9700 · 4.1
Fluid mosaic membranes — FAQ
Frequently asked questions for 9700 Fluid mosaic membranes. Direct answers first, then deeper explanation — then practise with marking.
What is the primary function of the fluid mosaic membrane in cells?
The primary function is to regulate the movement of substances into and out of the cell, maintaining homeostasis. It also plays critical roles in cell signalling, adhesion, and recognition. You can deepen your understanding by exploring our free Cambridge Biology 9700 course content and practising with past papers.
How does temperature affect the fluidity of a cell membrane?
At higher temperatures, phospholipids gain kinetic energy, increasing membrane fluidity. At lower temperatures, fluidity decreases, potentially making the membrane too rigid. Cholesterol, found in animal cells, helps buffer these changes, maintaining optimal fluidity. Our premium lessons dive deeper into these effects and provide past paper questions to test your knowledge.
Why is the term 'mosaic' used to describe cell membranes?
The term 'mosaic' refers to the scattered and irregular arrangement of various proteins embedded within or attached to the phospholipid bilayer, much like tiles in a mosaic artwork. These proteins are not uniformly distributed but form a diverse pattern essential for specific functions. Learn more about membrane proteins and their roles in our free 9700 Biology revision series, complete with detailed explanations and practice questions.