Biology 2 0.0 / 5 ? BiologyCells, tissues and organsGCSEEdexcel Created by: tom1234567!Created on: 22-10-16 13:02 what is the cell membrane? it controls what enters and what leaves the cell e.g. oxygen 1 of 14 what is the nucleus? a large structure that contains DNA-and then instructions for building and working the cell 2 of 14 what is the cytoplasm? a jelly like substance that fills the cell ; many reactions take place here 3 of 14 what are mitochondria? tiny structures where respiration takes place, releasing energy for cell processes 4 of 14 what are chloroplasts? they are the structures where photosynthesis take place to make food for the plant (plants) 5 of 14 what is the cell wall for? the cell wall is made of cellulose and is tough so that it helps support the cell and keep it in shape (plants) 6 of 14 what is the central vacuole? it contains cell sap to keep the plant cell rigid (plants) 7 of 14 BACTERIA BACTERIA 8 of 14 what is bacteria? a simple cell structure like animal and plant cells they have cell membrane surrounding the cytoplasm but do not have a nucleus 9 of 14 what is inside bacteria? a single loop of chromosomal DNA lies free in the cytoplasm. flagellum . cell wall. plasmid DNA (additional genes) 10 of 14 when was microscopes invented? 350 years ago 11 of 14 what does a light microscope do? it uses light to magnify objects, it greatest possible magnification is x2000 12 of 14 what is an electron microscope? uses electrons to view an object x10 million better than light microscope 13 of 14 Formula for magnification magnification of eyepiece X magnification of objective 14 of 14
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