Risk factors are linked to an increased rate of a disease. Some of the substances transported in and out of cells by diffusion are oxygen and carbon dioxide in gas exchange, and of the waste product urea from cells into the blood plasma for excretion in the kidney. This reduces the flow of blood through the coronary arteries, resulting in a lack of oxygen for the heart muscle.
Know and understand that an electron microscope has much higher magnification and resolving power than a light microscope. In each case they provide dissolved materials that need to be moved quickly around the body in the blood by the circulatory system e.
The effects of diet, smoking and exercise on cardiovascular disease. Sugar molecules are used for cell respiration. Know that the roots, stem and leaves form a plant organ system for transport of substances around the plant.
Proteases break down proteins to amino acids. You need to understand the three overall stages of the cell cycle but do not need to know the different phases of the mitosis Aqa gcse economics past papers.
Chemical reactions may also be reversible and therefore the effect of different variables needs to be established in order to identify how to maximise the yield of desired product. Temperature must be controlled by use of a water bath or electric heater.
This helps to prevent false claims. Diseases, both communicable diseases and non-communicable, are major causes of ill health. The hybridoma cell can both divide and make the antibody.
In the UK, poultry are vaccinated against Salmonella to control the spread. In body cells the chromosomes are normally found in pairs. Other factors including diet, stress and life situations may have a profound effect on both physical and mental health.
Bacteria and viruses may reproduce rapidly inside the body. The heart drug digitalis originates from foxgloves.
The effect of smoking on lung disease and lung cancer. Know that the role of stomata and guard cells are to control gas exchange and water loss. Be able to use prefixes centimillimicro and nano expressing answers in standard form and carry out calculations involving magnification, real size and image size using the formula: Be able to explain how the spread of diseases can be reduced or prevented.
See also Enzymes and Biotechnology gcse chemistry notes You should be able to recall the sites of production and the action of the enzymes amylase, proteases and lipases. Measles is a serious illness that can be fatal if complications arise.
Pathogens may be viruses, bacteria, protists or fungi. You need to be able to use simple compound measures such as rate and carry out rate calculations for blood rate.
You should be able to: Active transport allows mineral ions to be absorbed into plant root hairs from very dilute solutions in the soil. You should be able to explain and describe how diffusion, osmosis and active transport are used to transport materials into and out of cells and the differences between these three processes.
Be able to recognise, draw and interpret diagrams that model diffusion. With electron microscopes, using a beam of electrons instead of a beam of light, you gain a much higher resolution seeing much smaller objects e.
Be able to interpret the results of the petri dish experiments e. To treat some diseases: The race is now on to develop a new set of antibiotics. You should be able to develop an understanding of size and scale in relation to cells, tissues, organs and systems.
Appreciate the everyday application of scientific knowledge to detect and identify plant disease AND the understanding of ion deficiencies allows horticulturists to provide optimum conditions for plants 3.
Mechanical adaptations Thorns and hairs deter animals from eating or touching them. Measles is a serious illness that can be fatal if complications arise. You should understand the use of isotonic drinks and high energy drinks in sport. Your knowledge should be limited to epidermis, palisade and spongy mesophyll, xylem and phloem and guard cells surrounding stomata.Syllabus-specification CONTENT INDEX of revision summary notes.
Revision summaries for AQA GCSE Combined Science Trilogy Chemistry Paper 1 (separate page). What's assessed in this paper? SUMMARY Topic 8 Atomic structure and the periodic table (Combined Science Trilogy Chemistry paper 1).
SUMMARY Topic 9 Bonding, structure, and the properties of matter (Combined Science Trilogy. MARK SCHEME – GCSE ECONOMICS – – JUNE 4 of 15 Total for this question: 30marks.
Question 1 – Item A. 1 (a) Camilla faces opportunity costs if she buys a car. (i) Tick one of the boxes next to the statement which best describes an AQA GCSE Economics. Search for past GCSE and A Level exam papers and mark schemes at Get Revising.
Specimen and past papers, mark schemes, example answers. All assessment resources. Key dates. 24 May Exam for GCSE Economics (new) (/1) Series: June Start time: pm Duration: 1h 45m; 3 June Exam for GCSE Economics (new) (/2) AQA is not responsible for the content of external sites.
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