AQA GCSE Combined Science Trilogy : Biology Paper 1 Questions and Answers 100% Pass

AQA GCSE Combined Science Trilogy : Biology Paper 1 Questions and Answers 100% Pass Name the two types of cells - Answer️️ -Prokaryotic and Eukaryotic What is a prokaryotic cell? - Answer️️ -A cell without a nucleus Give an example of a prokaryote (Prokaryotic cell) - Answer️️ -Bacteria What is a eukaryotic cell? - Answer️️ -cell with a nucleus Give two examples of eukaryotic cells - Answer️️ -Plant & Animal cells What three sub-cellular structures do plant cells have which animal cells do not? - Answer️️ -Permanent vacuole, cell wall and chloroplasts What is the function of the nucleus? - Answer️️ -Contains genetic materials that controls the activities of the cell What is the function of the cytoplasm? - Answer️️ -A gel-like substance where most of the chemical reactions happen. It contains enzymes that control these reactions What is the function of the cell membrane? - Answer️️ -Holds the cell together and controls the passage of substances What is the function of the mitochondria? - Answer️️ -These are where most of the reactions for aerobic respiration take place. Respiration transfers energy that the cell needs to work What is the function of the ribosome? - Answer️️ -These are were proteins are made in the cell through protein synthesis What is the function of the cell wall? - Answer️️ -To strengthen and support the cell What is the function of the vacuole? - Answer️️ -Contains cell sap (a weak solution of sugar and salts), it keeps the cell turgid What is the function of the chloroplast? - Answer️️ -This is where photosynthesis takes place, which makes food for the plant. They contain a green substance called chlorophyll which absorbs the light required for photosynthesis What do bacterial cells have instead of a nucleus? - Answer️️ -A single circular strand of DNA that floats freely in the cytoplasm, and some may also contain one or more small rings of DNA called plasmids. How many mm are in um? - Answer️️ -1000 What do light microscopes use to work? - Answer️️ -Light and lenses to form an image of a specimen. They let us see individual cells and large sub cellular structures such as nuclei What is the formula triangle for magnification? - Answer️️ - What do electron microscopes use to work? - Answer️️ -Electrons instead of light to form an image. They have a much higher magnification than light microscopes How are electron microscopes better than light microscopes? - Answer️️ -They allow us to see much smaller things in greater detail since they have a higher magnification and resolutions. For example, using an electron microscope, we can see the internal structure of mitochondria and chloroplast Describe the steps to prepare a slide [Required Practical] - Answer️️ -1) Add a drop of water to the middle of a clean slide 2) Cut up an onion and separate it out into layers. Use tweezers to peel off some epidermal tissue from the bottom of one the layers 3)Using the tweezers, place the epidermal tisse into the water on the slide 4) Add a drop of iodine solution. Iodine solution is a stain which is