Edexcel IAL DNA Replication Quiz

Which isotopes of nitrogen were used in Meselson and Stahl's experiment to demonstrate semi-conservative DNA replication?

• Nitrogen-14 and Nitrogen-15

• Nitrogen-12 and Nitrogen-14

• Nitrogen-13 and Nitrogen-15

• Nitrogen-15 and Nitrogen-16

In Meselson and Stahl's experiment, what was observed after the first replication of DNA in the 14N medium?

• DNA settled at the 15N only point

• DNA settled at the 14N only point

• DNA settled at a point between 15N and 14N only

• DNA settled at the 16N only point

What conclusion did Meselson and Stahl draw from their experiment regarding DNA replication?

• DNA replicates conservatively

• DNA replicates semi-conservatively

• DNA replicates disruptively

• DNA replicates irreparatively

What type of bond is formed by DNA polymerase during the joining of adjacent nucleotides in the newly synthesized strand?

• Peptide bond

• Glycosidic bond

• Phosphodiester bond

• Hydrogen bond

What is the term used to describe the replication of DNA where each strand formed contains one new strand and one original strand?

• Conservative replication

• Semi-conservative replication

• Disruptive replication

• Reparative replication

In DNA replication, what is used as the template for the synthesis of a new strand?

• Both DNA strands

• The leading strand only

• The lagging strand only

• One of the original DNA strands

Which enzyme is responsible for breaking the hydrogen bonds between complementary bases during the unwinding of the DNA double helix?

• DNA Ligase

• DNA Polymerase

• DNA Helicase

• RNA Polymerase