B1

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  • Created by: gyat
  • Created on: 26-05-19 09:17

1. Active transport

  • Molecules diffuse from an area of high concentration to an area of low concentration. No energy required
  • When the concentration of a material is lower outside the cell t must be actively transported into a cell
  • The diffusion of water molecules from an area or high water concentartion to an area of low concentration through a selectivity permeable membrane
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2. Light microscopes

  • Allow you to see the image as light passes through it. Magnifies image by X1000
  • Uses beam of electrons. Magnifies image by X50,000,000. Can only study dead cells

3. Organ

  • Groups of similar cells with a similar function
  • A number of organs working together to carry out specific functions
  • Several tissues performing specific function
  • Cells differentiate to cells with a specific function E.G muscle cells

4. Function of a cell membrane

  • Contains chromosomes which carry genetic genetic information and controls the activities of the cell.
  • Controls substances entering and leaving the cell
  • Where most chemical reactions take place
  • Contains cellulose; it supports the plants structure

5. Organ System

  • Cells differentiate to cells with a specific function E.G muscle cells
  • Several tissues performing specific function
  • A number of organs working together to carry out specific functions
  • Groups of similar cells with a similar function
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