Learn vocabulary, terms, and more with flashcards, games, and other study tools. A-LEVEL BIOLOGY OCR NOTES. Mainly manufactured in the liver and the intestines. A level Biology ... A-Level OCR Biology Flashcard Maker: Louis Palfrey. • membrane formation and the creation of hydrophobic barriers, Roles of lipids in long term energy storage, • thermal insulation to reduce heat loss, for example in penguins. Biological … The higher the glucose concentration, the higher the transmission and the lower the absorption. The following outlines the topics and exam structure. Quaternary protein made from four polypeptides, two alpha amd two beta subunits. With the use of a colour coded chart, the concentration of a sugar can be determined. Multiple Choice Questions (MCQ) topic quiz - answers. 3.1 Biological Molecules; 3.2 Cells The membranes are described as a fluid-mosaic model due to the mixture and movement of the phospholipids, proteins, glycoproteins and glycolipids it is made of. This leads to long chains of amino acids folding into complex structures, Distance travelled by component ➗ distance travelled by solution, • type, number and sequence of amino acids, • oxygen, hydrogen and nitrogen atoms of the basic structure interact, • folding of a protein into it's final shape, • the association of two or more individual proteins called subunits, • proteins are assembled in the aqueous cytoplasm. Metabolic reactions that need energy include: Active Transport – moving ions and molecules across a membrane against a concentration gradient. Alevel subjects OCR Biology Ocr as biology notes Carbon can form so many different molecules because it has a valency of 4 which means it can form 4 single covalent bonds with 4 other atoms. Find A Level Biology past papers, worksheets and revision materials on Maths Made Easy. Haemoglobin is a globular protein made of 4 polypeptide chains (2 alpha chains and 2 beta chains), bonded together. CIE O Level Notes; A-Level. Unsaturated fats are a much more healthy component of our diet than saturated fats. The calorimeter is a device that shines a beam of light through a sample. When a polysaccharide forms from glucose in this way, it is unable to coil or form branches so a straight chain molecule is formed. All living organisms need energy to drive their biological processes in order to survive. One double bond is monounsaturated and two or more double binds is polyunsaturated. Collagen is a member of a family of naturally occurring proteins. Steroid alcohols (another type of lipid found in cells). Large proportion of sulfur containing amino acid, cysteine. A molecule of water is lost and a new bond is formed between carbon 1 and 4, known as a 1-4 glycosidic bond. This causes the molecules to vibrate and break the bonds holding the tertiary structure in place as most of the bonds holding the tertiary structure in place are quite weak (not covalent – hydrogen, ionic, hydrophilic or hydrophobic bonds), so they are easily broken. Hydrogen bonds form between the chains, which gives the structure strength. All Notes; Biology; Biological Molecules; Biological Molecules They have dual hydrophobic/hydrophilic properties. If it is not in liquid form, grind it up or blend it with water. Polymers have different uses that depend on their properties. OCR A Level Biology exam revision with questions & model answers for Biological Molecules 1 | Multiple Choice. ... as well as exam questions and mark schemes for some lessons Follows the New OCR A Level Biology [A] Specification, could be adapted to other exam boards Lessons follow the Oxford A Level Biology for OCR Textbook. A molecule of water is lost and a new bond is formed between carbon 1 and 4, known as a 1-4 glycosidic bond. Click on the resouces below. OCR Biology – Spec at a glance. Each quiz consists of 12 questions and you have ten minutes to complete the quiz. Made by expert teachers. 4.7 29 customer reviews. Hydroxyl group is polar and hydrophilic and the rest of the molecule is hydrophobic. It is one of the most plentiful proteins present in mammals and it is responsible for performing a variety of important biological functions. Register Free. If solution changes colour from yellow/brown to purple/black the result is positive. The molecules are slightly polar because the oxygen nucleus pulls the shared electrons away from the hydrogen nuclei. FREE Revision guides, questions banks and resources. Pursuing Medicine - AS Journey OCR AS A BIOLOGY BREADTH PAPER 25th May 2017 How much harder is A level biology than GCSE biology? If you are not sure of the correct answer, use what you do know to narrow down the possibilities. Biology A 2.1.2 Biological molecules. They have a prosthetic group which is the haem group – they have 4 haem groups. 