This question examines how DNA and RNA are structured and what they do in protein synthesis.
(a)[1]
Which of the three molecules, $J$, $K$ and $L$, could serve as a building block of a protein? Explain your response.
(b)[4]
Outline the separate roles of mRNA and tRNA in the synthesis of a protein with a defined primary structure.
(c)[3]
Suggest and explain how a change in the primary structure of the protein would influence its overall structure and function.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Compound L is identified as the sole amino acid; it can form peptide links and has N and COOH” …