Biology

Human, animal and plant cells contain:

• Nucleus-controls the activities in the cell
• Cytoplasm-where most chemical reactions take place
• Cell Membrane-controls what comes in and goes out
• Mitochondria-most energy is released here in respiration.
• Ribosomes-where protein synthesis occurs

Plant cells also contain:

• A cell wall-(made out of cellulose) to strengthen the cell
• Chloroplasts-abosrb light to make food
• A permanent vacuole-filled with cell sap

In a bacterial cell, the genes are NOT in a nucleus. Within a bacterial cell is:

• Cytoplasm
• Cell membrane
• Cell wall

In a yeast cell is:

• Nucleus
• Cytoplasm
• Cell membrane
• Cell Wall

Diffusion is the spreading out of the particles of a gas or substance in a solution. It results in a net movement from a region of high concentration to a region of low concentration. The greater the difference in concentration, the faster the rate of diffusion.