From 8fce0b1074218b023e187fdb5497d457ade266c0 Mon Sep 17 00:00:00 2001
From: Daniel Chen <eggyrules@gmail.com>
Date: Thu, 7 Nov 2019 15:19:53 +0000
Subject: [PATCH] Update Unit 2: Biology.md
---
Grade 10/Science/SNC2DZ/Unit 2: Biology.md | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/Grade 10/Science/SNC2DZ/Unit 2: Biology.md b/Grade 10/Science/SNC2DZ/Unit 2: Biology.md
index 10c32be..d611868 100644
--- a/Grade 10/Science/SNC2DZ/Unit 2: Biology.md
+++ b/Grade 10/Science/SNC2DZ/Unit 2: Biology.md
@@ -163,18 +163,18 @@ A person contains roughly 100 trillion cells
### Purpose
-#### 1. Reproduction
+### 1. Reproduction
- Single-cellular organisms reproduce via division **asexually**
- Multicellular organisms reproduce via combining two germ cells ("sex cells") that contain half the DNA each of two organisms
- This is **sexual**
-#### 2. Growth
+### 2. Growth
- Cells have maximum size before transportation of substances within cell becomes **inefficient**, due to **larger cells** decreasing efficiency of `diffusion`
- Cells transport chemicals (e.g., nutrients) via `diffusion`, this **limits cell size**
- The only way to maintain proper function and get bigger is to **add more cells**
-#### 3. Repair
+### 3. Repair
- **Organisms need to repair cells to stay alive and maintain proper health**
- Millions of cells are replaced everyday
- Cells naturally die and need to be replaced
@@ -201,7 +201,7 @@ A person contains roughly 100 trillion cells
- Cell no longer divides ("cell cycle arrest")
- Outside of cell cycle
-#### Mitosis
+### Mitosis
- `Chromatid`: Supercoiled DNA, only visible during mitosis, cannot be read without unwinding, similar to compressed zip file
- `Chromosome`: Two identical "sister chromatids" held together in centre by `centromere`, or one sister chromatid after anaphase
- `Centromere`: Proteins sticking sister chromatids
@@ -229,7 +229,7 @@ A person contains roughly 100 trillion cells
- **Cytokinesis** usually begins in telophase
- Cell starts to **cleave** (cell centre starts to pinch itself)
-#### Cytokinesis
+### Cytokinesis
- Cell division
- Cell splits completely to two daughter cells
- In **animal cells**: Cell membrane pulled inward by cytoskeleton