Which of the following correctly describes the image below? (2 points) a single hydrogen atom bonded to a central carbon atom. an amino group and a carboxylic acid group both bonded to the central carbon atom. a side chain group, represented by the variable r, is attached to the central carbon atom. select one: a. protein molecule b. rna molecule c. amino acid d. carboxylic acid

C

An amino acid has a central carbon atom surrounded by a hydrogen atom, a carboxyl group (-COOH) , an amino group(-NH2) and an alkyl group(-R).  Hence if an a molecule has a singlt hydrogen atom which is bonded to a central carbon atom, an amino group and a carboxyl group both bonded to the same carbon atom, a R group which is also attached to the central carbon atom, the molecule is an amino acid(a monomer).

The answer would be c). amino acids

"do a testcross with a homozygous recessive plant."

substitution is the answer in this case