DNA REPLICATION QUIZ

During DNA replication in prokaryotes, synthesis begins on the circular chromosome

at the promoter

randomly on the chromosome

always at the same place

at any stretch of DNA that is high in AT pairs

TRUE ANSWER : ?
YOUR ANSWER : ?

In E.coli, which enzyme synthesizes the RNA primer for Okazaki fragments?

DnaC

DnaA

all of these

DnaG

TRUE ANSWER : ?
YOUR ANSWER : ?

DNA gyrase is inhibited by

cephalosporin

tetracycline

nalidixic acid

both (a) and (b)

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following lacks 3'-5' exonuclease activity?

Short fragment of DNA polymerase I

All of these

T4 DNA ligase

Taq DNA polymerase

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following enzymes unwind short stretches of DNA helix immediately ahead of a replication fork?

Helicases

DNA polymerases

Topoisomerases

Single-stranded binding proteins

TRUE ANSWER : ?
YOUR ANSWER : ?

Both strands of DNA serve as templates concurrently in

mismatch repair

none of these

replication

excision repair

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following statements on replication in E.coli is correct?

Occurs only when λ phase has infected E. coli

It occurs in bidirectional manner

Always uses T7 DNA polymerase when infected by T7 phage

It occurs in a unidirectional manner

TRUE ANSWER : ?
YOUR ANSWER : ?

DNA replication rates in prokaryotes are approximately of the order of

1,000 bases per second

1,00 bases per second

10,000 bases per second

10 bases per second

TRUE ANSWER : ?
YOUR ANSWER : ?

During which of the following process a new copy of a DNA molecule is precisely synthesized?

Translation

Transcription

Trasformation

Replication

TRUE ANSWER : ?
YOUR ANSWER : ?

The synthesis of DNA by DNA polymerase occurs in the

5' to 5' direction

3' to 5' direction

5' to 3' direction

3' to 3' direction

TRUE ANSWER : ?
YOUR ANSWER : ?

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