2019-10-24 08:46:48 -04:00
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# Unit 2 Biology
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- Tissues
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- Organs,
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- Systems of living things
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## Celular Biology
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A person contains roughly 100 billion cells
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2019-10-24 08:51:45 -04:00
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- there are roughly to different types of cell s found in mammals
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- cells are roughly 20 $`\um`$ (micrometer, $`10^{-6}`$ m), around 250 cells / cm
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## Cell Theory
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1. All living things are composed of cells
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2. cells are the basic units of living organisms
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3. all cells came from pre-existing cells
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## Types Of Cells
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`Prokaryotic cell`: Meaning before/lacking
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`Eukaryotic cell`: Has organelles, meaning true, complete.
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|Part Of Cell|Prokaryotic|Eukaryotic|
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|:-----------|:----------|:---------|
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|DNA|In nucleoid region|Usually in membrane, bound nucleus|
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|Size|Usually smaller|Usually larger|
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|Organelles|No membrane, bound organelles|Membrane, bound organelle, the bigger, the more complex|
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|Organization|Usually singler celled|Often multicellular|
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|Metabolism|May not need oxygen|Usually needs oxygen to exist|
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