The streamlined bodies seen in sharks, tuna, and dolphins is most likely due to
A. a recent shared common ancestor.
B. the physical properties of water.
C. different selection pressures.
D. imperfect design.
E. the need to escape fast-moving predators.
Answer: B
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If the copy number of a proto-oncogene is increased by gene duplication then the proto-oncogene has undergone
A. a missense mutation. B. gene amplification. C. a chromosomal translocation. D. retroviral insertion. E. a nonsense mutation.
What are the regions where DNA-binding proteins can make direct contact with exposed nucleotides?
What will be an ideal response?
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