 
			 
			MCQOPTIONS
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				| 1. | Overwinding or overtightening of DNA during replication is caused and removed by | 
| A. | DNAb, DNA polymerase | 
| B. | DNAa, gyrase | 
| C. | DNAb, gyrase | 
| D. | Single stranded protein, DNAa | 
| Answer» D. Single stranded protein, DNAa | |