CELLS: UNITS OF LIFE. Chapter 4 Hyperlink is the 3 rd one that says component of cells – same as above, but narrated!. The Discovery of Cells. All organisms consist of cells. The Discovery of Cells. Cells – the place where biochemical activity occurs. The Discovery of Cells.
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Hyperlink is the 3rd one that says component of cells – same as above, but narrated!
1. All living things are composed of cells. [Schleiden & Schwann]
2. All cells come from preexisting cells. [Virchow]
Cell Theory still evolving: Organelles have precise locations in cells
C. Types of Cells
3 basic types:
Review surface area to volume relationship – Large volume justifies the need to have organelles
Folding membranes also increase surface area for reactions
Ex. bacteria & cyanobacteria
Distinguishes 2 types of bacteria
Structure of a Gram-Negative Cell Wall
Gram positive cell wall
Ex. Extremophiles: extreme environments: temp, pressure, pH, salinity
methanogens, extreme halophiles & extreme thermophiles
Animal Cell Plant Cell
interconnected network of membranes extending from nucleus to plasma membrane
Proposes that chloroplasts and mitochondria evolved from once free-living bacteria engulfed by larger archaea.
Based on fact that mitochondria & chloroplasts resemble certain bacteria (size, shape, membrane structure & method of making proteins).