The vesicles that are anchored to the plasma membrane at a nerve cell presynaptic site are specialized for
A) constitutive secretion.
B) regulated secretion.
C) polarized secretion.
D) lysosome secretion.
E) endocytosis.
Answer: C
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Which of the following linkage maps correctly shows the order and distance between the px, sp, and cn genes?
Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations. The offspring are as follows:
A) sp——0.21 m.u.——px——30.01 m.u.——cn
B) sp——30.01 m.u.——px——0.21 m.u.——cn
C) sp——0.2 m.u.——px——30 m.u.——cn
D) px——0.2 m.u.——sp——30.2 m.u.——cn
E) px——30.2 m.u.——sp——0.2 m.u.——cn
A mutualism in which two species benefit when living together but can survive when apart is referred to as a(n)
A) obligatory mutualism. B) trophic mutualism. C) dispersive mutualism. D) facultative mutualism.
If an RNA does not normally code for a protein, then
A. it is mature mRNA. B. the RNA is pre-mRNA. C. it is probably tRNA or rRNA D. the RNA is a lipid.
Which of the following is a characteristic shared by DNA and RNA polymerases?
A) efficiency of proofreading B) type of nucleotides used C) direction of polymerization D) speed E) dependence on helicase