A person with swollen gums rinses his mouth with warm salt water, and the swelling decreases. Which has occurred?
The swollen gums have absorbed the saltwater solution.
The saltwater solution lowers the temperature of the water in the gums.
The salt in the solution has moved against the concentration gradient.
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 positive test for proteins
a positive test for starches
a negative test for proteins
a negative test for starches
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