Multiple Choice
Which of the following is a normal constituent of urine?
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1. Introduction to Microbiology
Introduction to Microbiology
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Which repair process in Escherichia coli uses visible light to repair thymine dimers?
A
Base excision repair
B
Photoreactivation
C
Nucleotide excision repair
D
Mismatch repair
Verified step by step guidance1
Understand that thymine dimers are DNA lesions caused by ultraviolet (UV) light, where two adjacent thymine bases become covalently linked, distorting the DNA structure.
Recognize that Escherichia coli has multiple DNA repair mechanisms, each specialized for different types of DNA damage.
Identify that photoreactivation is a repair process that specifically uses visible light to directly reverse thymine dimers by breaking the covalent bonds between the thymine bases.
Recall that other repair mechanisms like base excision repair, nucleotide excision repair, and mismatch repair do not use visible light and have different roles in DNA repair.
Conclude that the repair process in Escherichia coli that uses visible light to repair thymine dimers is photoreactivation.
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