Question

Amino acids are the monomers of proteins. Each amino acid consists of a carbon atom bound to a hydrogen atom, an amino group (-NH2), a carboxyl group (-COOH), and a variable R group. Which functional group acts as an acid? A) amino group B) carboxyl group C) hydroxyl group D) phosphate group

Answer 1

In amino acids, the carboxyl group acts as an acid.

Answer: Option B

Explanation:

The molecular formula of the carboxyl group is -COOH. It is composed of one carbon atom bonded with oxygen atom and hydroxyl group.

During ionization process, it leads to the formation of two ions namely a positive ion called $H^{+}$, whereas a negative ion called $COO^{-}$. Due to the formation of $H^{+}$ ions, which is nothing but a proton, the carboxyl group present in the amino acid act as an acid.

Answer 2

Answer:

Its the R group.

Explanation:

Every amino acid has an amino group, a carboxylic acid group, and a R group which varies from one amino acid to another amino acid. The R group can also be referred as side chain. There are 20 amino acids and they are the building blocks of proteins.

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