. Which cell feature is absent in bacterial cells?
a. plasma membrane
b. nucleoid
c. cytoplasm
d. nucleus
e. DNA
Answer: d
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The change in the chromosomes depicted between the top and the bottom in the accompanying figure represents a(n)
a. inversion b. duplication c. reciprocal translocation d. deletion e. Philadelphia chromosome
System cell biologists often work with _______ to develop models of cellular processes that can be
refined by experimental validation.
a. molecular biologists b. reduction scientists c. the membrane d. mathmaticians e. mathmaticians and computer scientists
The female part of a flower is known as the ____
a. stamen b. anther c. carpel d. megaspore e. endosperm
Which of the following statements is true concerning
Streptococcus pneumoniae? a. About half of known strains are resistant. b. It can cause meningitis and ear infections. c. Crowding helps it spread. d. Resistance arises by horizontal gene transfers. e. All of these are true.