Biology 2

Structure in Common:

• a Nucleus to control the cell activities
•  
• Cytoplasm where many chemical reactions take place
• a Cell Membrane that controls the movement of materials
• Mitochondria where energy is released during aerobic respiration
• Ribosomes where protiens are made (synthesised)

What do Plant cells have that Animal cells don't?

• a rigid Cell wall for support
• Chloroplasts that contain chlorophyll for photosynthesis
• a Permanent Vacuole containing cell sap

• As organisms develop, some of their cells become specialised to carry out particular jobs - Differentiation
• Differentiation happens much earlier in the development in animals than in plants
• At first the egg is just a growing ball of cells, but when to organism gets bigger some of the celss change and become specialised.
• For Plant cells cells may become xylem or root hair cells
• Animal cells may develop into nerve or sperm cells

1. Two examples of specialised animal cells, which have not been mentioned

2. How is the structure of a nerve cell related to it's structure?

3. What do we call the process that results in some cells becoming specialised?

1. Egg cells, muscle cells, white blood cells

2.It is long and has many endings to communicate with other nerves or effectors

3. Differentiation