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$4.$ The primary function of vitamin $C$ is to

A$.$ synthesize protein.

B$.$ act as a coenzyme.

C$.$ act as an antioxidant.

D$.$ enable blood clotting.

$5.$ What substance can bind calcium and make it unavailable for absorption$?$

A$.$ purine

B$.$ tocopherol

C$.$ oxalate

D$.$ manganese

$6.$ What is a good source of vitamin B$12?$

A$.$ corn

B$.$ rice

C$.$ tofu

D$.$ meat

$7.$ Which mineral performs functions that include blood$-$pressure regulation, muscle contraction, and nerve transmission?

A$.$ calcium

B$.$ fluoride

C$.$ manganese

D$.$ phosphorus

$8.$ The primary function of water in the body is to

A$.$ synthesize collagen.

B$.$ release free radicals.

C$.$ maintain body temperature.

D$.$ act as a coenzyme for energy metabolism.