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. All amino acids have the same basic structure but they all have different variable R groups. It binds oxygen in the lungs and releases it in the tissues. A condensation reaction in which the hydorxyl groups on the fatty acids and glycerol interact, leading to the formation of three water molecules and bonds (ester bonds) between the fatty acid and glycerol molecule. The more concentrated a solution is, the more light it will absorb and the less it will transmit. Giving the oxygen nuclei a δ- charge, and the hydrogen nuclei a δ+ charge. The Benedict’s Test reveals the presence of reducing sugars by producing an orange-red precipitate. Metabolism is the sum total of all the biochemical reactions (anabolic and catabolic) taking place in the cells of an organism. Lipids are made of the elements Carbon, Hydrogen and Oxygen, although they have a much lower proportion of water than other molecules such as Carbohydrates.They are insoluable in water. Any OCR AS BIOLOGY biological molecules past questions? 1. Collagen is a fibrous protein which is an important structural component in cell walls as it’s very strong. Lipids are biological molecules that contain the elements carbon, hydrogen and oxygen. There is also a starter or plenary ‘bingo’ activity that consolidates key terms. Collagen can form bones, cartilage and connective tissue. Cholesterol is present in some membranes too and this will restrict the lateral movement of other molecules in the membrane. A Level Biology Revision for AQA, OCR or Edexcel. ; Anabolism– synthesis of large molecules from smaller ones, e.g. Close. Read more. Group of fibrous proteins present in hair, nails and skin. So if you’re revising Digestion for AQA A-Level Biology, you can find all of the Digestion questions that have been ever asked by AQA in one single document - useful, no? Summary notes, flashcards and past exam questions by topic for AQA Biology AS and A-Level Topic 1 - Biological Molecules Animals contain saturated triglycerides or solid fats. Do not react with benedict's so the solution remains blue eg sucrose is non-reducing. Collagen can give strength in the walls of arteries to withstand high pressure as well as the tendons to connect skeletal muscles to bonds. They are called surface active agents or surfacants. This section of Revision Science covers the topics that comprise the A-Level Biology topic Biological Molecules, including: Essential Substances, Lipids, Carbohydrates, Proteins, Biochemical Tests and the Importance of Water. OCR ‘Jelly mods’ biological molecules activity allows students to build biological molecules of varying complexity and explore the concepts of structure and bonding. Addition polymers are made from molecules containing C=C bonds. Resulting solution is then mixed with water and shaken. What was the resulting colour? Proteins consist of one or more polypeptides arranged as complex macromolecules and they have specific biological functions. They have extra electrons so are negatively charged, making them soluble in water, Form a layer on water surface with phosphate heads in the water and fatty acid tails sticking out of the water. Instructions and answers for teachers. Microfibrils join together to make macrofibrils which join together to make fibres. For each of the papers below, there are revision notes, summary sheets, questions from past exam papers separated by topic and other worksheets. Notes. Not soluble in water. The OCR A level Biology course is made up of 6 modules: 1.Development of practical skills in biology The OCR A level Biology specification is demanding with a wide breadth of content, data analysis and mathematical skills forming major parts of the course. This enables haemaglobin to transport oxygen around the body. Amino acids join when amine and carboxylic acid groups connected to central carbon atom react. When many amino acids are joined by peptide bonds. Lipids perform many functions, such as: Energy Storage; Making Biological Membranes Fibres are strong and insoluble and are used to make cell walls. (i) compare the structure and function of haemoglobin (as an example of a globular protein) and collagen (as an example of a fibrous protein), (s) describe how the concentration of glucose in a solution may be determined using colorimetry. The oxygen atom has a greater pull on the shared electrons than the hydrogen atoms so the oxygen atom becomes slightly negatively charged and the hydrogen atom becomes slightly positively charged so that there is an uneven charge distribution across the molecule, making water polar. OCR (A) A-Level Biology Revision. 