A species that three sets of homologous chromosomes can have ________ different combinations of chromosomes in its gametes.
A. 6
B. 27
C. 8
D. 64
E. 3
Answer: C
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A muscle fiber contracts by a sequence of events initiated by the binding of acetylcholine to its receptor. Which of the following is the correct sequence?I - The calcium-troponin complex pulls tropomyosin away from the myosin-binding sites of actin.II - The freed-sites of actin bind to myosin to form cross-bridges.III - Calcium ion binds to the troponin.
A. I, II, and III B. III, II, and I C. I, III, and II D. II, III, and I E. III, I, and II
Which bird is a social parasite and lays its eggs
in the nests of other birds? a. catbird b. cowbird c. magpie d. Kirtland warbler e. blue jay
Four of the five answers listed below describe changes at the chromosomal level. Select the exception
a. base substitution b. duplication c. translocation d. deletion e. inversion
Mutations that may confer no apparent selective advantage in a particular environment are referred toas:a
natural mutations. b. equilibrium mutations. c. selective variations. d. variable mutations. e. neutral variations.