of the following are NOT true about DNA polymerase I in E.coli:()
A: It
can repair the gap in the single-strand DN
B: It
can replace DNA polymerase III to add dNTP into DNA chain when DNA
template is damaged.
C: It
possesses activity of 3’→5’ exonuclease.
D: Using
dNTP as substrate.
E: It
possesses activity of 5’→3’ endonuclease.
举一反三
- Which of the following are NOT true about DNA polymerase I in E. coli: A: It can repair the gap in the single-strand DNA. B: It can replace DNA polymerase III to add dNTP into DNA chain when DNA template is damaged. C: Using dNTP as substrate. D: It possesses activity of 5’→3’ endonuclease.
- The 5'→3' exonuclease activity of intact DNA polymerase I can replace a segment of DNA (or RNA) paired to the template strand, in a process known as ____________________.
- Which<br/>of the following statements about DNA polymerase III is NOT true:() A: Deoxyribonucleotide<br/>are connected to 5’ hydroxyl of synthesized DNA by DNA pol III B: To<br/>catalyze deoxyribonucleotide connected to the primer C: Requires<br/>four kinds of 5’-dNTP D: To<br/>catalyze deoxyribonucleotide connected to 3’ terminal of RNA<br/>primer E: Pyrophosphate<br/>is one of the product
- Which<br/>is correct about DNA polymerase and RNA polymerase:() A: RNA<br/>polymerases use nucleoside diphosphate instead of nucleoside<br/>triphosphate for synthesis of polynucleotide chains B: RNA<br/>polymerases need primer and add nucleotides in the 5 'end of the<br/>polynucleotide chain C: DNA<br/>polymerase can add nucleotides in both ends of the polynucleotide<br/>chain D: All<br/>of the RNA polymerases and DNA polymerases can only add nucleotides<br/>in the 3’ end of the polynucleotide chain
- DNA<br/>replication requires: (1) DNA polymerase III, (2) helicase, (3) DNA<br/>polymerase I,<br/>(4) DNA-directed RNA polymerase, (5) DNA ligase, the correct order of<br/>their participation is:() A: 4,3,1,2,5 B: 2,3,4,1,5 C: 4,2,1,5,3 D: 4,2,1,3,5 E: 2,4,1,3,5
内容
- 0
Which<br/>of the following statement about DNA polymerase of eukaryotes is NOT<br/>true:() A: DNA<br/>pol α/primase are involved in initial synthesis of the nascent<br/>strand. B: DNA<br/>polδ and ε are mainly responsible for the synthesis of<br/>DNA chains. C: Replacement<br/>of DNA polymerase could happen during DNA synthesis process. D: There<br/>are five kinds of DNA pol:α、β、γ、δ<br/>and ε in eukaryotes
- 1
Which of the following is not the difference between DNA polymerase and RNA polymerase?() A: The fidelity of<br/>the two enzymes is different when the template chain is copied B: The number of<br/>reaction starting sites is different C: Different reading<br/>directions of template chain D: Size of reaction<br/>products E: The reaction<br/>process is bidirectional
- 2
The correct statement about RNA polymerase and DNA polymerase is (1 point) A: Synthesis of polynucleotide chain using nucleoside diphosphate B: RNA polymerase requires primers and bases are added at the 5′-end of the extended polynucleotide chain C: DNA polymerase can only synthesize DNA using RNA as a template D: DNA polymerase can add nucleotides on both ends of a chain at the same time E: , DNA polymerase and RNA polymerase can catalyze the formation of 3',5'-phosphodiester bond
- 3
Comparing<br/>DNA polymerase and RNA polymerase, the only differences is() A: The<br/>former has proof-reading activity, the latter doesn’t. B: The<br/>former requires primer, the latter doesn’t. C: The<br/>former can grow in both 5′→3′ and 3′→5′<br/>direction, the latter can only grow in 5′→3′. D: The<br/>former requires topoisomerase to relief stress, the latter doesn’t.
- 4
Reverse transcriptase A: has 5ˊ → 3ˊ polymerase activity B: has 3ˊ → 5ˊ exonuclease activity C: is an RNA-dependent DNA polymerase D: is a DNA-dependent DNA polymerase