Fred Griffith’s experiments with two strains of
Streptococcus pneumoniae
a. resulted in a vaccine against bacterial
pneumonia.
b. demonstrated that rough (R) bacteria cause
pneumonia.
c. provided evidence that genetic material from one
bacterial strain can be transferred to that of
another strain.
d. demonstrated that mice can transform harmless
bacteria into pathogenic bacteria.
e. demonstrated that a harmless, smooth bacterial
strain can be transformed into a lethal, rough
bacterial strain.
Answer: c
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Which of the following chromosome combinations will produce male birds?
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XH2 + NAD+ ? X + NADH + H+. In the preceding equation, NAD+ is said to be:
a. an enzyme. b. storing two hydrogen atoms. c. reduced. d. oxidized. e. a catalyst.
A Barr body in a mammalian female cell represents:a
an inactivated oocyte. b. a polar body. c. a degenerate nucleus. d. an inactivated X chromosome. e. an inactivated Y chromosome.