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GCSE Biology Cell Biology Revision Slides

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A full set of revision slides for GCSE Biology Cell Biology Topic (Unit 1) for AQA. Each presentation contains a title page, detailed slides covering all content required for the AQA syllabus. All necessary practical and maths skills are covered. Most presentations include past paper questions with...

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  • July 9, 2024
  • 26
  • 2023/2024
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GCSE Biology – Unit 1 – Cell Biology
Transport in Cells #2: Osmosis & Active Transport
Learning Objectives:

• To define Osmosis and use
the terms dilute solution and
concentrated solution

• Understand the effects of
osmosis on animal and plant
cells

• Learn how sports drinks
relate to osmosis

• Understand active transport
and recall examples in nature

• Compare diffusion, osmosis
and active transport

, Cell Membranes
• The membrane of a cell allow substances to move in and out of the cell

• Organisms need to exchange substances across their cell membranes in order to
function correctly

• Cells need to take up food (e.g. glucose) and get rid of waste products (e.g. urea)

• There are 3 methods of transport across a cell membrane:

• Diffusion Cell Membrane

Glucose
• Osmosis
Oxygen CO2
• Active Transport

Amino Urea
acids


Minerals

, Osmosis
• The movement of water into and out of a cells happen by osmosis

• Osmosis can be defined as:

‘The diffusion of water from a dilute solution to a concentrated solution through a
partially permeable membrane’

• A partially permeable membrane is one that lets some substances through (e.g.
water, oxygen, carbon dioxide etc.) but not others (e.g. glucose, sucrose)

• Water always moves from a dilute solution to a concentrated solution.

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