DNA and RNA: Understanding Genetic Material and Replication

What was the primary reason for the evolution of DNA from RNA?

• RNA could not act as a genetic material.

• RNA was unstable due to its reactivity.

• RNA was not reactive enough.

• RNA was too stable.

Which method describes the process of DNA replication?

• Conservative

• Semiconservative

• Dispersive

• Random

Who were the scientists that provided experimental proof for the semiconservative replication of DNA?

• Franklin and Wilkins

• Taylor and colleagues

• Meselson and Stahl

• Watson and Crick

What was used to distinguish heavy DNA from normal DNA in Meselson and Stahl's experiment?

• Chromatography

• Centrifugation in a density gradient

• Spectroscopy

• Electrophoresis

What is the main enzyme involved in the process of DNA replication?

• RNA polymerase

• Helicase

• DNA ligase

• DNA polymerase

What is the role of deoxynucleoside triphosphates in DNA replication?

• They provide energy and act as substrates.

• They unwind the DNA helix.

• They repair DNA strands.

• They act as a catalyst.

In which direction does DNA polymerase catalyze the polymerization of nucleotides?

• 3' to 5'

• Both directions simultaneously

• 5' to 3'

• Random direction

What is the term for the region where DNA replication originates?

• Replication bubble

• Origin of replication

• Replication fork

• Replication site

During which phase of the cell cycle does DNA replication occur in eukaryotes?

• G1 phase

• S phase

• G2 phase

• M phase

What happens if cell division fails after DNA replication?

• The cell repairs itself.

• The cell becomes polyploid.

• The cell undergoes apoptosis.

• The cell dies.