A computer programmer complains of pain in his wrist and numbness and tingling of his fingers. He likely suffers
from ____.
a. carpal tunnel syndrome
b. osteoarthritis
c. a wrist sprain
d. a slipped disk
e. a torn muscle
ANSWER: a
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Which of the following statements is (are)
INCORRECT about ricin?
a. Ricin is a naturally occurring toxic protein. b. The use of ricin as a weapon is banned by the Geneva Convention. c. Ricin does not have an antidote. d. Ricin is obtained from the castor-oil plant. e. Ricin stops protein synthesis by blocking the activity of DNA
Which of the following is an action of ricin?
a. binding to carbohydrates on the plasma membrane b. removal of an adenine base from rRNA c. ribosome inactivation d. none of these are actions of ricin e. all of these (except d) are actions of ricin
At what point are introns removed?
1.When the DNA is replicated. 2.Before the mRNA leaves the nucleus. 3.As the mRNA is being transcribed. 4.As the mRNA is being translated.
In stabilizing selection
a. differential survival and reproduction favor the extremes of the population. b. humans are the chief factor controlling which organisms survive and reproduce. c. the intermediate type of organisms survive and reproduce. d. the characteristics of a population move in one direction or another through time. e. variability is encouraged in a population, and unusual forms are more common.