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DNA

Why in double...

Question

Why in double stranded DNA, number of purines equal the number of pyrimidines?

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Solution

According to Chargaff's rule, the number of purines and pyrimidines exist in ratio 1: 1. This is so because purines bond with pyrimidines to form nucleotides hence in a double-stranded DNA, the number of purines is equal to the number of pyrimidines.

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Which of these statements about eukaryotic DNA is incorrect?

I. It contains the complementary base pair A-U.

II. The two strands are antiparallel ( 5' - 3') with 10 base pairs in each helix of 3.4 Å.

III. Number of Purines > Number of Pyrimidines.

Q. Which of these statements about eukaryotic DNA is incorrect?
I. It contains the complementary base pair A-U.
II. The two strands are antiparallel with 10 base pairs in each turn of the helix .
III. Number of purines is more than the number of pyrimidines.

Q. The purine & pyrimidine pairs of complementry strands of DNA are held together by

Q. Purine or pyrimidine bases of the two strands of DNA molecule are joined together by .......... bonds.

Q. Which of the following characteristics is/are true regarding double stranded DNA?
a. Purine and pyrimidines are present in equal amount.
b. The bases of two strands are paired through hydrogen bonds.
c. Adenine is equimolar with guanine.
d. Phosphate group is linked to a nucleoside through N-glycosidic linkage.
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