Biology·MCQ Practice
DNA Structure — MCQ Practice
NEET UG
Version 1Updated 21 Mar 2026
Interactive MCQ Practice
Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 6 questions available.
Q1easy
Which of the following statements about the DNA double helix is INCORRECT?
Q2medium
A segment of double-stranded DNA has 120 adenine bases and 140 cytosine bases. What is the total number of nucleotides in this segment?
Q3easy
The phosphodiester bond in a DNA strand connects which two components?
Q4medium
If a double-stranded DNA molecule has 20% Guanine, what is the percentage of Thymine in the same molecule?
Q5easy
Which type of bond is responsible for holding the two strands of the DNA double helix together?
Q6medium
In the B-DNA double helix, the distance between two adjacent base pairs is approximately: