When a spermatogonium divides, it produces one primary spermatocyte and:

A) one nurse cell. B) two secondary spermatocytes.
C) one spermatogonium. D) one spermatid.


Answer: C

Biology & Microbiology

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Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?

A. nitrogen B. oxygen C. carbon D. hydrogen E. sulfur

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The hypothesis that suggests that clay may have served as the site of polymerization of both nucleic acids and proteins that might have joined to form the first protocells was proposed by

A. Stanley Miller. B. Graham Cairns-Smith. C. Thomas Cech. D. Aleksander Oparin. E. Sidney Fox.

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Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of:

A. deductive reasoning B. a hypothesis C. inductive reasoning D. an experiment E. a theory

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DNA contains two identical polynucleotide chains

a. True b. False Indicate whether the statement is true or false

Biology & Microbiology