In E.coli, the RNA primer at the beginning of each Okazaki fragment is removed by（）
A. DNA polymerase I
B. DNA polymerase II
C. DNA polymerase III
DNA polymerase V
查看答案
Which does not apply to most bacterial DNA（）
A. Circular
B. Relaxed
C. Not packed into nucleosomes
D. Supercoiled
The 3′ → 5′ exonuclease activity of E. coli DNA polymerase III accounts for the__ of polymerization（）
A. low error rate
B. high speed
C. directionality
D. All of the above
How might mitochondrial DNA be distinguished from eukaryotic nuclear DNA（）
A. Mitochondrial DNA is in the Z conformation, nuclear DNA is in the B conformation
B. Mitochondrial DNA is methylated, nuclear DNA is not
C. Nuclear DNA is linear, mitochondrial DNA are circular
D. They cannot be distinguished and must be clearly separate during purification
Which of the following statements is not correct concerning to the prokaryotic genome and eukaryotic genome（）
A. There are many non-coding DNAs in eukaryotic genome
B. DNA are almost naked in prokaryotes
C. There are many operons in eukaryotic genome
D. Prokaryotic genome is a single circular DNA molecule
微信支付 
支付宝支付