Question

According to the original model of DNA, as proposed by Watson and Crick in 1953. DNA is a

• A. Right handed helix
• B. Helix that makes a full turn every 70 nm
• C. Helix where one turn of DNA contains 20 basepairs
• D. Two stranded helix where each strand has same polarity

Answer 1

The correct option is A Right handed helix

The model of DNA was given by Watson and Crick in the year 1953. It is the hereditary molecules that are responsible for carrying the characters from parents to offspring. The DNA is in the $B$-form that shows right-handed coiling. The spiral length is $34\mathring{A}$ and its diameter of $20\mathring{A}$. One spiral turn has 10 base pairs. Thus the correct answer is option A.