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Grade 10/Science/SNC2DZ/Unit 2: Biology.md
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# Unit 2 Biology # Unit 2: Biology
- Tissues
- Organs
- Systems of living things
## Cellular Biology ## Cellular Biology
A person contains roughly 100 trillion cells A person contains roughly 100 trillion cells
@ -17,21 +14,22 @@ A person contains roughly 100 trillion cells
`Eukaryotic cell`: Means complete nucleus `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| |Size|Usually smaller|Usually larger|
|Organelles|Not membrane-bound, smaller|Membrane-bound, more complex| |Organelles|Not membrane-bound, smaller|Membrane-bound, more complex|
|Organization|Usually singlecelled|Often multicelled| |Organization|Usually singlecelled|Often form multicellular organisms|
|Metabolism|May not need oxygen|Usually needs oxygen| |Metabolism|May not need oxygen|Usually need oxygen|
## Cellular Organelles ## Cellular Organelles
### Cell Membrane ### 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 nutrients to enter
- Allows waste products to leave - Allows waste products to leave
- Surrounds and holds other organelles in cell - Surrounds and holds other organelles in cell
- Interact with outside chemicals (e.g., hormones)
### Nucleus ### Nucleus
- Holds deoxyribonucleic acid (DNA) in form of chromatin - Holds deoxyribonucleic acid (DNA) in form of chromatin