25 !
in the molecule pictured above, the section in brackets within the box can be described as which of the following?

a. a nucleotide, which encodes genetic information in molecules such as dna
b. an amino acid, which encodes genetic information in molecules such as dna
c. a nucleotide, which is the basic component of proteins such as enzymes
d. an amino acid, which is the basic component of proteins such as enzymes