Gce Model Questions Vol1 2023 Biology Question 33
Practice objective / multiple choice question 33 from the 2023 Gce Model Questions Vol1 Biology examination.
A cell membrane has a passive diffusion permeability coefficient \(P = 2.0 \times 10^{-5}\ \text{cm s}^{-1}\) for solute X. The external concentration is \(0.8\ \text{mM}\) and the internal concentration is \(0.2\ \text{mM}\). The membrane surface area is \(A = 1.5 \times 10^{-3}\ \text{cm}^{2}\). In addition, a carrier‑mediated active transport system can move up to \(5.0 \times 10^{-12}\ \text{mol s}^{-1}\) against the gradient, but it operates only when the internal concentration exceeds \(0.5\ \text{mM}\). Calculate the net rate of X entering the cell (in mol s\(^{-1}\)) under the given conditions.
Answer Options
About This Question
This is Gce Model Questions Vol1 2023 Biology Question 33. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Biology examination.
Difficulty level: Medium .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.