what is a cell?

what is a cell?

1. bacteria

   • flexible cell wall, do not have a nucleus, two types of DNA, plasmid ans chromosomal
     • some have flagellum, tails that help them move

2. just plants

   • cell wall
     • strengthens cell
   • chloroplasts
     • contain chlorophyll which absorb light enegy for photosynthesis
   • permanent vacuole
     • filled with cell sap to keep the cell turgid

3. animals and plants

   • nucleus
     • controlls cell activity, contains genetic info
   • cytoplasm
     • most chemical processes take place here controlled by enzymes
   • cell membrane
     • controls movement of substances in and out of cells
   • mitochondria
     • most energy is released by respiration here
   • ribosomes
     • protein synthesis happens here

4. microscopes

   • created in 1590
     • used for aprox 350 years
     • by Hans, Janssen and Zacharias
     • light microscopes magnify x 1,500
     • electric microscopes magnify x 2 million
     • length of object = length of magnified object / magnification

5. all have a nucleus, cell membrane cytoplasm, mitochondria, and ribosoms