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Lecture 6 - Bacteria and Archaea - LECTURE 6 Bacteria and...

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LECTURE 6 - Bacteria and Archaea A. Common Characteristics (Table 23-2) 1. Prokaryotic No organelles (membrane-bound structures; ribosomes not included), no true nuclei, simple cytoskeleton Bacteria have very tiny actin-like filaments just beneath the cell membrane that help it maintain a shape; it’s not as complex as ours 2. No mitosis- fission We have mitosis because the cytoskeleton helps it; bacteria have a simple cytoskeleton and only one chromosome (no homologous; we have 23 homologous) and are 1N (haploid). They still have to double the chromosome and split it between two cells - fission 3. No meiosis- single chromosome Meiosis is reduction division, in order for us to reproduce sexually we can’t have our children with doubled chromosomes (our gametes are 1N) Bacteria have no meiosis because they only have one chromosome 4. Size Prokaryotes are the smallest cells (1-10 micrometers) Eukaryotes larger (10-100 micrometers) Eukaryotic infections include ringworm (fungi) 5. Unicellular- each cell is fully viable Single-celled; the cells are individual organisms unlike ours This is because one of our single cells would not be able to survive on its own; they are more specialized 6. Habitat Grow everywhere; inhabit every environment (even rocket fuel) This is because of their nutrition 7. Nutrition a. Autotrophs 1) Photosynthetic autotrophs – take inorganic chemicals and can make food out of them Can be aerobic, which means they will produce oxygen
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