E2 F12 answer key

Negatively supercoiled dna c x shaped hairpin

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Unformatted text preview: tively supercoiled DNA c. X-shaped hairpin structure called a cruciform d. a G-quartet e. left-handed helix (Z-DNA) 4. Which of the following statements about nucleosomes is NOT correct? a. they contain proteins with high levels of Asn and Gln residues b. they constitute a major packing structure for DNA, approximately 80 Å in diameter c. the nucleosome core particle consist of approximately 146 bp of DNA wrapped around histone octomers: (H2A)2, (H2B)2, (H3)2, (H4)2 d. the nucleosome introduces negative superhelicity into mammalian DNA e. nucleosome particles must be disassembled and reassembled during replication and transcription 5. Which of the following statements about topoisomerases is NOT correct? a. type I –topoisomerases catalyze the relaxation of supercoiled DNA by changing the linking number in increments of one b. the prokaryotic type II topoisomerase, DNA gyrase, is inhibited by: O F N COOH N HN c. d. e. 6. type II topoisomerases make transient double stranded breaks in DNA transient, covalently modified Tyr residues are formed by both type I and II topoisomerases type I topoisomerases require the hydrolysis of ATP to complete a reaction cycle, but type II enzymes do not Examine the Figure of the eukaryotic replisome below. Which of...
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This test prep was uploaded on 03/23/2014 for the course CHEMISTRY 4141 taught by Professor Jonklaas during the Spring '13 term at Baylor.

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