physical contact, ingestion, droplet … OCR A Level Biology- Communicable Diseases. An example of a viral, bacterial and fungal disease are given. Summary - Revision powerpoint on biodiversity ocr a level biology 2015 Show more . The outer layer of skin is called the epidermis and consists of layers of keratinocytes. OCR (A) A-Level Biology Revision For each of the papers below, there are revision notes, summary sheets, questions from past exam papers separated by topic and other worksheets. Leaves, tubers and fruit. However, some mutations result in the creation of a protein that provides an advantage to an organism. Administer exams and assessments. Morphine originated in the use of sap from unripe poppy seed heads in Neolithic times, in the 12th century the opium from poppies was used as an anaesthetic and by the 19th century morphine and opium were used to reduce nervous action in the central nervous system, Willow bark is used to relieve pain and fever. Biotechnology and Genetic Engineering, Section 1: The Nature and Variety of Living Organisms, Section 2: Structures and Functions in Living Organisms, Module 1: Development of Practical Skills in Biology, Module 4: Biodiversity, Evolution and Disease, Module 5: Communication, Homeostasis and Energy, Module 6: Genetics, Evolution and Ecosystems, 3.3 Organisms exchange substances with their environment, 3.4 Genetic information, variation and relationships between organisms, 3.5 Energy transfers in and between organisms, 3.6 Organisms respond to changes in their internal and external environments, 3.7 Genetics, populations, evolution and ecosystems, Topic 4: Biodiversity and Natural Resources, Topic 6: Immunity, Infection and Forensics, Topic 8: Metabolism, Cell Respiration and Photosynthesis, B1.6 Waste materials from plants and animals, Travel from one host to another (transmission), Cellulose cell wall – this acts as a physical barrier but also contains many chemical defences that can be activated when a pathogen is detected, Thickening of the cell wall with lignin – lignin is a phenolic compound and completely waterproof as well as largely indigestible, Waxy cuticles – these prevent water collecting on the cell surfaces which removes the water that the pathogenic cells need to survive, Bark – most back also contains a variety of chemical defences as well as being a physical barrier to disease, Stomatal closure- stomata are possible points of entry for pathogens and so the guard cells can close them when pathogenic organisms are detected, Callose – callose is a large polysaccharide that is deposited in the sieve tubes at the end of the growing season around the sieve plates and blocks the flow in the tube. So if you’re revising Cell Division for OCR (A) A-Level Biology, you can find all of the Cell Division questions that have been ever asked by OCR in one single document - useful, no? Topic Questions; Past Papers; OCR Biology. (b) the causes, means of transmission, symptoms and the principal treatment of tuberculosis (TB) To include droplet infection, details of primary and secondary TB and also opportunistic infections (HIV, AIDS). the HIV virus binds to the CD4 and CCR5 receptors on T helper cells. Cells differentiate and T & B memory cells are produced to remain in the blood should the body ever come under attack from the same pathogen again. The keratinocytes are produces at the base of the epidermis and migrate out to the surface of the skin, slowly drying out and their cytoplasm in replaced by the protein keratin in the process of keratinisation. Match. OCR Biology A: Communicable Diseases. hep B, Toxoids – harmless version of a toxin e.g. PLAY. Expert from NTU answered your questions - watch here! What does a vector do? $ 131.14 $ 20.59. You're blocking ads :(Revisely is 100% funded by ads. User account menu. �3!%N'I��V:z��4�W� !-}�Ε{���� �&�E��L�p��x)�4���rqN��� You are currently using guest access . Pharmaceutical companies also research the way that microorganisms cause disease so that they can model ideal proteins and glycoproteins to act as medicines on these drugs. 2x sold. Inflamation – the tissue may be hot and painful as the presence of harmful microorganisms has been detected by mast cells which release a cell signalling substance called histamine which causes vasodilation to make the capillary walls more permeable to white blood cells and proteins. endobj Some antibodies bind to molecules that are release by pathogenic cells. Indirect transmission- inhaling air droplets from coughs and sneezes 3. An infectious disease is a disease resulting from the presence of pathogens including viruses, bacteria, fungi, protozoa and multicellular parasites. Back to Science for Kids. 107 1. people who exercise regularly are usually healthier than people who take little exercise because regularly exercising people make bigger muscles, up to 40% of their body mass, and muscle tissue needs much more energy to be transferred from food than body fat. 1. Home. Biology AS/A Level OCR Flashcards Decks in this Class (26): 31 Exchange Surfaces And Breathing. x��XmO�H�)�a?