Paper 2 · biological molecules - proteins

Fig 1.1 is a diagram of protein tertiary structure. The bond labelled B forms by weak electrostatic attraction between a hydrogen atom carrying a partial positive charge and an electronegative atom (such as oxygen or nitrogen) on a nearby R-group. Bond B is best classified as a...

ADisulphide bond

BHydrogen bond

CIonic bond

DPeptide bond

Explanation: A hydrogen bond forms when a hydrogen atom bonded to an electronegative atom (giving it a partial positive charge) is weakly attracted to another electronegative atom nearby, which is exactly the interaction bond B 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 B forms by weak electrostatic attraction between a hydrogen atom carrying a partial positive charge and an electronegative atom (such as oxygen or nitrogen) on a nearby R-group. Bond B is best classified as a...

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