Identify each of the following bases as a pyrimidine or a purine:

b. adenine

Identify each of the following bases as a pyrimidine or a purine:

e. guanine

The four nitrogenous bases commonly found in DNA are:

Select a correct structure for U.

What are the four major heterocyclic bases in DNA?

What are the two structural types of bases in DNA and RNA? Which bases correspond to each type?

Identify each of the following bases as a purine or a pyrimidine:

b.

Identify each of the following bases as a purine or a pyrimidine:

a. guanine