Who discovered that DNA was the genetic material or transforming factor that could convert nonvirulent R-type Streptococcus pneumoniae bacterium to the virulent S-type?
A. Hershey and Chase
B. Weismann and Nageli
C. Avery, MacLeod, and McCarty
D. Watson, Crick, Wilkins, and Franklin
E. Griffith
Answer: C
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The main route of transmission of the poliovirus is ________.
A. body contact B. respiratory secretions C. food and water D. fomites
One benefit of sexual reproduction over asexual reproduction is that:a
more offspring can be produced. b. the offspring are all identical to the parents. c. the interaction of the genes from both parents brings about genetic variation. d. evolution will occur at a slower rate when there are two parents. e. there is less variation from generation to generation.
Mammals are different from birds in all these characteristics EXCEPT
A. mammary glands. B. constant body temperature. C. hair. D. young born alive.
Complementary base pairs are held together by
A) disulfide bonds. B) peptide bonds. C) covalent bonds. D) hydrogen bonds. E) ionic bonds.