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Characteristics of Life
A study of the cell And its structures
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Characteristics of Life
Organization- cells as basic unit Metabolic activity use and acquire energy Reproduction asexual sexual Homeostasis: day to day survival
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Characteristics of Life con’t.
Growth and development Responds to environment Reaction to the environment Change through time (evolution) 1- genetic variation 2- natural selection 3- adaptation
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Cell Theory- origins Robert Hooke’s discovery Cork cells
Only looked at dead cells The microscope (intro) Van Leeuwenhoek Two types Simple Compound Schleiden- plants are made of cells Schwann- animals are made of cells also
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Cell Theory 1- Cells are the basic unit of life Structure Function
2- All living organisms are made of cells 3- All cells come from pre-existing cells
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Two Cell types Prokaryotes and Eukaryotes Both have cell coverings
a. cell wall and/or b. plasma membrane Cytoplasm Simple organelles For example ribosomes Metabolic comparisons Genetic material: DNA (rarely RNA)
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Prokaryotes primitive, “before; nucleus” 1- Example 2- Basic structure
3- Type of reproduction
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Eukaryotes advanced, “true; nucleus” 1- Example 2- Basic structure
3- Type of reproduction 4- Animal vs Plant cells
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Prokaryote vs Eukaryote
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Viruses Alive or not? Lytic cycle Latent cycle
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