Question

Match the following terms with their descriptions below.

Question Selected Match Mutant allele is mutated to wild-type C. Reverse mutation Flat planar molecule able to sandwich between DNA bases A. Intercalator A region of DNA more likely to acquire mutations B. Hot spot Light-requiring thymine dimer repair mechanism D. Alkyltransferase Single-use repair of nitrogen mustard DNA alkylation E. Photoreactivation (18)

Which of the following is incorrectly paired?

	A.	UV light - Thymine dimer
	B.	Imino form cytosine- Transition
	D.	TNRE - Myotonic muscular dystrophy maternal anticipation
	E.	Proflavin - Frameshift

Alkylating agents such as ethyl methanesulfonate (EMS) function as mutagens to

	A.	promote deletions and insertions.
	C.	add oxygen free radicals to bases.
	D.	add ethyl or methyl groups.
	E.	fit between stacked bases and disrupt replication.

Match each term below with the appropriate description.

Question Selected Match Dimerization of adjacent thymine bases B. Nonhomologous end joining Adenine finds itself paired with cytosine after a tautomeric shift A. Base excision repair Catastrophic chromosome breakage following exposure to gamma radiation D. Photolyase Uracil incorporation into DNA C. Mismatch repair

Answer 1

ans-1) C,A,B,E,D , , ans-3) D , ans-4) D,C, B,A