Paper 2 · biological molecules - proteins

Fig 1.1 is a diagram of protein tertiary structure. The bond labelled A forms by electrostatic attraction between two oppositely charged R-group (side chain) groups on the folded polypeptide chain. Bond A is best classified as a...

ADisulphide bond

BHydrogen bond

CIonic bond

DPeptide bond

Explanation: An ionic bond in protein tertiary structure forms by electrostatic attraction between R-groups carrying opposite charges (e.g. a negatively charged -COO- group and a positively charged -NH3+ group), which is exactly the interaction bond A represents in Fig 1.1.

Derived from ZIMSEC Biology Paper 2, November 2009, Q1

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Fig 1.1 is a diagram of protein tertiary structure. The bond labelled A forms by electrostatic attraction between two oppositely charged R-group (side chain) groups on the folded polypeptide chain. Bond A is best classified as a...

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