Botany-DNA Structure
NEET Botany DNA Structure MCQ Question
Type: MCQ-conceptual-Hard-Class 12
Which of the following statements about DNA structure is correct?
A
The backbone of DNA is formed by alternating sugar and phosphate groups.
B
DNA contains ribose sugar, which has an additional –OH group at the 2' position.
C
Thymine is replaced by uracil in the structure of DNA.
D
The 5'-end of a DNA strand has a free OH group on the sugar component.
Correct Answer
Option A
Detailed Explanation
The backbone of a DNA molecule is indeed formed by sugar and phosphate groups, as stated in the NCERT context. In contrast, DNA contains deoxyribose, not ribose, and thymine is not replaced by uracil in DNA structure.
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