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- The carbon atom in amino acids has four elements/groups attached to it in all amino acids (except for proline).
Question 1:
The carbon atom in amino acids has four elements/groups attached to it in all amino acids (except for proline). Which of the following is not among these four?
A. Carboxyl group
B. R-group (including another hydrogen)
C. Methyl group
D. Hydrogen
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