A-LevelBiologyBiological moleculesOct/Nov 2020Paper 1 Q101 Mark
Which row about the structure of proteins is correct? [Figure 10.1]
Aprimary structure: is the number of amino acids present in a protein, tertiary structure: is the result of cross bonding between all the amino acids in the primary structure, quaternary structure: is the polypeptides that link together to form a protein
Bprimary structure: is the order of amino acids present in a protein encoded by DNA, tertiary structure: is the shape formed by folding of a polypeptide and held together by hydrogen bonds, quaternary structure: contains two types of polypeptide that interact forming the shape of a protein
Cprimary structure: is the result of translation of an mRNA molecule by a ribosome into a chain of amino acids, tertiary structure: is the result of ionic and hydrogen bonds, disulfide bridges and hydrophobic interactions between amino acids, quaternary structure: is formed by four polypeptides and an additional reactive group attached to the protein
Dprimary structure: is the sequence of amino acids in a protein coded by an mRNA molecule, tertiary structure: is formed as a result of interaction of the side chains of amino acids in the primary structure, quaternary structure: is formed by the linking together of more than one polypeptide to form a protein
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The correct answer is D. This question tests the candidate's understanding of biological molecules within the Biologysyllabus. The examiner's mark scheme requires...
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