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Principle of Classification. Variety of Life. Evolutionary relation and ‘ Natural’ Classification. Hierachy in classification I. Hierachy in Classification II. ‘Traditional’ Classification of Plants and Animals. Animal Kingdom Invertebrates Vertebrates. Plant Kingdom Non-flowering plant
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Principle of Classification • Variety of Life
‘Traditional’ Classification of Plants and Animals Animal Kingdom • Invertebrates • Vertebrates Plant Kingdom • Non-flowering plant • Flowering plant
Viruses • Non-cellular • Living or nonliving? • Primitive or Advanced? • ALL PARASITES • depend on host cells for reproduction and metabolism
Bacteriophage • Parasite of bacteria
Bacterial structure • Bacteria are the oldest life forms on earth, dating back about 3.8 billion years.
Bacterial flagellum unlike eukaryotic flagellum and cilium, does not have the internal 9+2 microtubules arrangement
Beneficial Bacteria: - Cheese making - Yogurt making - probiotic in GI tract
Harmful bacteria - Listeria in milk products - Salmonella in meat
Cyanobacteria - photosynthetic somewhat like algae, prokaryotic,, no chloroplasts
Binary fission in bacteria • The cell wall and membrane are in red, the bacterial chromosome in blue, the cytoplasm in light green. The yellow dot represents a point of attachment of the chromosome to the cell membrane.