26. Nucleic Acids and Protein Synthesis

The four nitrogenous bases commonly found in DNA are:

Select a correct structure for U.

Draw a structure for cytosine.

The four nitrogenous bases commonly found in DNA are:

Select a correct structure for U.

Draw a structure for cytosine.

a. 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. <IMAGE>

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

a. guanine

Identify each of the following bases as a pyrimidine or a purine: (17.1)

a. cytosine

How do the bases cytosine and uracil differ? (17.1)

State whether each of the following components is present in DNA only, RNA only, or both DNA and RNA:

c. uracil

Identify each of the following as a purine or a pyrimidine and name them.

b. <IMAGE>

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

a. guanine

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