ESAT (Engineering and Science Admissions Test) · Biology

Enzymes

8 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 8 questions

A competitive inhibitor is added to an enzyme-catalysed reaction. Which statement is correct?
The rate of an enzyme-catalysed reaction rises as substrate concentration increases, then levels off. Why does it level off?
An enzyme converts $12 cm^{3}$ of substrate to product in $30 s$ at a steady rate. How much product forms in $2.5$ minutes at the same rate?
Why does an enzyme-catalysed reaction stop speeding up at very high temperatures?
The rate of an enzyme-catalysed reaction doubles for every $1 0^{\circ} C$ rise (below the optimum). At $2 0^{\circ} C$ the rate is $5 units/min$ . What is the rate at $4 0^{\circ} C$ ?
Which change is most likely to occur to an enzyme at a pH far from its optimum?
Which statement describes the induced-fit model of enzyme action?
The rate of an enzyme-catalysed reaction is $6.0 units/min$ at $2 0^{\circ} C$ and $18.0 units/min$ at $3 0^{\circ} C$ . What is the temperature coefficient $Q_{10}$ ?

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