A zygote whose genotype is XX will develop as a
A) male.
B) female.
Answer: B
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Most antigens to which B cells respond are:
a. B-dependent antigens b. T-dependent antigens c. B antibodies d. T antibodies e. T cells
If the pacemaker cells in the SA node become more permeable to potassium ions,
A) the heart rate will increase. B) the heart rate will decrease. C) the membrane will depolarize. D) the membrane will hyperpolarize. E) both heart rate will decrease and membrane will hyperpolarize.
Many muscles are named for their location (origin and insertion) in the body, particularly in relation to bones. In what body region would you expect the frontalis muscle to originate?
A. The abdominal region B. The cranium C. The pelvic region D. The thoracic region
Identical alleles are said to be
A. heterozygous. B. homozygous. C. recessive. D. dominant.