Meselson-Stahl Experiment

What is the process of DNA replication?

• DNA replication is the process of breaking down DNA into smaller fragments.

• DNA replication involves the synthesis of RNA from a DNA template.

• DNA replication is the process of copying a DNA molecule to produce two identical DNA molecules.

• DNA replication is the process of converting DNA into proteins.

Describe the methodology used in the Meselson-Stahl experiment.

• The experiment showed that DNA replication is conservative.

• The results indicated that DNA replication is dispersive.

• The Meselson-Stahl experiment demonstrated that DNA replication is semi-conservative.

• The methodology involved using radioactive isotopes to trace DNA.

What distinguishes heavy DNA from light DNA?

• Light DNA contains more nucleotides than heavy DNA.

• Heavy DNA has more heavy isotopes than light DNA.

• Heavy DNA is lighter than light DNA.

• Heavy DNA is found only in certain organisms.

Explain the concept of semi-conservative replication.

• DNA replication occurs in a conservative manner, preserving both original strands.

• DNA replication involves the complete breakdown of the original DNA strand.

• Semi-conservative replication is the mechanism by which DNA is replicated, resulting in two DNA molecules, each containing one original and one new strand.

• Semi-conservative replication results in three identical DNA strands.

How did Meselson and Stahl demonstrate semi-conservative replication?

• They demonstrated replication using only one type of nitrogen isotope.

• Meselson and Stahl demonstrated semi-conservative replication by using nitrogen isotopes and density gradient centrifugation to show that each new DNA molecule consists of one old strand and one new strand.

• They showed that DNA replication occurs in a conservative manner.

• They used radioactive phosphorus to label DNA strands.

What is the significance of using isotopes in the experiment?

• Isotopes are primarily used for aesthetic purposes in experiments.

• Isotopes help in reducing the time taken for experiments.

• Isotopes provide a means to trace and analyze processes in experiments.

• Isotopes are used to increase the temperature of reactions.

What were the main conclusions drawn from the Meselson-Stahl experiment?

• DNA replication is dispersive.

• DNA replication occurs in a circular manner.

• DNA replication is conservative.

• DNA replication is semi-conservative.

What is the significance of the term 'semi-conservative' in DNA replication?

• It indicates that both strands of DNA are completely new.

• It means that one strand is old and one strand is new in each DNA molecule after replication.

• It refers to the process of DNA being conserved without any changes.

• It describes the method of DNA replication that produces three strands.