Topic 1 - Cell biology

• The nucleus is the control centre of the cell, containing DNA which controls all activities within the cell.
• Cell Membrane - Controls what goes in and out of the cell
• Cytoplasm - A gel-like substance where most chemical reactions take place in the cell
• Mitochondria - The powerhouse of the cell as it produces energy through respiration
• Ribosomes - Where proteins are made
• Animal and Plant cell

  A)

  
• Only plant cell contains :

  • Chloroplast -where photosynthesis takes place providing food for the plant. Vacuole - Contains cell sap Cell wall - Provides strength to the cell, made from cellulose.
• In bacteria cells:

  • Cytoplasm, Cell membrane, Cell wall, Circular stand of DNA -As they have two nucleus, this floats in the cytoplasm. contains DNA Plasmid -Small rings of DNA