CAIE A Level Biology 9700 · Nucleic acids and protein synthesis
A laboratory assistant is asked to identify whether a sample contains DNA nucleotides or ATP molecules. Explain two similarities and two differences in the structure of a DNA nucleotide and an ATP molecule that could help distinguish them.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.