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
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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
All of the following statements about DNA replication in prokaryotes are true except（）
A. DNA replication is conservative
B. DNA synthesis occurs in the 5’ to 3’ direction
C. Requires a 3’OH to initiate replication which is provided by an RNA primer
DNA replication initiate from specific origin
As B-DNA is gradually heated, the absorbance at 260 nm（）
A. increases
B. decreases
C. stays the same
D. It is unpredictable
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