Question

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

a. cytosine

b. adenine

c. uracil

d. thymine

e. guanine

Short answer

The given bases are:

a) It is a pyrimidine base.

b) It is a purine base.

c) It is a pyrimidine base.

d) It is a pyrimidine base.

e) It is a purine base.

Step-by-step solution

Part (a) Step 1: Given information

We have to tell the given base is purine or pyridimine.

cytosine

Part (a) Step 2: Explanation

Purine is a heterocyclic aromatic organic molecule having pyrimidine and imidazole rings fused together. Pyrimidine is a heterocyclic aromatic chemical compound made up of carbon and hydrogen.

It is a pyrimidine base.

Part (b) Step 1: Given information

We have to tell the given base is purine or pyridimine.

adenine

Part (b) Step 2: Explanation

Purine is a heterocyclic aromatic organic molecule having pyrimidine and imidazole rings fused together. Pyrimidine is a heterocyclic aromatic chemical compound made up of carbon and hydrogen.

It is a purine base.

Part (c) Step 1: Given information

We have to tell the given base is purine or pyridimine.

uracil

Part (c) Step 2: Explanation

Purine is a heterocyclic aromatic organic molecule having pyrimidine and imidazole rings fused together. Pyrimidine is a heterocyclic aromatic chemical compound made up of carbon and hydrogen.

It is a pyrimidine base

Part (d) Step 1: Given information

We have to tell the given base is purine or pyridimine.

thymine

Part (d) Step 2: Explanation

Purine is a heterocyclic aromatic organic molecule having pyrimidine and imidazole rings fused together. Pyrimidine is a heterocyclic aromatic chemical compound made up of carbon and hydrogen.

It is a pyrimidine base.

Part (e) Step 1: Given information

We have to tell the given base is purine or pyridimine.

guanine

Part (e) Step 2: Explanation

Purine is a heterocyclic aromatic organic molecule having pyrimidine and imidazole rings fused together. Pyrimidine is a carbon and hydrogen-based heterocyclic aromatic chemical molecule.

It is a purine base.