biology- IGCSE chapter 1

biology- IGCSE chapter 1

1. cell structures

   • animal cells
     • mitrochondria
       • Where respiration takes place
     • nucleous
       • where dna is stored
     • cytoplasm
       • gives the cell its shape
     • cell membrane
       • controls what enters and leaves the cells (by diffusion
   • plant cells (includes all from animal cells with 3 exceptions)
     • cell wall
       • effects the shape of cell
     • vacule
       • contains watery sap
     • chloroplasts
       • where PHS takes place

2. enzymes

   • are Biological catalysts
   • they speed up chemical reactions
   • the way they go together is a lock and key method
   • the temperature and the PH matter for the speed of reaction
   • 37 degrees is the optimum temp and PH 7 is the optimum PH
   • They're proteins