Post on 25-Dec-2015
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Cell Theory
1) Cells are the basic units of structure & function in living organisms.
2) All living organisms are composed of 1 or more cells.
a. Schleiden: all plants composed of cellsb. Schwann: all animals composed of cells
3) All cells come from preexisting cells.a. Virchow contributed this.
Prokaryotes• First life form: Archaea & Bacteria• Note cell wall & cytoplasmic membrane• No membrane-bound organelles• DNA in nucleoid• Ribosomes present
• Errors in figure• Flagellum, singular• Cytosol
Eukaryotes• Protists, Fungi, Plants, & Animals• Have membrane-bound organelles• Nucleus with nucleolus• Endoplasmic reticulum: rough & smooth• Golgi apparatus• Mitochondrion• Chloroplasts, Chromoplasts, & other plastids• Vacuoles: plants’ 1 central vacuole; animals- many • Vesicles: lysosomes, peroxisomes, glyoxysomes
Things to know for the Exam
• Cell types• Structure-function relationship• Form follows function.• Size varies greatly.• Organelles specific for animals vs. plants• Function of all organelles.• Plasma membrane structure & function.