Neco 2019 Biology Question 23

Practice objective / multiple choice question 23 from the 2019 Neco Biology examination.

Neco 2019 Biology Objective / Multiple Choice Hard Difficulty
Question 23 NECO • 2019 • BIOLOGY • objective

An experiment measured the activity of a purified enzyme at different temperatures, yielding the following rates: \(10^{\\circ}C\): 20 units, \(20^{\\circ}C\): 45 units, \(30^{\\circ}C\): 70 units, \(40^{\\circ}C\): 55 units, \(50^{\\circ}C\): 30 units. Determine the optimum temperature for this enzyme, calculate the percentage decrease in activity at \(50^{\\circ}C\) relative to the optimum, and state the most likely biochemical reason for the decline at high temperature.

Answer Options

A. Optimum temperature = 20°C; activity at 50°C is 57.1% lower; decline due to product inhibition.
B. Optimum temperature = 30°C; activity at 50°C is 70.0% lower; decline due to pH shift.
Correct Answer C. Optimum temperature = 30°C; activity at 50°C is 57.1% lower; decline due to enzyme denaturation.
D. Optimum temperature = 40°C; activity at 50°C is 45.5% lower; decline due to substrate inhibition.
Correct Answer
C
Correct Option:
Optimum temperature = 30°C; activity at 50°C is 57.1% lower; decline due to enzyme denaturation.

About This Question

This is Neco 2019 Biology Question 23. It is one of the objective questions from the 2019 Neco Biology examination.

Difficulty level: Hard .

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