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Question: Answered & Verified by Expert
The sequence of N-bases in one strand of DNA is '3 TAC CAC TCC ATA ATT 5'. How many purines will be present in the Watson crick structure of this DNA?
BiologyMolecular Basis of InheritanceNEET
Options:
  • A 18
  • B 5
  • C 15
  • D 10
Solution:
1417 Upvotes Verified Answer
The correct answer is: 15
A purine is an aromatic heterocycle composed of carbon and nitrogen. Purines include adenine and guanine, which participate in DNA and RNA formation. Purine is a heterocyclic aromatic organic compound that consists of a pyrimidine ring fused to an imidazole ring.

According to the Watson–Crick model of DNA, DNA is double-stranded.

The given sequence of a DNA strand is:

3' TAC CAC TCC ATA ATT 5'
5' ATG GTG AGG TAT TAA 5'

 

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