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Purines

Nitrogenous b...

Question

Nitrogenous base present in DNA are
(a) Thymine
(b) Cytosine
(c) Adenine
(d) Guanine

A

a, b, c

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B

a, c, d

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C

b, c, d

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D

all

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Solution

The correct option is D all
Nitrogen base present in DNA are Adenine, Guanine, Thymine and Cytosine. But in RNA Uracil replaces the thymine.

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Statement 1: The four nitrogen bases in a DNA molecule are guanine, thymine adenine, cytosine.

Statement 2: Where adenine and thymine are purines and guanine and cytosine are pyrimidines.

Q. Two stretches of DNA, A and B are taken for a polymerase chain reaction. If DNA-A has more guanine-cytosine bases than adenine-thymine and DNA-B has more adenine-thymine bases than guanine-cytosine bases, which of the following statements is true regarding PCR of these two stretches of DNA?

Q. Assertion :Purine bases present in DNA are adenine and guanine. Reason: The base thymine is present in RNA while base uracil is present in DNA.

Q. Assertion :The heterocyclic compounds in nucleic acid are the nitrogenous bases. Reason: Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.

Q. The number of hydrogen bonds between Guanine and Cytosine; and between Adenine and Thymine in DNA are:

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