Question

question 9 / 10 which term refers to the molecule shown? a. nucleotide b. amino acid c. polypeptide d. nitrogenous base

Explanation:

A nucleotide is a building - block of nucleic acids, consisting of a sugar, a phosphate group, and a nitrogenous base. An amino acid is the building - block of proteins, with an amino group, a carboxyl group, a hydrogen atom, and a side - chain (R - group) attached to a central carbon. A polypeptide is a chain of amino acids. A nitrogenous base is part of a nucleotide. Without seeing the molecule, we can analyze the definitions. If it has an amino and carboxyl group and a side - chain, it's an amino acid.

Answer:

Since the molecule is not shown, we can't be certain. But based on definitions:
If it has an amino group, carboxyl group, central carbon and R - group: B. amino acid
If it has a sugar, phosphate and nitrogenous base: A. nucleotide
If it's a chain of amino acids: C. polypeptide
If it's just a nitrogen - containing molecule as part of a nucleotide: D. nitrogenous base