Unit 2 Biology
- Created by: AlexxxF
- Created on: 11-03-15 19:03
View mindmap
- Cells, tissues and Organs.
- Animal and plant cells
- Nucleus: Controls the cells activities
- Cytoplasm: Where many chemical reactions take place.
- A Cell Membrane: Controls the movement of materials in and out of the cell
- Mitochondria: Where protein synthesis takes place
- Plants and Algae cells also have:
- A rigid cell wall made of cellulose for support
- Chloroplasts that contain chlorophyll.
- A permanent vacuole containing cell sap.
- Bacteria and Yeast
- Bacteria cells have a CELL MEMBRANE and a CELL WALL, which surrounds Cytoplasm
- Doesn't have a nucleus, so genetic information is in the cytoplasm
- When Bacteria multiply they form a colony. Colonies can be seen by the naked eye.
- Bacteria cells have a CELL MEMBRANE and a CELL WALL, which surrounds Cytoplasm
- When Bacteria multiply they form a colony. Colonies can be seen by the naked eye.
- Yeast is a single cell organism
- Yeast cells have a NUCLEUS, Cytoplasm, and a membrane surrounded by a CELL WALL
- Specialised Cells
- The structure of a cell is linked to its function.
- If a cell has lots of Mitochondria is needs lots of energy
- The cells needs lots of protein if it needs Ribosomes.
- The structure of a cell is linked to its function.
- Diffusion
- Diffusion is the spreading out of gas particles or any substance in solution
- The net movement into or out of cells depends on the concentration of particles on either side of the cell membrane
- Concentration gradient
- The larger the difference in concentration the faster the rate of diffusion.
- Tissues and Organs.
- A tissue is a group of cells with similar structure and function
- Animal tissues include:
- Muscle tissue- Contract to bring movement
- Glandular tissue- produces substances such as enzymes and hormones
- Epithelial tissue- Covers some parts of the body.
- Plant tissues include:
- Mesophyll- Can photosynthesise
- Untitled
- Organs are made up of tissues
- Digestive System
- The food we ear needs to be changed from insoluble molecules to soluble molecules, so they can be absorbed into the blood.
- The Digestive System includes:
- Glands (pancreas and salivary glands) which absorb digestive juices
- Stomach and small intestine where digestion occurs
- Liver which produces bile
- Small intestine where soluble food is obsorbed
- Large intestine where water is taken from undigested food
- Animal and plant cells
Comments
No comments have yet been made