Step-up transformers are used to increase the potential difference from the power station to the transmission cables then step-down transformers are used to decrease, to a much lower value, the potential difference for domestic use.
Amylase is a carbohydrase which breaks down starch. The specific latent heat of a substance is the amount of energy required to change the state of one kilogram of the substance with no change in temperature. In evaluating methods of treatment you should bear in mind the benefits and risks associated with the treatment.
The structures of tissues in the leaf are related to their functions. In multicellular organisms the smaller surface area to volume ratio means surfaces and organ systems are specialised for exchanging materials. Dimensions to be measured using appropriate apparatus such as a ruler, micrometer or Vernier callipers.
Lipases break down lipids fats to glycerol and fatty acids. You should be able to explain how the structure of these vessels relates to their functions. Be able to recognise, draw and interpret diagrams that model osmosis. Proteases break down proteins to amino acids.
A single-celled organism has a relatively large surface area to volume ratio. Viruses living in cells can be the trigger for cancers. The effect of smoking on lung disease and lung cancer. A reduced voltage is safer for domestic electricity supplies.
Most types of animal cell differentiate at an early stage and then lose the ability to differentiate Whereas many types of plant cells retain the ability to differentiate throughout life. Volume should be determined from the dimensions of regularly shaped objects, and by a displacement technique for irregularly shaped objects.
The effectiveness of an exchange surface is increased by: You should have investigated, using appropriate apparatus, the densities of regular and irregular solid objects and liquids, making and recording appropriate measurements.
Knowledge of the names of the heart valves is not required. A set of 38 questions based on the equations in the AQA GCSE Combined specification that students need to recall and apply. The first 19 questions introduce each equation needed and the next 19 repeat the questions with new values for practice.
AQA GCSE Combined Science past exam papers and marking schemes, the past papers are free to download for you to use as practice for your exams. Mar 21, · the aqa gcse combined science trilogy 1st biology exam paper - learning objectives. aqa grade gcse combined science trilogy Past papers | nick dale Here is a selection of past papers organised by age group.
Science GCSE Qualifications from AQA papers, and resource development. More about our KS4 suite of specifications, including our Entry Level Certificate and STEM Technical Award Level 1 and 2. Upcoming events. More meeting dates. Professional development.
GCSE Science: Getting started. Wednesday 26 September London.
GCSE Physics. Collins GCSE Revision - AQA GCSE Combined Science Higher Practice Test Papers. Format: Paperback. Publication Date: Collins GCSE Revision - AQA GCSE Combined Science Higher Practice Test Papers:Downloadable document edition. Format: Digital download. The '' AQA specification for GCSE Biology, examined from summerAqa practice science papers gcse