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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

Which of the following is NOT among the characteristics associated with Type-A personality?

A. Time urgency B. Patience C. Competition D. Hostility

Biology & Microbiology