Which is true of selective IgA deficiency?
A. It is invariably fatal.
B. It is very rare.
C. It mainly occurs in older adults.
D. Patients may develop an anti-IgA antibody.
Ans: D. Patients may develop an anti-IgA antibody.
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In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone. Why?
A. Individuals with two normal alleles have an advantage over heterozygous individuals. B. Individuals with two harmful alleles have an advantage over heterozygous individuals. C. Individuals with two harmful alleles have an advantage over individuals with two normal alleles. D. Heterozygous individuals have an advantage over individuals with two normal alleles.
Which of the following contributes to the removal of organic material in home sewage treatment system leach fields?
A. Entrapment of microbes B. Adsorption of organic material C. Aerobic digestion D. All of these choices are correct.
The greatest diversity of animals is found in the
A. tropical rainforest. B. boreal coniferous forest. C. tundra. D. temperate deciduous forest.
The cortical reaction of sea urchin eggs functions directly in _____
A) the formation of a fertilization envelope B) the production of a fast block to polyspermy C) the release of hydrolytic enzymes from the sperm D) the generation of an electrical impulse by the egg