Diana Carvajal August 2014 LeaYe9b6DpWQa5EnlY_oZHbJGcx_00w

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Presentation transcript:

Diana Carvajal August LeaYe9b6DpWQa5EnlY_oZHbJGcx_00w ER=OTHER Developments in scientific research follow improvements in apparatus—the invention of electron microscopes led to greater understanding of cell structure.

Microscopes! Electron microscopes have a much higher resolution than light microscopes.

1. Molecules (1nm). 2. Cell membrane thickness (10nm). 3. Virus (100nm). 4. Bacteria (1um). 5. Organelles (less 10um). 6. Cells (<100 um). 7. Generally plant cells are larger than animal cells. nm = nanometer μm = micrometer

Absence of organelles. There is no true nucleus. Some bacteria have flagellum.

Ultrastructure of E. coli. Drawing of the ultrastructure of prokaryotic cells based on electron micrographs Prokaryotes have a simple cell structure without compartmentalization. (With naked DNA) 70S

What are the functions of these prokaryotic cell parts?

Binary fission: Asexual method of reproduction. The cells produced are genetically identical (clones). Prokaryotes divide by binary fission

Drawing of the ultrastructure of eukaryotic cells based on electron micrographs Eukaryotes have a compartmentalized cell structure. Eukaryotic cell

Which structures can you identify in this false- coloured TEM (transmission electron microscopy) image?

Electron micrographs of liver cells.

Magnification x47,500 at 10X8 cm size.

Magnification x47,500 at 10X8 cm size. Nucleus Nuclear membrane mitochondria endoplasmic reticulum (ER) ribosomes Electron micrographs of liver cells.

What are the differences between prokaryotic and eukaryotic cells? Comparison of prokaryotic and eukaryotic cells

Identify structures in electron micrographs of E. coli