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प्रश्न
A DNA segment has a total of 1,500 nucleotides, out of which 410 are Guanine containing nucleotides. How many pyrimidine bases this segment possesses ?
उत्तर
Cytosine and thymine are pyrimidines.
According to Chargaff's rule, the ratio of purines to pyrimidines is equal.
Thus, the number of cytosine (C) will be equal to the number of guanine (G).
Number of guanine-containing nucleotides = 410
Thus,
G = C = 410
Now,
G + C = 410 + 410 = 820
The number of adenine (A) will be equal to the number of thymine (G).
Thus,
A + T = Total number of nucleotides – Nucleotides containing G and C nitrogenous bases
= 1500 – 820
= 680
Therefore,
A = 340 and T = 340
The number of adenine will be equal to number of thymine, which is 340.
Therefore,
Number of pyrimidines that the segment possess = C + T
= 410 + 340
= 750
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संबंधित प्रश्न
Draw a schematic diagram of a part of double stranded dinucleotide DNA chain having all the four nitrogenous bases and showing the correct polarity.
A DNA segment has a total of 2,000 nucleotides, out of which 520 are adenine containing nucleotides. How many purine bases this DNA segment possesses ?
Explain the two factors responsible for conferring stability to double helix structure of DNA.
Nucleoside is a nucleotide without________.
(A) Sugar
(B) Nitrogen base
(C) Hydrogen bond
(D) Phosphate group
Length of DNA with 23 base pairs is :
(1) 78.4 Å
(2) 78.2 Å
(3) 78 Å
(4) 74.8 Å
Expand the following abbreviation :
rDT
What is RNA interference? Give any one application of RNA interference.
Which of the following sequences of mRNA will NOT translate completely?
Draw a well-labelled diagram of tRNA.
Draw a well-labelled diagram of nucleosome.
