The central atom in an amino acid that all the groups connect to is a O A. Hydrogen
.
O B. Oxygen
• O C. Carbon
.
O D. Nitrogen

C. Carbon

Explanation:

The central atom in an amino acid that all the groups connect to is a carbon atom.

Amino acids are monomeric units of proteins. They are bifunctional in that they have an amino group and a carboxyl group. These groups are attached to a carbon atom, α-carbon, in a molecule.

This is common to all amino-acids.

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