Topoisomerase II catalyzes the transient breaking and rejoining of two strands of duplex DNA which allows the strands to pass through one another, thus altering the topology of DNA.
举一反三
- Which<br/>one can separate the parental DNA strands? A: DnaC B: DNA-pol C: topoisomerase D: primase E: helicase
- The function of DNA polymerase I is to replace RNA primer with DNA. On which strand would you expect DNA polymerase I to be more active? A: the leading strand B: the lagging strand C: equally active on both strands D: neither , only DNA polymerase III is involved in synthesis
- DNA replication, one of the new strands will grow continuously, it is<br/>called () A: Continuous strand B: Faster strand C: Leading strand D: Lagging strand
- The<br/>actions of alkylating agents:( ) A: are<br/>cell-cycle dependent B: Cause<br/>cross-linking of DNA strands C: Inhibit<br/>DNA synthesis D: Inhibit<br/>protein synthesis
- RNA polymerase: () A: binds tightly to a region of DNA thousands of base pairs away from<br/>the DNA to be transcribed. B: can synthesize RNA chains without a primer. C: has a subunit called λ (lambda), which acts as a proofreading<br/>ribonuclease. D: separates DNA strands throughout a long region of DNA (up to<br/>thousands of base pairs), then copies one of them. E: synthesizes RNA chains in the 3' →direction.