GATE BT Mock Test - Biology Notes Online

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During which phase of the cell cycle does DNA replication occur?

G1 phase

G2 phase

S phase

M phase

In which direction does DNA replication occur?

5' to 3'

3' to 5'

Both directions simultaneously

3' to 3'

What is the function of DNA polymerase during replication?

Unwinds the DNA

Synthesizes new RNA strands

Adds nucleotides to the growing DNA strand

Joins Okazaki fragments

What is the function of ligase in DNA replication?

Unwinds the DNA

Adds nucleotides to the growing strand

Joins Okazaki fragments

Synthesizes RNA primers

What is the function of topoisomerase during DNA replication?

Adds nucleotides to the growing strand

Relieves the strain caused by unwinding DNA

Synthesizes RNA primers

Joins Okazaki fragments

What is the name of the short segments of DNA synthesized on the lagging strand?

Okazaki fragments

Leading fragments

Replication bubbles

Primer fragments

What is the role of primase in DNA replication?

Unwinds the DNA

Synthesizes the RNA primer

Adds nucleotides to the new strand

Removes RNA primers

What is the purpose of the RNA primer in DNA replication?

To bind to the leading strand

To provide a 3' OH group for DNA polymerase

To unwind the DNA helix

To remove nucleotides from the lagging strand

Which strand is synthesized discontinuously during DNA replication?

Leading strand

Lagging strand

Both strands simultaneously

Both strands continuously

Which enzyme is responsible for unwinding the DNA double helix?

Helicase

DNA polymerase

Ligase

Topoisomerase