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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance5 Marks
Question
What are the characteristics of DNA?
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Answer

Following are some features of DNA:
  1. DNA is made up of two polynucleotide chains, where the backbone is made up of sugar and phosphate groups and the nitrogenous bases project towards the centre.
  2. There is complementary base pairing between the two strands of DNA.
  3. The two strands are coiled in right-handed fashion and are anti-parallel in orientation. One chain has a 5′ → 3′ polarity while the other has 3′ → 5′ polarity.
  4. The diameter of the strand is always constant due to pairing of purine and pyrimidine, i.e., adenine is complementary to thymine while guanine is complementary to cytosine.
  5. The distance between two base pairs in a helix is 0.34nm and a complete turn contains approximately ten base pairs. The pitch of the helix is 3.4nm and the two strands are righthanded coiled.

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