Question

1 Point

DNA is made up of pairs of nitrogenous bases. Which of the following
nitrogenous bases is paired correctly?
O
A. Cytosine thymine
O
B. Guanine-guanine
O
C. Thymine-adenine
O
D. Adenine-guanine

Answer 1

C- Thymine - Adenine nitrogenous base is paired correctly.

Step-by-step explanation:

A DNA nucleotide is made of phosphate group, sugar and nitrogenous base. There are 4 kinds of nitrogenous bases GUANINE(G), ADENINE(A), THYMINE(T) and CYTOSINE(C). IN which guanine and adenine are purines having double ringed structure. and cytosine and thymine are pyrimidines having single ring structure. In DNA complementry base pairing C form 3 hydrogen bonds with G and T form 2 hydrogen bond with A.

This specific orientation is because of their specific complementary structure.

Answer 2

The correct answer is C. Thymine-adenine

Step-by-step explanation:

The DNA is formed by the nitrogen bases adenine, cytosine, guanine and thymine.

The pairings between bases are:

-Adenine with Thymine

-Cytosine with guanine