As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. insertion
B. transition
C. frameshift
D. transversion
Answer: B
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________ is a chemical message sent by another individual.
a. Pheromone
b. Proprioception
c. Thermoception
d. Phenome
A taste bud is made up of:
A. chemoreceptors. B. thermoreceptors. C. mechanoreceptors. D. gustoreceptors.
Which of the following may be used by prokaryotes, under anaerobic conditions, as terminal electron acceptors?
A. nitrate B. nitrite C. sulfate D. carbon dioxide E. All of the choices are correct.
Which of the following is not true of the punctuated equilibrium theory?
a. It was inspired in part by patterns observed in the fossil record. b. It proposes that most evolutionary change is concentrated in relatively brief episodes of change. c. It suggests that subgroups diverge and evolve at about equal and constant rates. d. It suggests that most species undergo little phenotypic change during most of their evolutionary duration. e. It appears to be well supported by the fossil record.