Biology- B4 Part B

1. In a ...: Light is needed: Supply of artificial light after sundown, Paraffin heater which produces carbon dioxide as a by product, Enclose plants so pests and insects are kept away. Costs money, but plants grow faster and better so bigger income (10)
4. ... is lots of chemical reactions happening in a cell controlled by enzymes. Reactions are all linked together to form bigger reactions. This is the sum of all reactions that happen in a cell or body (10)
5. ... respiration is respiration with oxygen- the most efficient way to transfer glucose. It happens all the time in plants and animals and most reactions happen inside mitochondria (7)
8. ... is transferring energy from the break down of glucose which goes in every cell, which happens in all living things. It is exothermic- transfers energy to the environment (11)

2. How organisms use ...: 1) Build up larger molecules from smaller ones 2) Allows muscles to contract in animals 3) Mammals and birds use it to keep body temperature constant (6)
3. Aerobic Respiration: Glucose + ... -> Carbon Dioxide + ... (6, 5)
6. Large molecules are ... smaller molecules: -Small glucose molecules joined together to form starch, glycogen (storage molecule in animal cells) and cellulose -Lipid molecules each made from a molecule of glycerol and 3 fatty acids (4, 4)
7. Large molecules are ... smaller molecules: -broken down in respiration -Excess protein broken down in reaction to produce urea which is excreted in urine (6, 4, 4)

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