Table 5.1 gives the base triplets on the DNA template polynucleotide for some amino acids. Fig. 5.1 displays the DNA and mRNA base sequences for the first seven amino acids in the b chain of haemoglobin.
(a(i))[3]
Use Table 5.1 so as to complete Fig. 5.1.
(a(ii))[1]
State the term used to describe the order of amino acids in a polypeptide.
(b)[5]
In sickle cell anaemia, valine is found at position 6 in the b chain instead of glutamic acid. Explain how one change in the DNA triplet for the sixth amino acid in the gene coding for the b chain results in the formation of a different amino acid sequence.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “GTG” …