DNA Dynamics: Structure and Replication Quiz

What is the shape of the DNA molecule?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

Which of the following bases is not found in DNA?

• Adenine

• Cytosine

• Uracil

• Thymine

During DNA replication, what enzyme adds new nucleotides to the growing DNA strand?

• Helicase

• DNA polymerase

• Ligase

• Primase

What type of bond holds the two strands of DNA together?

• Covalent bonds

• Ionic bonds

• Hydrogen bonds

• Van der Waals forces

Which of the following is a correct base pairing in DNA?

• Adenine with Guanine

• Cytosine with Thymine

• Adenine with Thymine

• Guanine with Uracil

What is the function of the enzyme helicase in DNA replication?

• It synthesizes RNA primers.

• It adds nucleotides to the new DNA strand.

• It unwinds the DNA double helix.

• It joins Okazaki fragments.

Which of the following components is not a part of a nucleotide?

• Phosphate group

• Nitrogenous base

• Ribose sugar

• Deoxyribose sugar

In which direction is a new DNA strand synthesized during replication?

• 5' to 3'

• 3' to 5'

• 5' to 5'

• 3' to 3'

What is the role of ligase in DNA replication?

• Unwinding the DNA helix

• Synthesizing RNA primers

• Adding nucleotides to the growing DNA strand

• Joining Okazaki fragments on the lagging strand

Which of the following sequences correctly represents the complementary strand for the DNA sequence 5' - ATCGTA - 3'?

• 5' - TAGCAT - 3'

• 3' - TAGCAT - 5'

• 5' - TACGAT - 3'

• 3' - TACGAT - 5'