Acetylcholine is a neurotransmitter released by motor neurons that causes skeletal muscle fibers to relax.

a. true
b. false


Answer: b. false

Biology & Microbiology

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Most microorganisms assimilate nitrogen as ________.

A. nitrite B. nitrate C. N2 D. hydrazine

Biology & Microbiology

Proteins function ____

a. as energy carriers b. as the ‘backbone' of the DNA molecule c. as component parts of enzymes d. in energy storage within the cell nucleus e. in transmission of genetic information

Biology & Microbiology

The light-harvesting units in the thylakoid membranes are the ________.

A. electrons B. ATP molecules C. photosystems D. ATP synthases E. grana

Biology & Microbiology

The DNA-histone complex is most analogous

to

a. a pearl necklace. b. a waterproof watch. c. a microwave oven. d. the gears on a bicycle. e. a flashlight

Biology & Microbiology