The class of fish that "Nemo" belongs to
A) hagfish
B) osteichthyes
C) chondrichthyes
D) cartliaginous
Ans: B) osteichthyes
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The best explanation for the phenotypic differences between humans and chimps despite the great similarities in their gene-coding sequences is
A. the vast differences in exons between their genomes. B. the vast differences in the introns between their genomes. C. the "junk" DNA of humans contains important sequences not present in chimps. D. differences in gene expression between species.
Character changes in molecular sequences are generated by
a. insertions. b. deletions. c. substitutions. d. base pairing. e. insertions, deletions, and substitutions.
Predators can switch to alternative prey when a prey
species is low in abundance as is shown in a. model I. b. model II. c. model III. d. models I and III. e. all of these models.
At a neruomusclular junction involving skeletal muscle, the acetylcholine receptor is a ______ channel.
A. voltage-gated Na+ B. anion C. cation D. two of the above