DNA Replication and Transcription Quiz

What is the role of helicase in DNA replication?

• It adds nucleotides to the DNA strand.

• It breaks hydrogen bonds and unwinds the DNA double helix.

• It synthesizes RNA primers.

• It links Okazaki fragments.

Which enzyme is responsible for adding nucleotides to the leading strand?

• Helicase

• RNA primase

• DNA ligase

• DNA polymerase III

How is the lagging strand formed during DNA replication?

• By synthesizing RNA primers

• Continuously from 5' to 3'

• By adding nucleotides to the 3' end

• In fragments known as Okazaki fragments

What is the function of RNA primase in DNA replication?

• It adds nucleotides to the leading strand.

• It synthesizes RNA primers for the lagging strand.

• It unwinds the DNA double helix.

• It links Okazaki fragments.

Which enzyme replaces RNA primers with DNA on the lagging strand?

• DNA polymerase I

• DNA polymerase III

• RNA polymerase

• Helicase

What initiates the process of DNA transcription?

• Unwinding of the DNA double helix

• Formation of Okazaki fragments

• Linking of nucleotides

• Binding of RNA polymerase to the promoter site

What is the role of the transcription initiation complex?

• To facilitate the start of transcription

• To add nucleotides to the DNA strand

• To unwind the DNA double helix

• To replace RNA primers with DNA

During transcription, what pairs with complementary DNA nucleotides?

• DNA nucleotides

• Proteins

• Enzymes

• RNA nucleotides

What marks the end of DNA transcription?

• The release of the new mRNA molecule

• The formation of the transcription initiation complex

• The unwinding of the DNA double helix

• The binding of RNA polymerase to the promoter site

What is the final product of DNA transcription?

• Messenger RNA (mRNA)

• A protein

• An RNA primer

• A new DNA strand