DNA Replication

1. DNA was extracted from the cells of a rabbit and analysed to contain 5% Guanine. The percentage abundance of Thymine base in the DNA extract is

• 15%
• 25%
• 35%
• 45%

2. Uracil, found in RNA molecules is a

• purine
• cistron
• nucleotide
• pyrimidine

3. The part labelled 3 is the

• Nitrogenous base
• Phosphate group
• Pentose/5 carbon sugar
• H-bond

4. Which of the following is NOT a role of DNA

• Gene expression
• Encoding information
• Replication
• Recombination and Mutation
• Gene regulation

5. The lac operon consists of a promoter, operator and structural genes. The promoter gene

• is where the repressor protein binds to.
• specifies the number and sequence of amino acids.
• is where RNA polymerase binds to begin gene transcription.
• assists the restriction enzyme to make the cut at the specific site.

6. A triplet of nucleotides represented by bases such as CCG is known as

• a codon.
• a cistron.
• a nucleotide.
• an amino acid.

7. The Central Dogma Theory of Molecular Biology is summarised in the diagram below: Process E and the part labelled B are

• Process E - Transcription and B - DNA
• Process E - Translation and B - RNA
• Process E - DNA replication and B - RNA
• Process E - Protein Synthesis and B - DNA

8. Identify the significant characteristic of replication where the daughter molecules keep half the parent strand as shown in the diagram below.

• DNA replication is Universal
• DNA replication is Degenerative
• DNA replication is NOT overlapping
• DNA replication is Semi conservative

9. Okazaki fragments, formed during replication, are joined together by the enzyme

• primase.
• DNA ligase.
• DNA gyrase.
• RNA polymerase.

10. In the Operon, the corepressor is

• Lactose
• Tryptophan
• Inducer
• Regulator Gene