NEET
- Exam
- NEET
- Subject
- Botany
- Chapter
- Biomolecules (B)
NEET · Botany · Biomolecules (B)
How many base pairs does one full turn of the helical strand in DNA...
How many base pairs does one full turn of the helical strand in DNA involve?
Options
- A5
- B8
- C9
- D10
Correct answer
D. 10
Step-by-step solution
There are two hydrogen bonds between A and T in DNA and 3 between G and C. One full turn of the helical strand in DNA involves ten base pairs or ten steps of ascent. Each step of ascent measures 3.4Å. Hence, the pitch of B-DNA is 34Å. The rise per base pair in B-DNA is 3.4Å.