Assertion : dna has a double strand helix structure.
Reason : the two strands in a dna molecule are exactly similar.
(A) Both a assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(B) Both assertion and reasen are correct statements, but reason is not the correct explanation of the assertion.
(D) Assertion is correct, but reason is wreect statement.
(D) Assertion is correct, but reason is correct statement
