Biology B2

Animal and plant cells

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  • Created by: siobhan
  • Created on: 29-11-12 20:57

Animal and plant cells

MOST CELLS HAVE:

  • a nucleus to control the cells activitie
  • cytoplasm where many chemical reactions take place
  • a cell membrane that controls the movement of material in and out of the cell
  • mitochondria where energy is released during aerobic respiration
  • ribosomes where protein synthesis takes place

PLANT AND ALGAL CELLS ALSO HAVE:

  • a rigid cell wall made of cellulose for support
  • chloroplasts that contain cholorphyll for photosynthesis- the cholorplasts absorb light energy to make food
  • a permanent vacuole containing cell sap
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Bacteria and yeast

BACTERIA:

  • have a cell membrane and a cell wall which surround cytoplasm
  • have no nucleus- genetic material is in the cytoplasm
  • multiply to form a colony which can be seen by the naked eye 

YEAST:

  • is a single-celled organism
  • have a nucleus, cytoplasm and a membrane surrounded by a cell wall      (http://t1.gstatic.com/images?q=tbn:ANd9GcQ3-7LkThbOYQEoQuJiJHwht2HPYwRD8sZbRIGPK0_D21tWBqbj)                       
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tissues and organs

levels of complexity in multicelluar organisms:

CELL

 |

TISSUE

|

ORGAN

|

SYSTEM

  |

WHOLE BODY 

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Comments

Luisa Ruggiero

Check my recent update work of georaphy river landscapes/landforms revision, hope it helps

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