Which of the following is NOT involved in the
formation of a blood clot?
a. lymphocytes
b. fibrinogen
c. thrombin
d. fibrin
e. platelets
Answer: a
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Producing gametes that are diploid results from non-disjunction. When could the nondisjunction occur?
What will be an ideal response?
In terms of surface area for exchanges, gill filaments are analogous to the __________ in the
digestive system.
a. small intestine b. villi c. stomach d. pancreas
What accounts for the fact that polydactylism is prevalent and Tay-Sachs disease is virtually absent in one human population in the United States, while Tay-Sachs disease is prevalent and polydactylism is virtually absent in another?
a. Natural selection has promoted these differences since humans live in many different environments. b. Mutation rates differ among different loci. c. There is little gene flow between the two populations. d. The populations are small, and therefore genetic drift is a major factor in the determination of allele frequencies. e. The alleles are fixed in these populations.
Protein filaments that function in muscular contraction are
A. keratin and actin. B. myosin and collagen. C. elastin and collagen. D. actin and myosin. E. elastin and keratin.