Question

9. The SOS repair mechanism is activated by which of the following?
i. 5 bromouracil
ii. Acrydine orange
iii. Hydroxylamine
iv. Thymidine Dimers​

Answer 1

thymidine dimers

SOS is a ode distress signal

Answer 2

iv. Thymidine Dimers​

Cyclobutane thymine dimer is a photolesion delivered by UV radiation in daylight and is considered as a potential element causing skin disease. It is shaped as a covalently reinforced complex of two adjoining thymines on a solitary strand of DNA. This harm is exceptionally successive yet very nearly 90% of TDs are fixed inside a brief time frame of the request for minutes, and a couple is tentatively discernible and begins future changes at the cell level. It is a result of the bright light of thymine (free in ice or bound in nucleic acids) in which two thymine buildups become connected by the development of a cyclobutane ring including both C-5's and both C-6's to the detriment of the two twofold bonds; a few stereoisomeric structures are conceivable.