Which of the following represents the specialized DNA sequence that attaches to microtubules and allows duplicated eukaryotic chromosomes to be separated during M phase?
a. mitotic spindle
b. histone
c. telomere
d. nucleosome
e. centromere
f. centrosome
Ans: e. centromere
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What does a cell of prokaryotic type lack that differentiates it from a cell of eukaryotic type?
a. a plasma membrane b. a nucleus c. DNA d. chromosomes
Which of the following statements regarding heterotrimeric G proteins in a resting state is true?
a. GDP is bound to the ? subunit in a complex with both the ? and ? subunits. b. GDP is bound to the ? subunit in a complex with both the ? and ? subunits. c. GTP is bound to the ? subunit in a complex with both the ? and ? subunits. d. The proteins are in a complex with G protein-coupled receptors.
Dinosaurs are not alive today because they
A) evolved too quickly in response to a changing environment. B) did not possess the genetic material that beneficial mutations act on. C) did not evolve fast enough to keep up with rapid environmental change. D) evolved adaptations that were beneficial in their constant, unchanging environment.
What role do capsules and protein A play as virulence factors of Staphylococcus aureus?
A) lyse red blood cells B) protect the bacterium from phagocytosis C) protect the bacterium from neutrophils D) form blood clots E) break down blood clots