The correct statement about DNA semiconservative replication is:()
A. The substrate is four kinds of dNMP
B. The nucleotide sequences of two chains in the nascent DNA are identical
C. Both DNA polymerase and RNA polymerase are required during replication
D. The direction of synthesis for the new chain is 3’→5’ during replication
E. The nascent DNA chain can be synthesized de novo
查看答案
The role of RNA primer during DNA replication is:()
A. to guide DNA polymerase to bind with DNA template
B. to provide 5’ phosphate end
C. to provide attachment sites for four kinds of NTP
D. inducing synthesis of RNA
E. to provide 3’-OH end to initiate synthesis of new DNA
Which of the following fragment is complementary with TAGCAT during DNA replication:()
A. TAGCAT
B. ATGCTA
C. ATCGTA
D. AUCGUA
E. AUGCUA
Which substrate in the following can be catalyzed by DNA polymerase to form DNA molecule:()
A. dNTP
B. dNDP
C. dNMP
D. NTP
E. NDP
A double-stranded DNA fragment that is isotopically labeled with 15N, was cultured for n generations in the medium containing 14N. So the number of double-stranded DNA containing pure 14N is:()
A. 2^n+1
B. 2^n-1
C. 2^n-2
D. 2^n
E. 2^n+2
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