Question

figure 1. a representation of a reaction involved in the formation of a biological molecule
which of the following best explains the reaction represented in figure 1?
a it is a dehydration synthesis reaction involved in the formation of a lipid.
b the reaction is the hydrolysis of a nucleic acid and results in the formation of a nucleotide.
c the reaction is the hydrolysis of a nucleic acid and results in the formation of a phospholipid.
d it is a dehydration synthesis reaction involved in the formation of a polypeptide.

Explanation:

The reactants are amino - acids with an amino group ($\mathrm{H_2N -}$) and a carboxyl group ($\mathrm{-COOH}$). When two amino - acids react, a peptide bond ($\mathrm{-C - N -}$) is formed and a water molecule ($\mathrm{H_2O}$) is released. This is a dehydration synthesis reaction. Polypeptides are made up of amino - acids linked by peptide bonds. Lipids are not formed by this reaction, and the reaction is not hydrolysis of nucleic acids.

Answer:

D. It is a dehydration synthesis reaction involved in the formation of a polypeptide.