Biology B2

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

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                             

levels of complexity in multicelluar organisms:

CELL

 |

TISSUE

|

ORGAN

|

SYSTEM

  |

WHOLE BODY