Biology 0.0 / 5 ? BiologyCells, tissues and organsGCSEAQA Created by: rebeccamariaCreated on: 17-09-15 14:34 What are pathogens? Microorganisms that enter the body and cause diseases 1 of 28 Explain how viruses replicate within your body They replicate themseleves by invading your cells and producing many copies of themselves 2 of 28 What are antigens? Unique molecules on the surface of cells/pathogens etc 3 of 28 Why are cultures of microorganisms grown at temperatures no higher than 25 degrees in school labs? To prevent harmful pathogens from growing 4 of 28 What is epidemic? Big break out of disease 5 of 28 What is pandemic? When a disease spreads all over the world 6 of 28 What is a vaccination? A vaccination involves injecting small amounts of inactive microoganisms 7 of 28 How can you prevent contamination? Sterilise equipment before use e.g. petri dishes 8 of 28 What might the inappropriate use of antibiotics lead to? You body becoming resistant to it 9 of 28 Why would a course of antibiotics not be suitable for treatment such as the flu? Flu is a virus and antibiotics are not effective against viruses 10 of 28 List four things that need to be kept constant with the body? Temperature, blood sugar levels, water, ions 11 of 28 What is a mutation? A change in an organisms DNA 12 of 28 Give three ways in which plant cells are different from animal cells. Plant cells have extra features: cell wall, chloroplasts and a permanent vacuole 13 of 28 Define diffusion. The spreading out of particles, from an area of high concentration to an, area of low concentration 14 of 28 What is the function of a red blood cell? To carry oxygen; around the body 15 of 28 Name the green substance present in chloroplast Chlorophyll 16 of 28 What is the nucleus? Contains the geneteic material 17 of 28 Name one cell that does not have a nucleus. Bacteria cell 18 of 28 Where is genetic material found in a bacterial cell? Floating in the cytoplasm because, it has no nucleus 19 of 28 Name 5 things an animal has Cell membrane, mitochondria, ribosomes, nuclues, cytoplasm 20 of 28 What is the function of the nucleus? Controls activities of the cell and carries genetic information. 21 of 28 What is the function of ribosomes? To make the proteins 22 of 28 What is the function of cytoplasm? Where most chemical processes take place here 23 of 28 What is the function of the cell membrane? Controls what goes in and out of the cell 24 of 28 What is the function of the mitochrondria? Where most of the energy is released by respiration 25 of 28 Which part is missing from human red blood cells? And why? A nucleus; to carry more oxygen 26 of 28 How are yeast cells different from bacterial cells? They have a nucleus 27 of 28 How are bacterial cells different from animal cells? They have a cell wall and no nucleus 28 of 28
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