Which theory of virus evolution hypothesizes that viruses evolved from genetic elements such as transposons?
a. progressive hypothesis
b. regressive hypothesis
c. self-replicating hypothesis
d. endosymbiont hypothesis
c. self-replicating hypothesis
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Messenger RNA molecules contain information that is used to synthesize ___________.
A. nucleotides B. amino acids C. polypeptides D. fatty acids
The force generated by a muscle contraction depends on:
A. all of the answer options provided. B. the size of the muscle. C. the number of fibers in the muscle. D. speed of contraction. E. contraction length.
Release of cross-bridges depends most directly on
A. calcium ions. B. potassium ions. C. adenosine diphosphate. D. adenosine triphosphate. E. creatine phosphate.
Which of the following contributed to the growth in human population that began about 11,000 years ago?
a. sidestepping limiting factors b. increased carrying capacity c. all of the choices d. geographic expansion