Exploring DNA Structure and Replication

Which experiment helped to confirm the semi-conservative model of DNA replication?

• Griffith's experiment

• Hershey-Chase experiment

• Avery-MacLeod-McCarty experiment

• Meselson-Stahl experiment

In the semi-conservative model of DNA replication, what happens to the original DNA strands?

• They are completely broken down and new strands are synthesized from scratch.

• They split in half and new strands are synthesized on each side.

• They combine with RNA strands to form new DNA.

• They remain intact and make a photocopy of themselves.

What are the three main components of a nucleotide in DNA?

• Sugar, phosphate, and lipid

• Sugar, protein, and nitrogenous base

• Phosphate, protein, and lipid

• Sugar, phosphate, and nitrogenous base

What does it mean when DNA strands are described as 'anti-parallel'?

• The strands are identical.

• The strands are complementary.

• The strands run in opposite directions.

• The strands run in the same direction.

Which enzyme is responsible for unwinding the DNA double helix during replication?

• Primase

• Ligase

• Helicase

• DNA polymerase

On which end of the DNA strand can new nucleotides be added during replication?

• 5-prime end

• 3-prime end

• Both 5-prime and 3-prime ends

• Neither 5-prime nor 3-prime ends

What is the role of RNA primase in DNA replication?

• It joins Okazaki fragments together.

• It unwinds the DNA double helix.

• It synthesizes new DNA strands.

• It adds RNA primers to the DNA strand.

What is the function of DNA ligase in DNA replication?

• It synthesizes RNA primers.

• It adds new nucleotides to the DNA strand.

• It unwinds the DNA double helix.

• It joins Okazaki fragments together.

How does DNA replication differ between prokaryotic and eukaryotic cells?

• Both prokaryotic and eukaryotic cells have multiple origins of replication.

• Eukaryotic cells have multiple origins of replication, while prokaryotic cells have a single origin.

• Both prokaryotic and eukaryotic cells have a single origin of replication.

• Prokaryotic cells have multiple origins of replication, while eukaryotic cells have a single origin.

What is the shape of DNA in prokaryotic cells?

• Helical

• Branched

• Circular

• Linear