Biology GCSE AQA - CELLS 5.0 / 5 based on 1 rating ? BiologyCells, tissues and organsGCSEAQA Created by: RevisingBirdCreated on: 27-01-18 16:48 What are eukaryotic cells? Animal and plant cells 1 of 35 What are prokaryotic cells? Bacteria cells 2 of 35 How do you calculate sizes and orders of magnitude? size of the bigger object/size of the small object 3 of 35 What can embryonic stem cells do? Become any type of specialised cell 4 of 35 What is a plant stem cell? An unspecialised cell that can differentiate into any type of plant 5 of 35 Where are plant stem cells found? Root tips + shoot tips + stem 6 of 35 What is differentiation? When an unspecialised cell turns into a specialised cell 7 of 35 What does DNA do? Codes for different proteins 8 of 35 What is needed if a protein is produced? The gene needs to be switched on 9 of 35 What happens if specialised cells work together? They make tissues 10 of 35 Where is epithelial tissue? The inner layer of cells 11 of 35 What does muscle tissue do? Contracts to churn food and and digestive juices 12 of 35 What does glandular tissue do? Releases digestive juices e.g. enzymes 13 of 35 Whats the correct statement about a light microscope? Magnifies cells and sub-cellular structures 14 of 35 What's the correct statement about a TEM? It has a magnification up to 2,000,000 15 of 35 What's the correct statement about a SEM? It has a lower magnification that TEM 16 of 35 What's the equation for total magnification? eyepiece magnification x objective magnification 17 of 35 Pick the equation relating image size, magnification and specimen size magnification = image size/ specimen size 18 of 35 What is diffusion? Net movement of particles from a high to a low concentration 19 of 35 What quickens the rate of diffusion? If the concentration gradient is bigger 20 of 35 When do the particles in diffusion stop moving randomly? When equilibrium is reached 21 of 35 What's the carbon dioxide conc. like inside a leaf compared to the air outside It's lower because it's being used up in cells 22 of 35 What's the oxygen conc. like inside a leaf compared to the air outside It's higher because it's being produced in the cells 23 of 35 What is osmosis? Diffusion of water from a high conc. to a low conc. across a partially a permeable membrane 24 of 35 How is osmosis different to diffusion? There is no net movement because it has reached equilibrium 25 of 35 What does isotonic mean? Conc. of solutions outside and inside cell are equal 26 of 35 What does hypotonic mean? Conc. outside cell is lower than inside the cell 27 of 35 What does hypertonic mean? Conc. outside the cell is higher that the conc. inside the cell 28 of 35 Name when osmosis is diffusing out of the cell Plasmolysed - Hypertonic 29 of 35 Name when osmosis will occur into the cell Turgid - Hypotonic 30 of 35 Name when there is no net movement in osmosis Flaccid 31 of 35 How is a cell made turgid? When the water pressure builds up and pushes against the cell wall 32 of 35 What's the fancy word for when the water outside and inside a plant cell is equal Flaccid 33 of 35 What is active transport? Movement of substances from a low to a high concentration 34 of 35 What is different about active transport and why? It goes against the concentration gradient because it needs energy from mitochondria 35 of 35
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