Which nitrogenous bases are needed to complete the DNA strand pictured below? Give your answer in order, from top to bottom. A. thymine, adenine, guanine, cytosine
B. adenine, thymine, guanine, cytosine
C. adenine, thymine, cytosine, guanine
D. cytosine, guanine, thymine, adenine

The nitrogenous bases are needed to complete the DNA strand pictured

below include adenine, thymine, guanine, cytosine.

DNA have bases which have their respective complementary base pairs with which they bind to. This makes them bind to each other in a specified and organized manner.

Examples of base pairs include  Adenine, Cytosine, Guanine and Thymine. Thymine(T) binds to Adenine(A) and Cytosine(C) binds to Guanine(G).

T=A

A=T

C≡G

G≡C

In the diagram thymine binds to adenine, adenine binds to thymine, cytosine binds to guanine and guanine binds to cytosine.

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From top to bottom, the nitrogenous bases needed to complement the DNA strand shown are adenine, thymine, guanine and cytosine (option B).

Explanation:

The DNA molecule is structured as two interlaced strands, linked by their nitrogenous bases through hydrogen bonds. The way the strands are linked depends on the complementarity of bases, where a purine binds to a pyrimidine.

In the DNA the nitrogenous bases are:

Adenine is complementary to thymine, with which it forms double bonds, while guanine is complementary to cytosine, and has a triple bond.

According to this, given a sequence of four bases, the complementary bases are arranged as follows

T=A

A=T

C≡G

G≡C

Then, the answer is that the nitrogenous bases that complement the given sequence are  adenine, thymine, guanine and cytosine.

    Obviously, the other options do not comply with the complementarity of bases, so they are incorrect.

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