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GCSE: Life Processes & Cells

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  1. Does changing the concentration of enzymes affect the rate of an enzyme- controlled reaction?

    A higher body temperature could speed up the chemical reactions in your body. Bu higher temperatures damages human cells. Also to keep your body warm, you have to release energy from respiration. For a higher body temperature, you would need a lot more fuel to fuel respiration. Preliminary Experiment: Before I went on to do my main experiment I carried out a preliminary experiment as a trail run to to see what modifications and improvements I can make for my real experiment. I can assess what went well and what could be improved. Firstly I started by filling up my bowl up with water.

    • Word count: 1562
  2. Assess the effect of different concentrations of salt (NaCl) solution on osmosis in the cells of the potato tuber.

    solution (10%, 20%) %change in mass of cylinders of potato tuber cell 1. Volume of salt solution 2. Temperature of salt solution 3. Type of potato 4. Diameter and length 5. Time potato is submerged in the salt solution 6. Apparatus to measure volume and mass Method for controlling variables 1. Use a 100 ml measuring cylinder to measure 100 ml of each solution of salt 2. Use a thermometer to monitor the room temperature to check that does not vary. 3. Use the same potato tuber to cut all cylinders of potatoes tuber cells 4. Use a core borer and ruler to cut cylinders of the same diameter with a length of 50.0mm 5.

    • Word count: 856
  3. Charateristics Of Life

    Multi-cellular organisms (Asexually): In some complex organisms, part of the body may grow and develop into a separate individual. For example, a small piece of steam planted in the soil may form roots and grow into a complete plant. Asexual reproduction in animals: Some species of invertebrate animals are able to reproduce asexually and one example is Hydra which is a small animal of which is 5-10 mm long and lives in ponds attached to pondweed. Multi-cellular organisms (Sexually): Sexual reproduction involves the production of sex cells. These sex cells are called gametes and they are made in reproductive organs.

    • Word count: 768

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