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Insulin, antibodies, enzymes and progesterone are four of many molecules found in and around cells. Of these four__________ are/is not a protein. (Points: 4)
a. antibodies
b. insulin and antibodies
c. antibodies and progesterone
d. progesterone


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Go to the following site and read about the chemistry of progesterone and then ask yourself if it is a protein.

http://en.wikipedia.org/wiki/Progesterone

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