COMBINED SCIENCE HIGHER BIOLOGY GCSE 9-1 AQA EXAM QUESTIONS COMPLETE WITH 100% VERIFIED ANSWERS

COMBINED SCIENCE HIGHER BIOLOGY GCSE 9-1 AQA EXAM QUESTIONS COMPLETE WITH 100% VERIFIED ANSWERS .What is a cell? - ANSWERS-The basic unit of all living things .What is a eukaryotic cell? - ANSWERS-A cell with a nucleus .What is a prokaryotic cell? - ANSWERS-A cell without a nucleus .Features of a eukaryotic cell? - ANSWERS-- Have a membrane bound nucleus - Large (10 - 100 µm) - Multi cellular - Complex .Features of a prokaryotic cell? - ANSWERS-- Lacks a nucleus - Small (0.1 - 5 µm) - Unicellular - Simple .Example of prokaryotic cell... - ANSWERS-Bacteria .Examples of eukaryotic cells... (2) - ANSWERS-Plant and animal .What is a subcellular structure? - ANSWERS-Different parts of a cell .What is the function of the nucleus? - ANSWERS-Contains genetic info and controls the activities of the cell .What is the function of the mitochondria? - ANSWERS-Where aerobic respiration takes place to transfer energy for the cell .What is the function of the cell membrane? - ANSWERS-Controls what enters and exits the cell .What is the function of the ribosomes? - ANSWERS-The site of protein synthesis .What is the function of the cytoplasm? - ANSWERS-Site of chemical reactions, it contains enzymes to control these reactions .What are the features of an animal cell? (5) - ANSWERS-Nucleus, cytoplasm, cell membrane, mitochondria, ribosomes .What is the function of the cell wall? - ANSWERS-Supports and strengthens the cell .What is the cell wall made of? - ANSWERS-Cellulose .What is the function of the permanent vacuole? - ANSWERS-Contains cell sap, a weak solution of sugar and salts, to keep cell turgid .What does 'turgid' mean? - ANSWERS-Enlarged and swollen with water .What is the function of the chloroplasts? - ANSWERS-Contain chlorophyll, which absorbs light energy for photosynthesis .What are the differences between plant and animal cells? (3) - ANSWERS-Plant cells have: - Cell wall - Permanent Vacuole - Chloroplasts .What contains the DNA in a bacterial cell? - ANSWERS-- Plasmids (small rings of DNA) - Loop of DNA .What are the features of a bacterial cell? - ANSWERS-Cell membrane, cell wall, cytoplasm, loop of DNA, plasmids .What are light microscopes? - ANSWERS-Microscopes that use light and lenses to form an image of a specimen and magnify it .What are electron microscopes? - ANSWERS-Microscopes that use beams of electrons to form an image of the specimen and magnify it .What is magnification? - ANSWERS-How much bigger an image is than a specimen .What is resolution - ANSWERS-The ability to distinguish between two separate points in an image .Benefits of electron microscopes... - ANSWERS-- Better resolution - Better magnification .Benefits of light microscopes... - ANSWERS-- Cheap - Portable - Can examine living specimens - Colour image .What is the formula for magnification? - ANSWERS-Magnification = image size ÷ real size .How do you prepare a slide (magnification) ? - ANSWERS-1. Add a drop of water to the middle of a clean slide 2. Cut open specimen and separate into thin layers, using tweezers to do so 3. Using tweezers, place specimen into the water on the slide 4. Add a drop of iodine solution to highlight objects in a cell 5. Place cover slip on top, ensuring that no air bubbles are trapped .How do you use a light microscope to look at your slide? - ANSWERS-1. Clip the slide onto the stage 2. Select lowest powered objective lens 3. Use the coarse adjustment knob to move stage up and down 4. Look through eyepiece. Use coarse adjustment knob to move stage downwards until image is roughly in focus 5. Adjust the focus with the fine adjustment knob until you get a clear