Nauplius, a unique kind of larva, is characteristic of
A. mites.
B. chelicerates.
C. insects.
D. crustaceans.
E. horseshoe crabs.
Answer: D
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The cytoplasmic domains of immunoglobulins and TCRs have cytoplasmic tyrosines that can be phosphorylated
Indicate whether the statement is true or false.
Recombinant DNA-based products are slow to reach the marketplace because of
A) the adverse effects of gene cloning. B) the lack of technological advances in gene cloning. C) the lack of safety involved in such methods. D) the cost and duration of research.
Growing aquatic plants and finfish species together with shared water resources is an example of ________
A) hydroponics B) polyculture C) polyploidy D) fish farming E) None of these choices
What is the reason for the prevalence of the sickle-cell allele in African populations?
A) Heterozygotes have some resistance to the parasite that causes malaria. B) Sickled cells are better able to clot blood. C) African populations tend to be at higher altitudes, and sickled cells better bind oxygen in these environments. D) Sickled cells help prevent vitamin A deficiency among African populations.