AQA A Level · Biology 7402

Nucleic acids are important information-carrying molecules: Practice Questions

5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Nucleic acids are important information-carrying molecules.

8 questions16 marksFree, no account

Question 1

1 mark

Which of the following describes the formation of a phosphodiester bond during the synthesis of a polynucleotide?

Question 2

1 mark

A scientist is studying a molecule with the following properties: it is a polymer of nucleotides, it is relatively short, and it is single-stranded. Which molecule is being described, and what is its primary function?

Question 3

1 mark

During semi-conservative DNA replication, the template strands must be separated and new strands synthesized. Which of the following correctly describes the roles of DNA helicase and DNA polymerase?

Question 4

1 mark

Nucleic acids are important information-carrying molecules. Which of the following correctly identifies a structural component found in a DNA nucleotide but not in an RNA nucleotide?

Question 5

1 mark

In the process of semi-conservative DNA replication, which of the following is true regarding the role of DNA polymerase?

Question 6

2 marks

A specific monomer is used to build large information-carrying molecules in cells. If this monomer contains a ribose pentose sugar and the organic base uracil, identify the polymer it helps to form and describe its general structure compared to DNA.

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Question 7

4 marks

During the process of semi-conservative DNA replication, specific enzymes are required to ensure genetic continuity. Explain the role of DNA helicase in this process and describe how the breakage of hydrogen bonds is essential for the subsequent action of DNA polymerase.

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Question 8

5 marks

Describe the chemical formation of a phosphodiester bond between two nucleotides in a DNA molecule, specifically identifying the reaction type and the atoms or groups involved.

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