What is the major assumption of the exponential model of population growth?
a. resources are unlimited
b. organisms selectively choose their mates
c. the death rate equals the birth rate
d. biotic potential is limited
e. density-dependent factors are at work
ANSWER: a
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Which method of animal cell infection is used by enveloped viruses, but not non-enveloped viruses?
a. receptor-mediated endocytosis b. membrane-channel injection c. fusion d. diffusion
In muscle tissue, if there is not enough oxygen for aerobic respiration to occur, the muscle cell
A. can produce ATP by fermentation. B. cannot make ATP. C. uses creatine phosphate instead of ATP for energy. D. can produce ATP from fats. E. depletes its reserves of lactic acid.
Four of these statements about master genes are true. Which statement is not true?
a. They orchestrate layers of development. b. They are highly conserved over evolutionary time. c. Mutations within these are frequently devastating. d. They are highly variable in their sequences between species. e. Mutations usually result in changes in body plan.
Which of the following is common to both factor-dependent and factor-independent transcription termination?
A. Both types of termination are associated with rho termination factor. B. Both types of termination involve NusA protein. C. Both types of termination occur following a pause by the polymerase. D. None of the choices are correct.