Sperm lack a(n) ________.
A. nucleus
B. mitochondria
C. endoplasmic reticulum
D. flagellum
Answer: C
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What type of circuit is used to maintain body posture while walking?
A. Reverberating B. Converging C. Diverging D. Parallel-after-discharge E. None of the choices is correct.
Which is not considered to be a symptom of menopause?
A. Periodic elevations in body temperature B. Increase in the amount of facial hair C. Vaginal dryness D. Osteoporosis E. No exceptions; all choices are considered to be symptoms of menopause.
John is a sprinter who specializes in quick and powerful bursts of speed followed by periods of rest. Jim is a marathon runner who specializes in long, steady runs. Compared to Jim, John is likely to have:
A. legs with a larger diameter. B. legs with a smaller diameter. C. hypertrophy of type I muscle fibers. D. a higher density of capillaries in his legs. E. lower concentrations of glycolytic enzymes in his leg muscles.
Erythropoietin is a hormone produced by the ________ to increase the rate of production and maturation of erythrocyte progenitor and erythroblast cells.
Fill in the blank(s) with the appropriate word(s).