B1- Cells and Microscopy 0.0 / 5 ? BiologyCell Level SystemsGCSEOCR Created by: EvieWongCreated on: 16-04-18 18:19 Eukaryotes Eg: plants, animals Made from complex cells Made of eukaryotic cells Contain sub-cellular structures 1 of 12 Prokaryotes Eg: Bacteria Smaller, simpler cells Made from prokaryotic cells Contain sub-cellular structures 2 of 12 Nucleus Contains DNA in the form of chromosomes Controls cell's activities Present in animal cells and plant cells 3 of 12 Cytoplasm Gel-like substance Where most of the chemical reactions occur Present in animal and plant cells 4 of 12 Mitochondria Site of cellular respiration Breaks down nutrients from the cell and turns them into energy Contain enzymes needed for the reactions involved in respiration Singular- mitochondrion Present in animal and plant cells 5 of 12 Cell Membrane Holds the cell together Controls what goes in and out of the cell A selectively permeable membrane Contains receptor molecules that are used for cell communication Present in animal and plant cells, and bacteria 6 of 12 Cell Wall Made of rigid cellulose Gives the cell support Present in plant cells and bacteria 7 of 12 Chloroplasts Contain green chlorophyll Where photosynthesis occurs Present in plant cells 8 of 12 Chromosomal DNA One long circular chromosome Controls the cell's activities and replication Floats freely in the cytoplasm Present in bacteria 9 of 12 Plasmid Small circular loop of extra DNA Not part of the chromosome Contain genes for things like drug resistance Can be passed between bacteria Present in bacteria 10 of 12 Electron Microscopes Invented in the 1930s Let us see smaller things in more detail (eg: internal structure of mitochondria, viruses, plasmids) Allows us to have a greater understanding of sub-cellular structures 11 of 12 Transmisson Electron Miscroscopes TEMs Higher magnification and resolution than light microscopes Not portable Expensive Complicated process to prepare specimens for use Can't be used to look at living tissue 12 of 12
Comments
No comments have yet been made