HSC Biology — Module 1
Fluid Mosaic Model — Flashcards & Quiz
The fluid mosaic model describes the structure of the cell membrane as a dynamic phospholipid bilayer embedded with proteins, cholesterol, and carbohydrates. Understanding why the membrane is described as both "fluid" (phospholipids move laterally) and "mosaic" (diverse proteins scattered throughout) is a core HSC Biology skill. Exam questions frequently ask you to draw and label a membrane diagram, explain selective permeability, or link membrane structure to its functions in transport and cell signalling.
Sample Flashcards
Q1: Describe the fluid mosaic model of the cell membrane.
The membrane is a phospholipid bilayer with proteins, cholesterol and carbohydrates embedded or attached. "Fluid" because components move laterally; "mosaic" because of the varied protein pattern.
Sample Quiz Questions
Q1: The cell membrane is described as "fluid" because its phospholipid and protein components can move laterally.
Answer: TRUE
The fluid mosaic model describes the membrane as fluid because phospholipids and some proteins can drift laterally within the bilayer.
Q2: Cholesterol makes the cell membrane more rigid and less fluid at normal body temperature.
Answer: FALSE
At normal body temperature, cholesterol actually acts as a fluidity buffer — it prevents the membrane from becoming too fluid. At low temperatures it prevents solidification. It does not simply make it rigid.
Related Concepts
Last updated: March 2026 · 1 flashcards · 2 quiz questions