A-LevelBiologyNucleic acids and protein synthesisOct/Nov 2021Paper 1 Q221 Mark
A piece of a DNA molecule contains 84 base pairs. The table shows the number of adenine and cytosine bases in one or both of the DNA strands in this piece of DNA molecule. [Table showing base counts for adenine and cytosine in strand 1 and strand 2] How many guanine bases are present in this piece of DNA molecule?
A18
B33
C36
D41
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The correct answer is B. This question tests the candidate's understanding of nucleic acids and protein synthesis within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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