All of AQA GCSE Biology (9-1) - Paper 1

What are the two types of microscopes? - Light Microscope Electron Microscope What is the magnifying power of a light microscope? - x 2,000 What is the magnifying power of an electron microscope? - x 2,000,000 What is the resolving power? - The ability to distinguish between two separate points What is the resolving power of light microscopes? - 200 nm What is the resolving power of electron microscopes? - 0.2 nm What are the advantages of light microscopes? - 1. living samples 2. can view samples in colour What are the disadvantages of electron microscopes? - 1. dead samples 2. samples in black and white What can they do with electron microscopes to make them coloured? - Dye them or colour them in How do you work out magnification? - Image size / Object size How do you work out image size? - Magnification x Object size How do you work out object size? - Image size / Magnification How do you convert cm to mm? - x 10 How do you convert um (micrometres) to mm? - / 1000 How do you convert mm to um (micrometres)? - x 1000 What does an animal cell contain? - Cytoplasm, Nucleus, Ribosomes, Mitochondrion, Cell Membrane Where is the nucleus located in an animal cell? - The centre What does the nucleus do? - It controls the activities of the cell What is the role of the cytoplasm? - Where chemical reactions take place Does an animal cell have a cell wall? - No, it does not What is the role of the cell membrane? - Controls the ENTRY and EXIT of SUBSTANCES inside the cell What is the role of mitochondria/on? - Creates energy by aerobic respiration What does aerobic respiration mean? - It requires oxygen What is the role of ribosomes? - Where protein synthesis takes place What kind of shape is a plant cell? - Rectangular What kind of shape is an animal cell? - Circular What does a plant cell contain? - Chloroplast Starch grain Cell Membrane Cell Wall Nucleus Mitochondrion Cytoplasm What is the role of the cell wall? - Supports and protects the cell What is the role of the vacuole? - contains cell sap Why is a plant cell rectangular? - Due to the cell wall - strong Where is the nucleus placed in a plant cell? - In one corner/side