Cell Biology

  • Created by: pladoo
  • Created on: 22-10-19 15:53


Cells – topic one

Structure of different cells


  • nucleus
  • cytoplasm
  • mitochondria 
  • ribosomes
  • cell membrane


  • Nucleus
  • cytoplasm
  • chloroplast
  • cell membrane
  • vacuole
  • cell wall
  • ribosomes
  • mitochondria

Microscope and magnification

Magnification – the act or process of enlarging an image of a physical object    

Resolution – The shortest distance between two points in a specimen that can still be distinguished by the observer

Laser imaging -  laser imaging combines high-resolution optical images with depth salacity which allows us to view tiny structures.

Why are microscopes useful?

  • Helps us see microorganisms and discover new microscopic species
  • Can be used to make medicine
  • To investigate cell structure


Calculations for magnifying

I = Actual x Magnification

A = Image / magnification

M = Image / actual

Properties of different microscopes.

Light microscopes

  • light 
  • 2000x
  • colour
  • cheap, easy to use, detailed
  • 2D

Electron microscopes

  • Electron
  • 2,000,000x 
  • Black and white
  • very informative, very accurate, very detailed 3D or 2D
  • Expensive, hard to operate

Exam practical

Using a light microscope to identify a cheek cell.

By preparing a slide from a swab of cheek cells.

Then looking through a microscope at

Mitosis and meiosis

  • Diploids – 46 chromosomes
  • Haploids – 32
  • 2 haploids = diploid
  • Gametes – Sex cells
  • Cytokinesis – the process of separating the cells.


  • The parent the cell has reached its full size and is ready


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