A chromosome that has been broken and rejoined in
a reversed sequence has undergone
a. inversion.
b. deletion.
c. duplication.
d. translocation.
e. aneuploidy.
Answer: a
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In prokaryotes, the 30S pre-rRNA transcript is cleaved into:
A. two rRNAs. B. three RNAs. C. two rRNAs and tRNA. D. three RNAs and tRNA. E. multiple copies of three specific RNAs plus tRNA.
Consider a tadpole becoming a toad. You would expect to find it changing its form of nitrogenous waste from
A. ammonia to urea. B. urea to ammonia. C. uric acid to urea. D. urea to uric acid. E. uric acid to ammonia.
Which one of the following symptoms is most typical of hypertension?
A) feeling dizzy and faint B) rapid heart rate C) very slow heart rate D) loss of appetite E) most often there are no symptoms
In the lower leg, the gastrocnemius muscle bends the foot away from the knee, as in pointing one's toes. The tibialis anterior muscle flexes the foot toward the knee. These two muscles are
A) synergistic. B) homeostatic. C) mutualistic. D) antagonistic. E) cooperative.