Gcse biology mark scheme unit 3 biology higher january. It is packed full of tasks, quick questions and illustrated diagrams. Enzymes work best when there is a high enough substrate concentration for the reaction they catalyse. The ph must be correct for each enzyme to work at its best. Choose from 500 different sets of chapter 1 life processes biology igcse flashcards on quizlet. So it is used in the krebs cycle, because the phosphate is actually coming from the 4c molecule, rather than a freestanding phosphate from somewhere else in the body. They fit together to form an enzymesubstrate complex. The substrate fits into the enzymes active site like a key fits into a lock. The direct transfer of a phosphate group from an intermediate compound to adp to form atp. Enzymes and digestion gcse biology single science revision. This could be done from memory, of gcse biology or a level topics already covered, or by researching using the internet or any gcse textbook. C enzyme substrate complex 3 the way in which an enzyme works. When the substrate binds to the active site of the enzyme, a reaction can take place.
In order to fully prepare yourself for the alevel biology course complete the following tasks to the best of your ability using your gcse biology notes and the suggested resources. Edexcel igcse revision notes written by tim filtness 5 the envelope is used to gain entry into host cells. Ks4gcse biology enzymes resources for dyslexics oaka books. Gcse biology revision covering cell activity, genetics and dna, green plants as organisms, humans as organisms, living things in their environment, polymerisation of amino acids, the human body in action. Investigating the effect of substrate concentration on the rate of hydrogen peroxide breakdown by catalase offers the opportunity for students to carry out serial dilutions.
D activation energy 4 a substance which changes the rate of a. Key notes matched to the specification, some past apper quetsions and answers, key fact quiz at the end. The space in an enzyme where the substrate fits during an enzymecatalysed reaction. Ccea gcse specimen assessment materials for biology. Lesson describes how ph, temperature and substrate concentrate affects. Each enzyme is specialized for one reactant substance. Welcome to a level biology, please complete all of the following tasks ready for your first day at new college. It is part of a suite of gcse qualifications offered by edexcel. The ks4 gcse biology enzymes revision pack is an engaging, fully illustrated topic pack, breaking formation down into short chunks and enabling pupils to process complicated concepts more easily. Aqa biology gcse revision summary booklet teaching resources.
The international gcse biology is of the same level as a gcse and is examined by edexcel, one of the uks most trusted examination boards. Buy aqa gcse biology student book 3 by fullick, ann, ryan, lawrie isbn. Biological catalysts enzymes alevel biology revision notes. Feel free to ask any questions came with a sticker on the front cover. Edexcel international gcse 91 human biology student book phil bradfield and steve potter ebook included teacher resource pack. Introduction why choose aqa for gcse biology our philosophy. Light and electron microscopes allow us to see inside cells. This reactant substance is called substrate, and it is specialized for one type of. Contains a variety of activities and resources to support the learning of enzymes. B enzyme 2 the special site in the structure of an enzyme where the substrate binds.
However, the questions often have two answers that could, at first glance, be correct. Blank page this annotation must be used on all blank pages within an answer booklet structured. How enzymes react under the influence of temperature and ph. Mar 16, 2019 these match up with the aqa gcse biology course. Here is where you will find all my biology gcse slop booklets. This reactant substance is called substrate, and it is specialized for one type of reaction or for a few reactions. The substrate are the reactants in a reaction and the enzyme lowers the activation energy needed to form the products. If too little substrate is available the rate of the reaction is slowed and cannot increase any further.
These specimen assessment materials should be used in conjunction with cceas gcse biology specification. Multiple choice questions are perhaps the easiest to complete you simply put a cross in a box. Plant, animal and bacterial cells have smaller components each with a specific function. Effect of temperature, substrate concentration and ph on reaction. Enzymes and substrates collide to form enzymesubstrate complexes. Aqa biology gcse revision summary booklet tes resources. The carrying out of any these practical activities would relate to part of the ocr biology practical endorsement pag4 and could cover the following learning outcomes. Adaptations adaptations student booklet gcse biology. Learn chapter 1 life processes biology igcse with free interactive flashcards. Enzymes are described as being specific to a substrate.
Suggestions for practical activities are included, designed to help develop the required experimental skills, with full guidance included on the cdrom. Essential facts are carefully organised to help students revise effectively helpful tips provide guidance on how students can improve their grades sample questions and. Edexcel new 91 topic 1 l4 enzymes teaching resources. These have been made according to the specification and cover all the relevant topics in the syllabus for examination in mayjune as well as octobernovember and march. Key terms include catalyst, active sites and substrate.
Sometimes, if too much product accumulates, the reaction can also be slowed down. All enzymes are globular proteins with a specific tertiary shape. Aqa gcse biology, paper 2, topic 6 inheritance, variation and evolution advantages of sexual reproduction. Super helpful a little messy but still very useable check out my other revision guides and textbooks for a bundle deal. An enzyme will only work on one substrate it is substrate specific.
It really brings the topic to life and is perfect for use both in lesson and as homework. Enzymes are biological catalysts which speed up reactions. Biological molecules revision notes a biology gcse. Gcse biology revision notes 2015 scool the revision website.
This happens because the enzymes shape, especially the active site. Enzymes are specific to one particular substrates as the active site of the. Sometimes, if there is too much product accumulating, the reaction can also be slowed down. These specimen assessment materials should be used.
It states that the shape of the active sites of enzymes are exactly complementary to the shape of the substrate. Enzymes work best when they have a high enough substrate concentration for the reaction they catalyse. Tes global ltd is registered in england company no 02017289 with its registered office at 26 red lion square london wc1r 4hq. Investigating the effect of substrate concentration on the rate of hydrogen peroxide breakdown by catalase. Enzymes gcserevision, biology, cellactivity, proteinsand. Enzymes rate of reaction, edexcel 91 gcse biology, topic. Gcse biology topic 1 key concepts in biology 42 terms. Revise enzymes with bbc bitesize for gcse combined science, edexcel. May 19, 2012 this video describes how enzymes work. When a substrate molecule collides with an enzyme whose active site shape is complementary, the substrate will fit into the active site and an enzyme substrate complex will form. Aqa gcse mark scheme 2011 january series 6 bly3h question 2 question answers extra information mark 2a to kill other micro organisms in the milk to sterilise allow germs ignore viruses allow destroy ignore pasteurise 1 2bi 0. Different enzymes work best at different ph values.
For example, enzymes in the stomach have an optimum ph of about 2 because the stomach is acidic, but intestinal enzymes have an optimum ph of about 7. As the substrate concentration rises, the rate of reaction rises because theres more substrate mol. They are usually specific to only one reaction the part of the enzyme that acts a catalyst is called the active site. This can be viewed as a presentation or printed as a booklet. Substrate molecules have a complimentary shape to the active site of an enzyme e. This website and its content is subject to our terms and conditions. Thats why we have a suite of science qualifications for key stage 4. Aqa gcse sciences student book answers separate sciences. This is a required practical so its important that you learn the details. Feel free to try them out and edit them to suit your needs but do not sell them gcse biology.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. When you have completed the booklet collect a mark scheme and mark your work. More questions over 100 in each booklet more maths in biology graphs, percentage increases, standard form etcmore literacy support refutation texts, graphic organisersinterleaving from prior. A key difference is that igcse biology does not include practical course work, making it convenient for distance learners.
Sep 18, 2016 full 50 minute lesson contain covering the new 91 edxcel gcse biology specification. Aqa gcse 91 biology 1 paper 1 separate science past exam. Gcse biology science revision section looking at enzymes, lock and key. Enzymes gcserevision, biology, cellactivity, proteins. Igcse biology edexcel biology distance course oxford. Aqa biology unit 4 substrate level phosphorylation. They do this by lowering the activation energy required for the reaction to proceed. Gcse biology revision notes 2015 scool, the revision.
Enzymes are much more specific than other catalysts. It covers the content being taught in year 10 and has questions for students to answer at the end of each section. The activity is split into 9 tasks these should not take more than 6 hours to complete. This will then be used to fully support you in the first weeks and ensure that you can plan your independent study accordingly. Also contains an extended writing task in which pupils have to complete a 6 mark question. Igcse biology edexcel biology distance course oxford open.
Written by an experienced teacher and examiner, cambridge igcse biology coursebook with cdrom third edition gives comprehensive and accessible coverage of the syllabus content. Gcse biology mark scheme unit 3 biology higher january 2011. However, after the optimum ph is reached the enzyme begins to change shape and the active site stops being able to bind to the substrate. The enzyme becomes denatured and stop working the rate of reaction is zero at this point. Feeding relationships topic year 9 student booklet. The rest of the enzyme is much larger and is involved in. You can print the booklet, write on the pdf file or answer the questions on paper. Written by experienced authors to cover the new ccea gcse biology specifications in full, this revision book provides students with all the ingredients for exam success. Jan 14, 2018 1 which graph shows the effect of temperature on the activity of an enzyme.
Enzymes are affected by the hydrogen ion concentration ph and the temperature. Full 50 minute lesson contain covering the new 91 edxcel gcse biology specification. Youll see that our gcse biology, along with chemistry and physics, is a clear. Ive taken the excellent work done by a large group of biology teachers and updated them to include. Ccea gcse specification in biology for first teaching from september 2011 for first assessment from summer 2012 for first award in summer 20 subject code.
We believe that science has something to offer every student. Just follow the link and print the page or save it as a pdf file. Oxford open learnings international gcse biology course is designed to prepare students for the edexcel syllabus 4bi1. The capsid is a protein coat and is used to protect the genetic information and give the virus structure the dna or rna a different type of nucleic acid contain the. Show your teacher how much progress you have made and justify a better estimated grade with a love biology certificate of achievement. Enzymes are biological catalysts that speed up the rate of the majority of chemical reactions that occur in the cell.
At higher conc, all of the active sites become filled enzyme is saturated so rate of reaction remains same. This active site fits a specific molecule called a substrate. Cambridge igcse biology textbook pdf by dg mackean and hayward. Enzymes rate of reaction, edexcel 91 gcse biology, topic 1 key concepts in biology. The substrate are the reactants in a reaction and the enzyme.
Aqa gcse sciences student book answers separate sciences download answers to the practice and summary questions in your aqa gcse sciences 91 biology, chemistry and physics student books. Blank page this annotation must be used on all blank pages within an answer booklet structured or unstructured and on each page of an additional object where there is no candidate response. If the conditions are too alkaline or acidic then the activity of the enzyme is affected. Enzymes are essential, the rate of most reactions would be too slow without them and the cell would fail to keep up with the biochemical demands. Effect of substrate concentration on rate of reaction. The enzyme can then break down the substrate into smaller products or combine two smaller substrates. The optimum ph for an enzyme depends on its site of action. This booklet was produced to help students studying the cambridge igcse biology syllabus. Enzymes are denatured at extremes of temperature and ph. A level biology summer independent learning activity. In this video, we look at how to investigate the effect of ph on the enzyme amylase. Only one type of substrate can fit into the active site of an enzyme, like. Initially, increasing the ph increases the rate of reaction.