Biology 9700 · AS & A Level · Structure of nucleic acids and replication of DNA

Structure of nucleic acids and replication of DNA — practice question

DNA and RNA belong to the group of nucleic acids.
(a)[2]

Explain the reasons RNA can be referred to as both a polymer and a macromolecule.

(b)[2]

DNA contains a sugar component that is a reducing sugar. Outline the test for reducing sugars and describe the observations for a positive result.

(c)[3]

Nucleotides act as structural units of nucleic acids. Each nucleotide is made up of a pentose sugar, a phosphate group and a nitrogenous organic base. Complete Table 5.1 to compare DNA nucleotides with RNA nucleotides as structural units of nucleic acids.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A polymer consisting of many repeating nucleotide subunits (a polynucleotide chain)” …

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