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RELEASED

A person with swollen gums rinses his mouth with warm salt water, and the swelling decreases. Which has occurred?

A

The swollen gums have absorbed the saltwater solution.

B

The saltwater solution lowers the temperature of the water in the gums.

C

The salt in the solution has moved against the concentration gradient.

D

The water in the gums has moved from a high to a low concentration of water.

North Carolina Test of Biology. Form I RELEASED Fall 2009

An iodine solution is placed on the cut side of a potato. Within seconds, a blue-black color appears. What is most likely occurring?

A

a positive test for proteins

B

a positive test for starches

C

a negative test for proteins

D

a negative test for starches

NCDPI

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