29) What is the function of topoisomerase? A) relieving strain in the DNA ahead

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29) What is the function of topoisomerase? A) relieving strain in the DNA ahead of the replication forlk B) elongating new DNA at a replication fork by adding nucleotides to the existing chain C) adding methyl groups to bases of DNA D) unwinding of the double helix E) stabilizing single-stranded DNA at the replication fork 30) What is the role of DNA ligase in the elongation of the lagging strand during DNA replication? A) It synthesizes RNA nucleotides to make a primer. B) It catalyzes the lengthening of telomeres. C) It joins Okazaki fragments together D) It unwinds the parental double helix. E) It stabilizes the unwound parental DNA. 31) Which of the following help(s) to hold the DNA strands apart while they are being replicated? A) primase B) ligase C) DNA polymerase D) single-strand binding proteins E) nuclease 32) Which of the following lists of structures correctly represents the order of increasingly higher levels of organization of chromatin? A) nucleosome, 30-nm chromatin fiber, looped domain B) looped domain, 30-nm chromatin fiber, nucleosome C) looped domain, nucleosome, 30-nm chromatin fiber D) nucleosome, looped domain, 30-nm chromatin fiber E) 30-nm chromatin fiber, nucleosome, looped domain 33) During DNA replication, which of the following enzymes separates the DNA strands during replication? A) helicase B) DNA polymerase III C) ligase D) DNA polymerase I E) primase ich of the following enzymes covalently connects segments of 34) During DNA replication, wh DNA? A) helicase B) DNA polymerase III C) ligase D) DNA polymerase I E) primase

Explanation / Answer

29A) releiving strain in the DNA ahead of replication fork.

30.C) it joins okazaki fragments together.

31.D) single stranded binding protein.

32.A) nucleosome, 30nm chromatin fiber, looped domain.

33.A) helicase

34.C) ligase

35.E) primase

36.A.

37.C) A poly A tail is added to the 3' end of mRNA and 5' CAP is added to the 5' end-

38.A) it is a reconginition site for a specific transcription factor.

39.C) 5' to 3' along the template strand.

40.D) it assist in the translocation of polypeptides across the ER membrane.

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