Characteristics of the mature sperm include the ________.
A) presence of two X chromosomes in approximately half the sperm
B) presence of Y chromosomes in approximately half the sperm
C) absence of an acrosome
D) absence of coiled mitochondria
B) presence of Y chromosomes in approximately half the sperm
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A. Mesencephalon B. Cerebral cortex C. Pons D. Lateral horns of the S1 spinal cord segment E. Lateral horns of the T1 spinal cord segment
A. III B. V C. VII D. IX E. X
The structures in the nucleus that serve as a "mitotic clock" are
A. hormones.
B. ribosomes.
C. telomeres.
D. kinases.
Which of the following fatty acid chains has the most double bonds?
A) polyunsaturated fatty acid B) saturated fatty acid C) glycerol D) monounsaturated fatty acid
Which of the following is NOT a B cell problem in aging?
A. Clones fail to form. B. Antibodies attack self cells. C. Antibodies do not function well. D. Incidence of cancer increases.