highschool/Grade 10/Science/SNC2DZ/Unit 2: Biology.md

Unit 2 Biology

• Tissues
• Organs,
• Systems of living things

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

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

Types Of Cells

Prokaryotic cell: Meaning before/lacking

Eukaryotic cell: Has organelles, meaning true, complete.

Part Of Cell	Prokaryotic	Eukaryotic
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