Prior to ejaculation, mature sperm are stored in the
A. vas deferens.
B. urethra.
C. testes.
D. epididymis.
Answer: A
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A person able to hear only high-frequency sounds would probably have which of the following structural problems in the ear?
A) The tympanum is damaged because of chronic ear infections. B) The basilar membrane is stiffened along its entire length. C) The ear ossicles are abnormally thickened. D) All of these problems could result in inability to detect low-frequency sound.
Microbial growth on the two-carbon acetate substrate invokes
A) the citric acid cycle for aerobic catabolism. B) both the citric acid and glyoxylate pathways. C) the glyoxylate pathway. D) the glyoxylate and glycolysis pathways.
Which statement about plant hormones is NOT true?
A. Responses to plant hormones may be observed in nearly any part of a plant. B. Plant hormones include at least one form that is a gas. C. Each naturally occurring hormone has a specific chemical structure. D. All known growth regulators of plants are chemicals produced naturally in plants. E. Hormones are among the principal internal regulators of plant growth.
In the ONPG and MUG test for fecal coliforms, a sample that is positive for E. coli will be
A) positive for ONPG; fluorescent in UV light. B) negative for ONPG; fluorescent in UV light. C) positive for ONPG; non-fluorescent in UV light. D) negative for ONPG; non-fluorescent in UV light.