Igcse Model Questions Vol1 2021 Biology Question 20

Practice objective / multiple choice question 20 from the 2021 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2021 Biology Objective / Multiple Choice Medium Difficulty
Question 20 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • objective

Glucose uptake by liver cells follows Michaelis‑Menten kinetics described by \( V = \frac{kI}{I+K_m} \), where \(V\) is the uptake rate (µmol min\(^{-1}\)) and \(I\) is the insulin concentration (µU mL\(^{-1}\)). Experimental data give \(V=120\) µmol min\(^{-1}\) at \(I=80\) µU mL\(^{-1}\) and \(V=180\) µmol min\(^{-1}\) at \(I=200\) µU mL\(^{-1}\). (a) Determine the constants \(K_m\) and \(k\). (b) Predict the uptake rate when the insulin concentration is \(150\) µU mL\(^{-1}\).

Answer Options

Correct Answer A. K_m = 100 µU mL⁻¹, k = 270; predicted uptake at I = 150 µU mL⁻¹ is V = 162 µmol min⁻¹.
B. K_m = 80 µU mL⁻¹, k = 300; predicted uptake at I = 150 µU mL⁻¹ is V = 150 µmol min⁻¹.
C. K_m = 120 µU mL⁻¹, k = 250; predicted uptake at I = 150 µU mL⁻¹ is V = 170 µmol min⁻¹.
D. K_m = 100 µU mL⁻¹, k = 260; predicted uptake at I = 150 µU mL⁻¹ is V = 158 µmol min⁻¹.
Correct Answer
A
Correct Option:
K_m = 100 µU mL⁻¹, k = 270; predicted uptake at I = 150 µU mL⁻¹ is V = 162 µmol min⁻¹.

About This Question

This is Igcse Model Questions Vol1 2021 Biology Question 20. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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