As a result of transcription and translation, a polypeptide chain is produced. Proteins with quaternary structure contain two or more polypeptide chains. An antibody molecule and a haemoglobin molecule both show quaternary structure. (a) Table 6.1 shows some features of an antibody molecule and a haemoglobin molecule. Complete Table 6.1 to produce a summary of the features of the two molecules. Table 6.1 [Figure 6.1]

1. (a)Complete Table 6.1 to produce a summary of the features of the two molecules.[3]
2. (b)The base sequence shown in Fig. 6.1 is a short section of a longer length of DNA that is transcribed to produce mRNA. When translated, this short section produces the amino acid sequence threonine (Thr), proline (Pro), cysteine (Cys). Fill in the two unshaded boxes in Fig. 6.1 to show: • the mRNA codon for Cys • the tRNA anticodon for Thr. You do not need to give the codon and anticodon sequences in the shaded boxes. [Figure 6.1][2]

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