Which of the following skin changes is not associated with growing older?
A. There is less adipose tissue in the subcutaneous layer.
B. The number of elastic fibers decreases.
C. There are fewer sweat glands for sweating to occur.
D. There is an increase in the number of oil glands.
E. Pigmented blotches appear on the skin.
Answer: D
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Ribosomes that do not anchor to the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the ER. C) have a signal/trafficking error. D) do not make the appropriate anchor protein. E) all of the above
One of the important assumptions made during the study of heritability in twins is that monozygotic twins share all their ____________________ and their ____________________
Fill in the blank(s) with correct word
Which of the following is true concerning the pathogen that causes tetanus?
a. The bacteria are airborne. b. The bacteria are spread by respiration. c. The pathogen is a virus. d. The bacteria tend to colonize wounds. e. The toxin produced by the pathogen prevents muscle contraction.
Retroviruses make ____ by the process of ____
a. RNA copies of DNA; reverse transcription b. DNA copies of RNA; reverse transcription c. genetic probes; Southern blotting d. genetic probes; Northern blotting e. telomerase; mutagenesis