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Molecular Basis of Inheritance question

2008 · Q70
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Molecular Basis of Inheritance question

2008 · Q70

NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
In the DNA molecule:
  1. A
    the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
  2. B
    there are two strands which run antiparallel one in 5'→ 3' direction and other in 3'→ 5'
  3. C
    there are two strands which run parallel in the 5'→ 3' direction
  4. D
    the proportion of adenine in relation to thymine varies with the organism
View written solutionFree

Correct answer: B

In the DNA molecule, there are two strands which run anti parallel one is 5' - 3' direction and other in 3' -5' direction, the two chains are held together by hydrogen bonds between their bases. Adenine (A), a purine of one chain his exactly opposite thymine (T), a pyramidine of the other chain. Similarly, cytosine (C), a pyrimidine lies opposite guanine (G), a purine. This allows a sort of lock & key arrangment between large sized purine & small sized pyrimidine. It is strengthened by the appearance of hydrogen bonds between the two.

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