Question

Regarding assertion and reason, select the right option.

Assertion [A]: Charge of DNA molecule is negative.
Reason [R]: Histone proteins associated with DNA are positively charged.

• A. Both A and R are true and R explains A
• B. Both A and B are true, but R does not explain A
• C. A is true and R is false
• D. Both A and R are false

Answer 1

The correct option is B

Both A and B are true, but R does not explain A

While it is true that histone proteins are positively charged, this is not the reason for the overall negative charge of DNA molecule. It is the presence of phosphate groups in individual nucleotides that confers the overall negative charge to the DNA molecule.