Question

Given below are two statements :
Statement (I): Irradiation of DNA with UV light cause formation of covalent bond between the thymine molecules on the same strand.
Statement (II): Thiamine dimerization in DNA caused by UV radiations can be reverted by Photo-reactivation.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are false.
• B. Both Statement (I) and Statement (II) are true.
• C. Statement (I) is true but Statement (II) is false.
• D. Statement (I) is false but Statement (II) is true.

Hint:

Photoreactivation is a direct, error-free DNA repair mechanism found in bacteria, plants, and many animals, but is absent in placental mammals (including humans), which must rely on excision repair instead.

Answer 1

The Correct Option is B