10 Questions
What is the structure of the cell membrane according to the fluid-mosaic model?
Phospholipid bilayer interspersed with proteins and other substances
What do the hydrophilic heads of the phospholipid molecules in the cell membrane point outward towards?
Water on each side
What is the function of the phospholipid bilayer in the cell membrane?
Allows lipid-soluble substances to enter and leave
What is the main process through which water moves across a cell membrane?
Osmosis
Which process requires energy to move substances across the cell membrane against their concentration gradient?
Active transport
What is the structure of the cell membrane according to the fluid-mosaic model?
Phospholipid bilayer interspersed with proteins
What is the primary function of the phospholipid bilayer in the cell membrane?
Allows lipid-soluble substances to enter and leave
Which process involves the movement of water across a selectively permeable membrane?
Osmosis
What distinguishes facilitated diffusion from simple diffusion?
Requires the assistance of transport proteins
Which statement best describes the function of active transport in the cell membrane?
Moves substances against their concentration gradient
Test your knowledge of transport across membranes with this quiz. Based on the AQA Biology AS and A2 student's books, this quiz covers topics such as diffusion, osmosis, and active transport. See how well you understand the concepts presented in the lecture notes and textbooks.
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