(a)[1]
Explain why no phosphodiester bonds are shown in Fig. 3.1.
(b)[4]
Identify and describe the DNA-RNA nucleotide pair displayed in Fig. 3.1. If you want, you may add labels and annotations to Fig. 3.1.
Biology 9700 · AS & A Level · Structure of nucleic acids and replication of DNA
Structure of nucleic acids and replication of DNA — practice question
In transcription, nucleotides pair by complementary base pairing. Fig. 3.1 is a diagram that illustrates complementary base pairing between a DNA nucleotide and an RNA nucleotide. At molecular detail, only the base pair is shown.
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This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “An explanation that phosphodiester bonds form between adjacent nucleotides to create a sugar-phosphate backbone, so more than one nucleotide is needed” …
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