Chapter 27

Chapter 27 - Chapter 27 Prokaryotes classification o...

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Chapter 27- Prokaryotes - classification o kingdom archaea and eubacteria o Domain: Bacteria o Domain: archaea o Shapes: Cocci (sphere) Bacilli (rod) Helical (spiral) o Structural characteristics Cell wall – peptidoglycan (sugars and proteins Gram + = w/ peptidoglycan penicillin action o P 3 = positive, peptidoglycan, purple o Can be killed with penicillin Gram - : little peptidoglycan, lipopolysaccharides; most pathogens; impede drug action o Hard to get rid of Capsule: adherence, protection Pilis: adherence; conjugation - Motility o 1. Flagella o 2. helical shape (spirochetes) o 3. slime o 4. taxis (movement away or toward a stimulus) - Form and function o Nucleoid region Genophore: non- eukaryotic chromosome Plasmids o Asexual reproduction: Binary fission Not mitosis o Sexual reproduction Not meiosis Transformation Uptake of gene from surrounding environment Conjugation Direct gene transfer from one prokaryote to another
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Chapter 27 - Chapter 27 Prokaryotes classification o...

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