Gce Model Questions Vol1 2024 Biology Question 34

Practice objective / multiple choice question 34 from the 2024 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2024 Biology Objective / Multiple Choice Medium Difficulty
Question 34 GCE_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • objective

A small gas molecule diffuses across a cell that is 10 µm thick. Its diffusion coefficient is D = 2.5 × 10⁻⁵ cm² s⁻¹. Using the one‑dimensional approximation t = x²/(2D), calculate the diffusion time in seconds. An active transporter can move the same molecule across the same distance at a constant speed of 5 µm s⁻¹. Determine the time required by active transport and state by what factor diffusion is faster than active transport.

Answer Options

A. Diffusion time = 0.05 s; active transport time = 2 s; diffusion is 40 times faster.
B. Diffusion time = 0.01 s; active transport time = 2 s; diffusion is 200 times faster.
C. Diffusion time = 0.02 s; active transport time = 1 s; diffusion is 50 times faster.
Correct Answer D. Diffusion time = 0.02 s; active transport time = 2 s; diffusion is 100 times faster.
Correct Answer
D
Correct Option:
Diffusion time = 0.02 s; active transport time = 2 s; diffusion is 100 times faster.

About This Question

This is Gce Model Questions Vol1 2024 Biology Question 34. It is one of the objective questions from the 2024 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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