Question

Read the statements given below.

I. Thiamine and Uracil are pyrimidines found in DNA & RNA respectively.
II. Number of base pairs per turn in B - DNA helix is 10.

Choose the correct option.

• A. Both statements I & II are correct
• B. Only statement II is correct
• C. Both statement I & II are incorrect
• D. Only statement I is correct.

Answer 1

Answer: (A)

• Thymine and uracil are pyrimidines (nitrogenous bases) found in DNA & RNA respectively.
• It is a characteristic feature of both these nucleic acids. On the other hand, B-DNA, the most common double-helical structure found in nature, has a double helix which is right-handed with about 10–10.5 base pairs per turn.

So, the correct option is 'both the statements I & II are correct'.