What enzyme links each tRNA molecule to the correct amino acid?
a. tRNA polymerase
b. peptidyl transferase
c. aminoacyl tRNA synthetase
d. 7-methylguanosine
c. aminoacyl tRNA synthetase
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An inflammation-causing signal released by mast cells at the site of an infection is _____
A) an interferon B) lymphatic fluid C) histamine D) mucus E) sodium ions
In order to transfer gene a, b, and c to an F- cell, how long must the sex pilus be in place?
a. Less than 4 minutes. b. 10 minutes. c. 14 minutes. d. More than 8 minutes but less than 20. e. 5 minutes
The corpus callosum, which lies between the two cerebral hemispheres of the brain, is actually composed of an extensive network of
A. connective tissue. B. cell bodies. C. nerve tracts. D. blood vessels.
Which of the following is NOT among the characteristics associated with Type-A personality?
A. Time urgency B. Patience C. Competition D. Hostility