Conservation of amino acid sequence among distantly related groups of organisms is suggestive of a(n) ________
A) intrinsic resistance to mutations in that sequence
B) lack of common ancestor
C) lack of selective pressure on that sequence
D) important function for that sequence
Answer: D
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If a mutation occurred in a flatworm such that the flame cells no longer functioned, what do you predict would be the consequence?
A. The parasitic forms could no longer hold onto their host. B. Excretory function would be impaired. C. Digestive function would be impaired. D. Nerve function would be impaired. E. Reproductive function would be impaired.
Uracil can pair with
a. ribose. b. adenine. c. cytosine. d. thymine. e. guanine.
Most species produce large numbers of offspring by sexual reproduction. This is important to the theory of natural selection because
A. each individual is unique and this diversity allows selecting agents to operate. B. selecting agents often lead to the death of large numbers of offspring. C. the diversity shown in the offspring makes it highly likely that some of them will be able to reproduce successfully. D. All of the choices are correct.
©McGraw-Hill EducationBased on the phylogeny shown, the outgroup would be species
A. 1. B. 2. C. 3. D. 4. E. 5.