An amino acid must have which of the following properties in order to be incorporated into a polypeptide?

Proteins are combination of amino acids. When the adjoining amino acid residues are bonded by a linear chain of adjoining carboxyl and amino groups a polypeptide is formed.

Hence for the formation of peptide bond two amino acid groups are required one end is combined with alpha amino group and the other end is combined with alpha carboxyl group

Note: Peptide bonds are linked together by short chain of amino acids

Amino acids are the broken down substances which when digested provide energy to the human body for metabolism

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure

the answer to your question is b