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CAIE A Level Biology 9700 · Nucleic acids and protein synthesis

Nucleic acids and protein synthesis: describe question

Describe5 marksChallenge

The table shows the base composition of a DNA template strand and the mRNA transcribed from it. The percentages of adenine, guanine, and thymine in the DNA are given, and the percentages of cytosine and uracil in the mRNA were not recorded.

MoleculeAdenine (%)Guanine (%)Cytosine (%)Thymine (%)Uracil (%)
DNA template strand242626240
mRNA2426?0?

Using the data provided, describe the structures of DNA and RNA, and explain how the data demonstrates complementary base pairing.

0 words · 5 marks

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How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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