Question

Purines and pyrimidines are

Select one:
a. classification groups for nitrogen bases.
b. names of specific types of DNA molecules.
c. able to replace phosphate groups from defective DNA.
d. nitrogen bases found in amino acids.

Answer 1

Purines and pyrimidines are classification groups for nitrogen bases. Adenine and guanine are classified as purines, while cytosine, thymine, and uracil are pyrimidines. These nitrogenous bases are essential in DNA and RNA. Hence the correct answer is option A

Step-by-step explanation:

Purines and pyrimidines are classification groups for nitrogen bases. Adenine and guanine are classified as purines, which have a double ring structure with several nitrogen atoms. Cytosine, thymine (found in DNA only), and uracil (found in RNA only) are pyrimidines, which have a single ring structure. These nitrogenous bases are the building blocks of DNA and RNA.

Hence the correct answer is option A