You should be able to: Platelets are fragments of cells which initiate the clotting process at wound sites. It is spread in the environment by water or wind.
You should be able to describe the nature of enzyme molecules and relate their activity to temperature and pH changes. The movement of food through phloem tissue is called translocation. In double blind trials, some patients are given a placebo, which does not contain the drug.
Appreciate that large molecules cannot pass through the membrane. Clinical trials use healthy volunteers and patients. However, some qualifications from the English boards are available as designated qualifications in some circumstances, due to not being available from WJEC.
You should be able to use other models to explain enzyme action. Be able to explain how electron microscopy has increased understanding of subcellular structures. Painkillers and other medicines are used to treat the symptoms of disease but do not kill pathogens.
Since the s a range of antibiotics have been developed which have proved successful against a number of lethal diseases caused by bacteria. You should be able to translate information between graphical and numerical forms; and extract and interpret information from charts, graphs and tables in terms of risk factors.
Crop plants with special features such as disease resistance can be cloned to produce large numbers of identical plants for farmers. Many diseases are caused by the interaction of a number of factors. The heart is an organ that pumps blood around the body in a double circulatory system.
Numerous subjects have been added and changed, and various new subjects are offered in the modern languages, ancient languages, vocational fields, and expressive arts, as well as Citizenship courses.
The race is now on to develop a new set of antibiotics. Organs are aggregations of tissues performing specific functions. The spread of diseases can be reduced or prevented by eg simple hygiene measures, destroying vectors, isolation of infected individuals and vaccination.
Whilst there may be compromises to be made, they carry out optimisation processes to ensure that enough product is produced within a sufficient time, and in an energy efficient way.
You should be able to recognise and describe situations in given contexts where mitosis is occurring. Pathogens are microorganisms that cause infectious disease.
Once inside the body our immune system is triggered which is usually strong enough to destroy the pathogen and prevent disease. The digestive system is an example of an organ system in which several organs work together to digest and absorb food.
Scientists have identified lifestyle risk factors for various types of cancer including smoking, obesity, common viruses and UV exposure. You should understand that the results of testing and trials are published only after scrutiny by peer review.
HT only You should be able to express the answer in standard form. This helps to prevent false claims. Pathogens are microorganisms such as viruses and bacteria that cause infectious diseases in animals and plants. Know that plants can be damaged by a range of ion deficiency conditions eg stunted growth caused by nitrate deficiency chlorosis caused by magnesium deficiency.
Edexcel Past Papers – Where to Find. The Edexcel continues to improve its qualifications through further research and intensive collaboration with the educators and the government.
The goal of this independent charity to meet the needs of the learners and the school is evident in. Find past papers and mark schemes for your exams, and specimen papers for new courses. Topic Cell structure (AQA GCSE Biology Paper 1).
Eukaryotes and prokaryotes (Revision notes for AQA GCSE Biology, Paper 1, Topic 1 "Cell Biology"). Know that plant and animal cells (eukaryotic cells) have a cell membrane, cytoplasm and genetic material enclosed in a nucleus.
Search for past GCSE and A Level exam papers and mark schemes at Get Revising. Economics A (8EC0): Edexcel AS-Level Past Papers June Paper 1: AS - Introduction to Markets and Market Failure (8EC0/01) - Download Past Paper - Download Mark Scheme Paper 2: AS - The UK Economy - performance and policies (8EC0/02) - Download Past Paper - Download Mark Scheme.
_Year _Specimen Paper_1 ( Kb) _Year _Specimen Mark Scheme_1 ( Kb) _y12_sp_2 ( Kb) _y12_sm_2 ( Kb).Edexcel gcse economics past papers