��e�}_���Ԫ\��zP?X���$�S��t��f�Nl�8�B��띝g�yvvMt�,�7�`��G�E��o�kv������>�.��t��|��;9��Q��.�lt�� ß`N�X�c�F�~/f����],��F���3�D덉�ar|U0 &X�_>��O,�-�ع�������",g�? So if you’re revising Cell Structure for AQA GCSE Biology, you can find all of the Cell Structure questions that have been ever asked by AQA in one single document - useful, no? In the UK young children are immunised against the following diseases: diphtheria, tetanus, whooping cough, polio, meningitis, measles, mumps and rubella. About Tutoring; Masterclasses - OCR A & AQA; Reviews; OCR A "Walkthroughs" Improve your Answers ; Resources; OCR A Videos; Past Papers; Menu. Pure Maths; CIE A Level Maths. Back to Science for Kids. Home About GCSE A-Level AS Past Papers Contact. PDF 6MB; Graphs, tables and drawings: student checklists Passive immunity – immunity achieved when antibodies are passed to the individual through breast feeding or injection, Antibiotic – a chemical which prevents the growth of microorganisms, can be antibacterial or antifungal, Personalised medicine – development of designer medicines for individuals, Synthetic biology – re-engineering of biology, from the production of new molecules that mimic a natural process to the use of natural molecules to produce new biological systems that do not exist in nature. endobj %���� Summary - Revision powerpoint on variation and inheritance ocr a level biology 2015 22. Notes for the OCR A Level Biology module: Module 4: Biodiversity, Evolution and Disease. Vectors__ __- organisms that carry the disease between hosts such as mosquitoes for malaria 4. Pathogens . Topics include: why are new drugs needed? We provide detailed revision materials for A-Level Biology students and teachers. Specific immune response involves B lymphocytes (B cells) and T lymphocytes (T cells) which are white blood cells with specialised receptors on their cell surface membranes. Infectious pathologies are usually contagious diseases due to their potentiality of transmission from one person or specie to another. Created by. Antigens are molecules that stimulate an immune response, usually proteins/glycoproteins in the pathogen’s plasma membrane, and when detected the production of antibodies is commenced. An infectious disease is a disease resulting from the presence of pathogens including viruses, bacteria, fungi, protozoa and multicellular parasites. Mutations A mutation is a change in the DNA and this could result in a non-functioning protein being created. E.g. Pathogens and Disease AS Biology Questions OCR Edexcel Author: Maths Made Easy Subject: A Level Biology Keywords: biology, questions, worksheets, revision, aqa, edexcel, ocr, a level, Pathogens, disease Created Date: 9/28/2017 3:25:31 PM The detection of the pathogenic antibodies triggers clonal expansion in both T and B cells. Spell. Triple Science,Biology,Communicable and Non-Communicable diseases. Whether you are looking for the 2015 OCR Biology specimen papers or you want to use some of the questions from the OCR legacy papers, you should find what you are looking for. Indirect transmission of plant pathogen occurs as a result of insect attack. bacteria - cause communicable disease. Gravity. The fungus that causes Dutch elm disease is carried by the beetle Scolytus multistriatus. So if you’re revising Cell Division for OCR (A) A-Level Biology, you can find all of the Cell Division questions that have been ever asked by OCR in one single document - useful, no? Module 4 – Biodiversity, Evolution and Disease Revision Notes: Summary - Revision powerpoint on variation and inheritance ocr a level biology 2015 22. This can prevent a pathogen spreading around the plant, Tylose formation – tylose is a balloon like swelling or projection that fills the xylem vessel, when fully formed it can completely block off that part of the xylem vessel. Start studying OCR A Level Biology- Communicable Diseases. Evolution. Author and Series Editor Ann Fullick, Author Jo Locke, and Author Paul Bircher. - there are many diseases for which there are no effective treatments, why are new drugs needed? >> Applying to uni? Hi, on OCR bio A are we supposed to learn the difference between cell-mediated immunity and humoral immunity? About Us | Contact Us | Privacy Policy | Terms and Conditions | Sitemap, GCSE, IGCSE, A-Level, and IB Biology Resources & Revision for all exam boards, Unit 2: Body Systems, Genetics, Microorganisms and Health, Unit 1: Cells, Living Processes and Biodiversity, Biology 1: Adaptation, Evolution and Body Maintenance, Biology 2: Cells and Metabolism, Digestion and Respiration, Biodiversity, 1. The bar chart shows when some different drugs were introduced (start of bar) and when resistance to them was first reported (end of bar). OCR A level Biology A from 2015. Each cell was observed using a different type of microscope. T killer cells attack infected host cells and plasma cells make antibodies (the differentiation for this is triggered by cytokines from the macrophages. Infectious Disease. Notes.pmt.education. A-level Biology questions by topic with markschemes on