There are $20 %$ adenine among the bases in a DNA fragment measuring $6.8$ nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively.

Question

Q. There are

20 %

adenines among the bases in a DNA fragment measuring

6.8

nm in length. The number of pentose, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively.

Answer 1

So the total number of nitrogen base-pair = 20
Hence, nucleotides = 40
1 nucleotide = 1 nitrogen base + 1 pentose sugar + 1 phosphate groups
So, pentose sugar = 40
Phosphate groups = 40
From the percentage mentioned these are 8 combinations of A-T and 12 combinations of C=G in the given fragment of DNA. Adenine is paired to thymine by two hydrogen bonds and cytosine is paired to guanine by three hydrogen bonds.
So 8

\times

2 = 16 and 12

\times

3 = 36
16+ 36 = 52 hydrogen bonds.

Answer 2

So the correct answer in the sequence is option D.

There are 20% adenine among the bases in a DNA fragment measuring 6.8 nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively.

So the correct answer in the sequence is option D.

There are $20 %$ adenine among the bases in a DNA fragment measuring $6.8$ nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively.