eggy/highschool
1
0
Fork 0
mirror of https://gitlab.com/magicalsoup/Highschool.git synced 2025-01-23 16:11:46 -05:00
Code Issues Releases Wiki Activity

Update Unit 2: Biology.md

Browse Source
This commit is contained in:
Daniel Chen 2019-10-25 14:08:27 +00:00 committed by James Su
parent 07674238b1
commit f488574645
1 changed files with 40 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
Grade 10/Science/SNC2DZ/Unit 2: Biology.md
View File

@ -1,27 +1,49 @@
# Unit 2 Biology
- Tissues
- Organs,
- Systems of living things
# Unit 2: Biology
## Celular Biology
A person contains roughly 100 billion cells
- there are roughly to different types of cell s found in mammals
- cells are roughly 20 $`\um`$ (micrometer, $`10^{-6}`$ m), around 250 cells / cm
## Cellular Biology
A person contains roughly 100 trillion cells
- Cells are roughly 20 `μm` (micrometre, 10<sup>-6</sup> m), around 250 cells / cm
## Cell Theory
1. All living things are composed of cells
2. cells are the basic units of living organisms
3. all cells came from pre-existing cells
2. Cells are the basic units of living organisms
3. All cells came from pre-existing cells
## Types Of Cells
`Prokaryotic cell`: Meaning before/lacking
## Eukaryotic versus Prokaryotic Cells
`Prokaryotic cell`: Meaning before/lacking nucleus
`Eukaryotic cell`: Has organelles, meaning true, complete.
`Eukaryotic cell`: Means complete nucleus
|Part Of Cell|Prokaryotic|Eukaryotic|
|Factors|Prokaryotic|Eukaryotic|
|:-----------|:----------|:---------|
|DNA|In nucleoid region|Usually in membrane, bound nucleus|
|DNA|In nucleoid region|Usually in membrane-bound nucleus|
|Size|Usually smaller|Usually larger|
|Organelles|No membrane, bound organelles|Membrane, bound organelle, the bigger, the more complex|
|Organization|Usually singler celled|Often multicellular|
|Metabolism|May not need oxygen|Usually needs oxygen to exist|
|Organelles|Not membrane-bound, smaller|Membrane-bound, more complex|
|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 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
- DNA is a double helix that make genes
- Genes are a complete set of instructions to make a complete product (typically proteins)
- Chromatin is DNA wrapped tightly in protein
- Chromosomes are even more tightly wrapped chromatin used in cell division only
- Surrounded by a double membrane
- Substances enter and exit the nucleus via nuclear pores
- Messenger RNA (mRNA) is encoded from DNA and sent to ribosomes to produce proteins
### Nucleolus
- Dense region of DNA located in the nucleus
- This area of DNA is specially for ribosomal DNA (rDNA)
- Produce "large" and "small" units of complete ribosomes, which either remain free or mix with endoplasmic reticulum, forming rough endoplasmic reticulum (RER)
- Is *not* surrounded by a membrane, literally is just same as rest of nucleus but denser