Evolution, Biodiversity and Classification. Neutralise pathogens that use their antigens to bind to host cells etc. antibody level rises to combat infections, Whole live microorganisms (usually not very harmful g. smallpox which prevents cowpox virus, a much nastier disease), Harmless attenuated version of the pathogenic organism e.g. Biology GCSE 9-1. Revise monitoring and maintaining health for communicable diseases for GCSE Biology with BBC Bitesize. <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 7 0 R] /MediaBox[ 0 0 595.4 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 1>> 1.1 | Development of Practical Skills (Part 1) Question Paper Mark Scheme; 1.1 | Development of Practical Skills (Part 2) Question Paper Mark Scheme; 2. abaker_2001. If you want to know more about measles then this video is the one to watch (don't worry you will not need to know all of this for the syllabus, its just an interesting video!) Birds line their nests with medicinal leaves to protect young from blood sucking mites. Become a centre; Become an assessor; Check key dates and timetables; Check fees information; Check results; Create a scheme of work �y�X��^����-��. - some antibiotic trea Topic 4.1: Communicable diseases, disease prevention and the immune system . … In this quiz, we aim to spread awareness on communicable diseases and see how much you can tell us about them and how they … Also offering past papers and exam questions by topic for AQA, Edexcel and OCR. Humans have an immune system, which can defend them from pathogens. - new diseases are emerging, why are new drugs needed? Module 4 - OCR Exam Board. Flashcards. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Infectious Disease. Come from the bone marrow and develop in the thymus, T helper cells (Th) – release cell signalling molecules (cytokines) that stimulate the immune response of B cells to develop and stimulate phagocytosis by phagocytes, T killer cells (Tk) – attack and kill host-body cells that display the foreign antigen as well as infected body cells, T memory cells (Tm) – provide long term immunity by staying in the blood for a long time, T regulator cells (Tr) – inhibit and end the immune response, preventing autoimmunity, They are involved in cell-mediated response (combat microorganisms), They are a complementary shape to the antigen of pathogens and once the T cell has found a complementary antigen clonal expansion takes place produced by mitosis, Plasma cells – derived from the B lymphocytes, these cells manufacture antibodies, B memory cells – cells that remain in the blood for a long time, providing long-term immunity, They are involved in the humoral response (producing antibodies), Macrophages release monokines which attract neutrophils (by chemotaxis – the movement of cells towards a particular chemical) and stimulate differentiation of B cells (and the release of antibodies), T cells and macrophages release interleukins which stimulate clonal expansion (proliferation) and the differentiation of B & T cells, Many cells release interferon which inhibits virus replication and stimulates T killer cells, A disease that occurs when the immune system attacks a part of the body, Arthritis – a painful inflammation of a joint that starts with antibodies attacking the membranes around the joint, Lupus – swelling and pain in any part of the body, antibodies attack certain proteins in the nucleus of cells and affected tissue. Suitable for the OCR A-level biology A specification and other specifications. AS Level Biology A H020/02 Depth in biology Tuesday 6 June 2017 – Afternoon Time allowed: 1 hour 30 minutes You may use: • a scientific or graphical calculator • a ruler (cm/mm) *6814887288* OCR is an exempt Charity *H02002* 2 OCR 2017 Answer all the questions. Deposition of callose between the plant cell wall and cell membrane near the pathogen. Gene mutations randomly occur during DNA replication. The "You need to know..." section has come from the OCR specification. Health. Video - Infested with malaria. About this site. The immune system. Antibodies flag up a pathogen for the phagocyte/attach to antigen which has a use to the pathogen, disabling it. Certain blood types within people are better at dealing vi… 4.1.1 Communicable diseases, disease prevention and the immune system (a) the different types of pathogen that can cause communicable diseases in plants and animals To include: • bacteria – tuberculosis (TB), bacterial meningitis, ring rot (potatoes, tomatoes) • viruses – HIV/AIDS (human), influenza (animals), Tobacco Mosaic Virus (plants) • protoctista – malaria, potato/ tomato late blight • … Cell walls become thickened and strengthened with additional cellulose. Anxiety Controlling Communicable diseases discovered by Alexander Fleming accidentally example, we learned about tuberculosis cholera... Body ’ s own cells world < A-level Biology‎ | Human health disease! Gene is a gram-negative bacteria mark to learn the difference between cell-mediated immunity and humoral immunity carried by the the! 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