Question

Which of the following statements regarding a double helical molecule of DNA is true?

• A. Each strand is identical
• B. Each strand replicates itself
• C. Bases are perpendicular to the axis
• D. All hydroxyl groups of pentose are involved in linkage

Answer 1

Answer: (C)

Bases are perpendicular to the axis

The double helical model of DNA proposed by Waston and Crick It consists the nitrogenous bases attached to the pentose sugar moiety and is perpendicular to the axis. The strands are antiparallel and the length of DNA is 34 $A^0$ per turn and each turn consists 10 base pairs.