
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Which of the following is required for a behavioral trait to evolve by natural selection?
A) The behavior is determined entirely by genes. B) The behavior is the same in all individuals in the population. C) An individual's reproductive success depends in part on how the behavior is performed. D) The behavior is not genetically inherited. E) An individual's phenotype is not influenced by its genotype.
Antibody molecules ____
a. are secreted by B cells and T cells b. stay attached to the B cell membrane as B cell receptors c. inactivate complement proteins d. prevent phagocytosis e. can each bind to many different antigens
Rubbing a substance on uncoated paper should reveal if it contains
a. lipid. b. carbohydrate. c. protein. d. sugar.
Refer to the accompanying figure. At which point on the graph is the population increasing exponentially?
a. A
b. B
c. C
d. D
e. There is no exponential increase on this graph.