The Structure of Cells
Cells can be classified as either unicellular (bacteria and archaea) or multi-cellular (plants and animals). Different types of cells with different functions can exist within one organism.
Top image: TEM of a longitudinal thin section of a dividing Escherichia coli bacterium (prokaryote). The centrally located nucleoid is prominent.
Bottom image: TEM showing a central longitudinal section of a unicelluar green alga Chlamydomonas reinhardtii (eukaryote). Internal membranes of different types of organelles can be clearly seen, including a pyrenoid surrounded by starch granules within the cup-shaped chloroplast, Golgi organelles, mitochondria and the nucleus.
- Campbell, N.A., and J.B. Reece. (2008). Biology, 8th Edition. San Francisco, CA: Pearson Benjamin Cummings.
- TEM of E. coli by James D. Jamieson, MD, PhD. George E. Palade EM Slide Collection. Department of Cell Biology, Yale University School of Medicine/The Cell: An Image Library. CC-BY-NC-SA 3.0.
- TEM of C. reinhardtii by I. Ohad. George E. Palade EM Slide Collection. Department of Cell Biology, Yale University School of Medicine/The Cell: An Image Library. CC-BY-NC-SA 3.0.
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