Advertisements
Advertisements
Question
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 ?
Solution
Adenosine (A) and guanine (G) are purines, while thymine (T) and cytosine (C) are pyrimidines. According to the Chargaff's rule, purine will pair with pyrimidines; therefore, 'A pairs with T' and 'C pairs with G'.
We have 520 adenine bases; therefore, there should be 520 thymine bases.
A + T = 520 + 520 = 1040
Total number of nucleotides are 2000.
∴ G + C = 2000 − 1040 = 960
G = 960/2 = 480
Therefore, total number of purine bases are 1000 (A + G = 520 + 480).
APPEARS IN
RELATED QUESTIONS
A DNA segment has a total of 1000 nucleotides, out of which 240 of them are adenine containing nucleotides. How many pyrimidine bases this DNA segment possesses?
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 ?
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
Give the scientific term for the following:
The smallest unit of DNA can mutate.
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 nucleosome.
