AQA Biology GCSE Unit 2 Quiz 2.0 / 5 based on 2 ratings ? BiologyGCSEAQA Created by: KateCreated on: 12-05-13 11:42 What do yeast cells have that bacterial cells do not? Nucleus 1 of 17 What molecules can diffuse through cell membranes? Oxygen, Glucose, Amino Acids and Water 2 of 17 Why do Guard Cells close at night? To save water without losing out on photosynthesis 3 of 17 What is a tissue? A tissue is a group of similar cells that work together to carry out a particular function 4 of 17 How does water reach the cells? Via the Xylem 5 of 17 What substance can be used to control the amount of CO2? Sodium Hydrogencarbonate 6 of 17 How can you increase the level of carbon dioxide in greenhouses? Use a paraffin heater 7 of 17 What is glucose combined with to make amino acids? Nitrate ions 8 of 17 How do you work out the population size? Multiply the mean by the total area of the habitat 9 of 17 For results to be valid they must be what? Reliable 10 of 17 What pH does pepsin work best at? pH2 11 of 17 Emulsifying fats makes what process happen faster? Digestion 12 of 17 Where is Bile stored? Gall Bladder 13 of 17 What is glycogen used for? To provide more energy 14 of 17 What is a gene? Section of DNA which contains the instructions to make a specific protein 15 of 17 In mitosis how many cells are formed? Two 16 of 17 Why is there a lack of evidence for how life began? Early organisms were soft bodies and soft tissue tends to decay away completely 17 of 17
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