Question

What are adenine, guanine, cytosine, and thymine?

A. They are the four nitrogenous bases found in DNA.
B. They are the four sugars associated with DNA.
C. They form the phosphate backbone of DNA.
D. They are the four nucleotides that form DNA.

Answer 1

The answer is A, they are the four nitrogenous bases found in DNA

Answer 2

A. They are the four nitrogenous bases found in DNA.

Step-by-step explanation:

Nitrogenous bases are compounds that are part of the composition of DNA and RNA, which are the nucleic acids found in living organ cells.

They are five and can be classified into two types:

Purine or purine bases - adenine and guanine

Pyrimidine or pyrimidine bases - cytosine, thymine and uracil.