Contact inhibition is an important mechanism for maintaining cell growth in developed organs and tissues. Suppose the organ and tissue cells remain in contact with each other. In order to prevent the cells from dividing, which phase of the cell cycle must they be in?
a. in G1
b. in G0
c. in G2
d. in prophase
Answer: b. in G0
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Which region of the brain is associated with decision-making, speech, and maintaining attention?
a. The temporal lobe b. The parietal lobe c. The occipital lobe d. The frontal lobe
In addition to inhibiting the transpeptidation reaction in cell wall synthesis, penicillins may also destroy bacteria by ________.
A. inhibiting protein synthesis B. inhibiting DNA replication C. stimulating proteins to form holes in the plasma membrane D. None of the choices are correct.
Which term describes a set of organisms that descended from a single common ancestor and are more closely related to other members of the group than to organisms outside the group?
A) paraphyletic group B) phylogeny C) species D) monophyletic group E) parsimony
A phospholipid has ________ fatty acids attached to glycerol, whereas a fat has ________.
A. 2; 4 B. 2; 3 C. 3; 4 D. 4; 2 E. 3; 2