Neco Model Questions Vol1 2022 Biology Question 20

Practice objective / multiple choice question 20 from the 2022 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2022 Biology Objective / Multiple Choice Medium Difficulty
Question 20 NECO_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

A semi‑permeable membrane has a permeability coefficient (P = 1.2\times10^{-5}\,\text{cm/s}\), an area (A = 2\,\text{cm}^2\), a thickness (L = 0.01\,\text{cm}\), and a concentration difference across it of \(\Delta C = 0.05\,\text{mol/cm}^3\). Using Fick's law \(J = \frac{P A \Delta C}{L}\), calculate the rate of diffusion (J\) in mol/s. An active transport pump in the same membrane can move (2\times10^{-6}\,\text{mol/s}\). State which mechanism transports solute faster and by what factor.

Answer Options

A. Diffusion rate = 6.0×10⁻⁵ mol\/s; diffusion is ~30 times faster than active transport
Correct Answer B. Diffusion rate = 1.2×10⁻⁴ mol/s; diffusion is ~60 times faster than active transport
C. Diffusion rate = 2.4×10⁻⁴ mol\/s; diffusion is ~120 times faster than active transport
D. Diffusion rate = 1.2×10⁻⁵ mol\/s; diffusion is ~6 times faster than active transport
Correct Answer
B
Correct Option:
Diffusion rate = 1.2×10⁻⁴ mol/s; diffusion is ~60 times faster than active transport

About This Question

This is Neco Model Questions Vol1 2022 Biology Question 20. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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