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# Unit 2 Biology
- Tissues
- Organs
- Systems of living things
# Unit 2: Biology
## Cellular Biology
A person contains roughly 100 trillion cells
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`Eukaryotic cell`: Means complete nucleus
|Part Of Cell|Prokaryotic|Eukaryotic|
|Factors|Prokaryotic|Eukaryotic|
|:-----------|:----------|:---------|
|DNA|In nuclear region|Usually in membrane, bound nucleus|
|DNA|In nucleoid region|Usually in membrane-bound nucleus|
|Size|Usually smaller|Usually larger|
|Organelles|Not membrane-bound, smaller|Membrane-bound, more complex|
|Organization|Usually singlecelled|Often multicelled|
|Metabolism|May not need oxygen|Usually needs oxygen|
|Organization|Usually singlecelled|Often form multicellular organisms|
|Metabolism|May not need oxygen|Usually need oxygen|
## Cellular Organelles
### Cell Membrane
- Controls what substances enter/leave the cell selectively
- Controls what substances enter/leave the cell selectively via various receptors/osmosis
- Allows nutrients to enter
- Allows waste products to leave
- Surrounds and holds other organelles in cell
- Interact with outside chemicals (e.g., hormones)
### Nucleus
- Holds deoxyribonucleic acid (DNA) in form of chromatin