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Direct Repair (Quiz 2)

View the animation below, then complete the quiz to test your knowledge of the concept.






1Thymine dimers are mutations that are commonly caused by
A)X-rays.
B)UV light.
C)heat.
D)antibiotics.
E)disinfectants.



2The enzyme ________ catalyzes thymine dimer repair.
A)DNA isomerase
B)DNA ligase
C)DNA photolyase
D)DNA phosphatase
E)DNA transferase



3The enzyme methylguanine-DNA methyltransferase
A)removes entire guanine residues and replaces them with methyl groups.
B)removes methyl groups from the oxygen attached at the 6-position of guanines.
C)removes methyl groups from the nitrogen attached at the 6-position of guanines.
D)adds methyl groups to the oxygen attached at the 6-position of guanines.
E)adds methyl groups to the nitrogen attached at the 6-position of guanines.



4The repair of a thymine dimer using light involves the splitting of the dimer and reformation of the two thymines.
A)True
B)False



5Chemical agents can induce mutations.
A)True
B)False







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