GCSE Biology

What’s inside

• A microscope image of a cell is 40 mm long, while the actual cell is 0.2 mm long. What is the magnification?
• The cell membrane controls which substances can enter and leave a cell.
• What usually happens to an enzyme when it is heated well above its optimum temperature?
• Alleles are different versions of the same gene.
• Which hormone lowers blood glucose concentration when it becomes too high?
• Energy is transferred and usually lost to the surroundings at each stage of a food chain.
• Which substance is produced by photosynthesis and released from plant leaves?
• Mitosis produces two genetically identical daughter cells, usually with the same chromosome number as the parent cell.