Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

12 questions

SA-OB-EN-0011 markL1 FoundationCalculatorEnzyme action

Enzymes are made of

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0021 markL1 FoundationCalculatorEnzyme action

The part of the enzyme where the substrate binds is the

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0121 markL1 FoundationCalculatorEnzyme action

A catalyst

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SA-OB-EN-0031 markL2 StandardCalculatorTemperature and pH

Above its optimum temperature, an enzyme's activity falls because

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0041 markL2 StandardCalculatorEnzyme action

Enzymes are specific because

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0051 markL2 StandardCalculatorTemperature and pH

The optimum pH of pepsin in the stomach is about

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0061 markL2 StandardCalculatorTemperature and pH

5\,^\circ\mathrm{C}

, enzyme activity is low because

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0072 marksL2 StandardCalculatorRates

Starch is completely digested in

50

s. Calculate the rate as

\frac{1}{\text{time}}

\text{s}^{-1}

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0082 marksL2 StandardCalculatorRates

An enzyme produces

30\ \text{cm}^3

of oxygen in

2

minutes. Calculate the mean rate in

\text{cm}^3

per minute.

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SA-OB-EN-0091 markL2 StandardCalculatorEnzyme action

The temporary structure formed when a substrate binds is the

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0101 markL2 StandardCalculatorTemperature and pH

An enzyme heated to

80\,^\circ\mathrm{C}

and then cooled to

37\,^\circ\mathrm{C}

will

Salam Academy Original Practice · Proposed mark scheme

SA-OB-EN-0111 markL3 ExamCalculatorTemperature and pH

Raising the temperature from 20 to 30 °C doubles the rate of an enzyme reaction. The best explanation is

Salam Academy Original Practice · Proposed mark scheme