Respuesta :
Answer:
Oxygen.
Explanation:
Proteins are made of the polymers of the amino acids. Amino acids acts as the monomer of the protein that are linked through the peptide bond. There are 20 standard amino acids.
Amino acids contain the amino group, the carboxyl group, side chain R group and the hydrogen atoms. Oxygen is not directly attaches to the central carbon atom and the oxygen is attached to the carboxyl group. The oxygen is not directly present in the amino acids.
Thus, the correct answer is oxygen.
The given option that is not attached to the central carbon atom in an amino acid is;
D: An Oxygen
Chemical functional groups
To answer this question, let us look at the simple molecular structure of amino acids.
The basic structure of amino acid consists of an amine NH2 and carboxyl (COOH) functional groups.
Now, there is usually an R-Group for each particular amino acid on the side chain of it.
Now, although oxygen is one of the key constituents of amino acid, it is pertinent to note that it oxygen is not directly attached with the central carbon atom in an amino acid.
Read more about chemical functional groups at; https://brainly.com/question/9165411
