A-LevelBiologyNucleic acids and protein synthesis9700/21 · May/June 2020 · Q64 Marks
6 Fig. 6.1 shows the formation of a polypeptide during translation in a eukaryotic cell. [Figure 6.1]
- (a)Name the purine bases shown in Fig. 6.1.[1]
- (b)State the name given to the group of three bases found at J on the tRNA molecule.[1]
- (c)Identify the three bases at J.[1]
- (d)State how the three bases at J on tRNA interact with the bases on mRNA.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [1] adenine and guanine ;
- [1] anticodon ;
- [1] CAG / cytosine, adenine, guanine ; A GAC
- [1] hydrogen bonds form (between complementary bases) ;
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