Some cells retain the capacity to divide throughout their life cycle, whereas others do not divide in adulthood. Give
one example of each type. What will be an ideal response?
ANSWER: Cells in bone marrow continually move through the cell cycle, producing about 2 million red
blood cells each second.
Skin cells constantly divide to replace dead cells that are sloughed off the surface of the
body.
Many cells in the nervous system leave the cell cycle, enter G0, and do not divide in
adulthood.
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Which combination of nonfermenting gram-negative bacilli are oxidase positive, but do not grow on MacConkey agar within 24 to 48 hours
a. B. cepacia and Pseudomonas stutzeri b. Brevundimonas dimunuta and Pseudo-monas veronii c. P. aeruginosa and R. insidiosa d. B. vesicularis and Acidovorax facilis
Set-point theories of hunger and eating are deficient because they fail to recognize the major influences on hunger and eating of such important factors as:
(a) taste (b) learning (c) social influences (d) all of the above
Expression of a shortened skin keratin gene in place of the normal keratin gene in transgenic mice resulted in a phenotype in which mice had
a. thick skin. b. no hair. c. fragile, easily blistered skin. d. white hair. e. Both b and c
What do wax and testosterone have in common?
A) They are both proteins.
B) They are both steroids.
C) They are both lipids.
D) They are both hormones.