posted by Jamshid on .
Please help with this question.
Insulin, antibodies, enzymes and progesterone are four of many molecules found in and around cells. Of these four__________ are/is not a protein.
b. insulin and antibodies
c. antibodies and progesterone
I think the answer is "A" but am not sure. please help
progesterone does not contain nitrogen: proteins are nitrogenous compounds. Antibodies are proteins.