WJEC A Level Biology
WJEC A Level Biology 1.3 Cell Membranes and Transport Exam Questions
Free WJEC A Level Biology exam questions on 1.3 Cell Membranes and Transport, with mark schemes. Covers the fluid mosaic model, diffusion, osmosis, active transport and bulk transport.
1.3 Cell Membranes and Transport exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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WJEC A Level Biology Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About WJEC A Level Biology 1.3 Cell Membranes and Transport
This topic explains how substances move into and out of cells. Water potential questions are common.
What you need to know
- Fluid mosaic model Phospholipid bilayer with intrinsic and extrinsic proteins, cholesterol and glycoproteins.
- Passive transport Diffusion, facilitated diffusion and osmosis down a gradient.
- Water potential Water moves from higher (less negative) to lower (more negative) water potential. Plasmolysis and turgor in plant cells.
- Active and bulk transport Active transport uses ATP; endocytosis and exocytosis move large molecules.
Common mistakes in 1.3 Cell Membranes and Transport
- Saying water moves to a higher water potential.
- Claiming facilitated diffusion uses ATP.
- Confusing plasmolysis with lysis.
Try three 1.3 Cell Membranes and Transport exam-style questions
1. Define water potential. (2 marks)
Show the mark scheme answer
The tendency of water to move out of a system (1), measured in kPa, with pure water at 0 (1).
2. Explain what happens to a plant cell placed in a concentrated salt solution. (3 marks)
Show the mark scheme answer
The solution has a lower water potential (1), so water leaves the cell by osmosis (1) and the cytoplasm pulls away from the cell wall, plasmolysis (1).
3. Explain why active transport needs ATP. (1 mark)
Show the mark scheme answer
ATP provides energy to change the shape of the carrier protein to move substances against a concentration gradient.
1.3 Cell Membranes and Transport FAQs
What does Cell Membranes and Transport cover?
Membrane structure and all methods of transport across membranes.
Which practicals link here?
Determining the water potential of a plant tissue and investigating membrane permeability.
How is water potential calculated?
Water potential = solute potential + pressure potential.
Revise this topic with flashcards: WJEC A Level Biology Flashcards, with mark scheme answers for Anki and Quizlet.
