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Update Unit 2: Biology.md

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Daniel Chen 2019-10-31 15:06:12 +00:00
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Grade 10/Science/SNC2DZ/Unit 2: Biology.md
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@ -147,3 +147,34 @@ A person contains roughly 100 trillion cells
- Maintains cell shape and resistance - Maintains cell shape and resistance
- Plant cells that lack turgor pressure (e.g., celery left in fridge) become flaccid - Plant cells that lack turgor pressure (e.g., celery left in fridge) become flaccid
## Cell division
### Purpose
#### Growth
- Cells have maximum size before transportation of substances within cell becomes inefficient
- Cells transport chemicals (e.g., nutrients) via `diffusion`
#### Reproduction
- Single-cellular organisms reproduce via division asexually
- Multicellular organisms reproduce via combining two "sex cells" that contain half the DNA each of two organisms
- This is sexual
#### Repair
- Cells naturally die and need to be replaced
- e.g., red blood cells, hair cells, skin, injuries
### Cell cycle
- Interphase
- G1
- S
- G2
- Mitosis
- Occurs only in eukaryotic cells
- Prophase
- Prometaphase
- Metaphase
- Anaphase
- Telophase
- Cytokinesis
- G0
- Cell no longer divides
- Outisde of cell cycle