1. Commonly known as fats or oils, they are molecules formed from carbon, hydrogen and oxygen. This will tell you how much Benedict’s solution has been used up. A-LEVEL OCR BIOLOGY CHEATSHEET PACK. Module 2: Foundations in Biology. Made by expert teachers. Biological processes H420/01 - Sample question paper and mark scheme. Adds stability to cell membranes and regulates fluidity by keeping membranes fluid at low temps and stops them becoming too fluid at high temps. A few drops of iodine dissolved in potassium iodide solution are mixed with a sample. Sample Decks: 2.1.1 Cell Structure (Foundations in Biology), 2.1.2 Biological Molecules (Foundations in Biology) , 2.1.3 Nucleotides and Nucleic Acids (Foundations in Biology) Show Class A level Biology . Important role in the formation of cell membranes, becoming positioned between phospholipids with hydroxyl groups at the periphery of the membranes. Biological molecules multiple choice This site is intended as an educational resource. Start studying Biology A- Level: Biological Molecules. Covalent bonds, called cross-links, form between other collagen molecules, adds to the strength. Author: Created by HenrikHanson. Polymers made up of amino acid molecules. These levels begin with the systems, then the organs, tissues, cells and organelles. Different R groups of amino acids can interact with each other forming different types of bond. Start revising A-level & GCSE with 7 million other students. When two alpha glucose molecules are side by side, the two hydroxyl groups react and when this happens bonds are broken and new bonds reform. A-Level Year 1 & AS- Level Biology Biological Molecules Revision Workbook. Complex alcohol structure based on a four carbon ring structure with a hydroxyl group at one end. 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, Cell Division, Cell Diversity and Cellular Organisation, B1.6 Waste materials from plants and animals, Place the solution in a sample chamber between the light and the photoelectric cell in a, If there is an unknown sample, use the graph to. A water molecule is used to break the peptide bond, reforming the amine and carboxylic acid groups. These instructions cover the learner activity section which can be found on page 13. This causes it to have a branched structure. NEW OCR A Level Biology - Biological Molecules. Home › Biology Revision › OCR (A) A-Level. Water molecules consist of 2 hydrogen molecules covalently to an oxygen molecule. b) describe, with the aid of diagrams, the structure of an amino acid, c) describe, with the aid of diagrams, the formation and breakage of peptide bonds in the synthesis and hydrolysis of dipeptides and polypeptides. OCR (A) A-Level Biology We have worked hard to compile every past paper by topic and exam board! It is most well-known for the structural role it plays in the body. Biological Molecules Paper 2. If enough heat is applied, the whole tertiary structure can unravel and the protein will no longer function – this is called denaturation. Large complex molecules, not built from repeating units, Lipids that are solid at room temperature, Lipids that are liquids at room temperature, Made by combining one glucose molecule with three fatty acids. Cellulose molecules make hydrogen bonds with each other. Notes. The more reducing sugar there is present, the more precipitate will be formed, and the more Benedict’s solution (copper sulfate) will be ‘used up’. Degree of disulfide bonds determines the flexibility eg hair contains fewer bonds than nails which is why it's more flexible, • fibrous protein found in elastic fibres. For Beta glucose molecules to join together, alternative glucose molecules have to be turned upside down. This website makes use of cookies. If a white emulsion forms as a layer on top of the solution, the test is positive. OCR. The shared electrons between the oxygen and hydrogen atoms in water are not shared evenly. These are the same elements found in carbohydrates, but unlike carbohydrates, lipids have a lot less oxygen). In the benedict's test, the colour produced is dependent on the concentration of reducing sugar present in the sample. ... Molecules, biodiversity, food and health insert F212 - … When two alpha glucose molecules are side by side, the two hydroxyl groups react and when this happens bonds are broken and new bonds reform. The sites linked to here are not maintained by me, although I have checked … Each subunit contains a prosthetic haem group and the iron ions are each able to combin reversibly with an oxygen molecule. Biological Molecules. Lipids are non-polar molecules, or uncharged, and therefore are insoluble in water. Phosphate ions (PO4 3-) are found in the cytoplasm of every cell. They will dissolve in organic solvents, such as ethanol. 1 A 0.5 mol dm3 solution of sucrose was heated at 80 °C for 5 min with Benedict’s reagent. A molecule containing carbon, hydrogen and oxygen only, Single sugar eg glucose, fructose and ribose, When two monosaccharides join together eg lactose and sucrose, When two or more monosaccharides are joined together they form a polymer eg glycogen, cellulose and starch, Hexose monosaccharide which forms the basic building blocks of many biologically important large carbohydrates, Polar and soluble in water (allows them to be dissolved in the cytosol of cells) because of hydrogen bonds that form between the hydroxyl groups and water molecules. OCR A Level Biology exam revision with questions & model answers for Biological Molecules 1. Place sample to be tested in a boiling tube. 60% of … Maltose. Our body cannot make 8 of them and we have to get these from what we eat. Peptide bond formed and H2O molecule lost. Heating a protein increases the kinetic energy in the molecules. 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