Ficks lawficks law is used to measure the rate of diffusion. Openstax biology, modified from original work by mariana ruiz villareal. From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and intricate systems that make life possible. This is where all a level resources will be published. A level biology does pretty much what it says on the tin. Providing study notes, tips, and practice questions for students preparing for their o level or upper secondary examinations.
Diffusion and osmosis igcse biology revision notes by. Atp is required for the rearrangement of microtubules. Transport in animals alevel biology revision notes. Diffusion this a level biology section of revision science explains diffusion and includes the rate of diffusion formula. Download pdf version of all available notes here gce o.
Its been wonderful to see how many countries they have reached and the positive comments that i ha. Alevel biology notes digital teachers ugandadigital. Summary diffusion is the passive movement of molecules from a high concentration to a lower concentration diffusion can also be facilitated by membrane proteins such as channels or carriers osmosis is a waterspecific type of diffusion, where water moves from a high to a low concentration across a selectivelypermeable membrane larger molecules. Below we cover all the topics mentioned in the latest syllabus. Below are biology notes created for the purpose of covering major topics in the cape biology and a level course, some notes present here are also covered in many other syllabuses for colleges and other tertiary institutions so you can scroll through and see which topics you need. Facilitated diffusion movement of solute through a protein channel. This is a practice paper 3 aqa a level biology essay plan. Diffusion, osmosis, active transport there are two ways in which substances can enter or leave a cell. Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy. Covers topics seen in a high school or firstyear college biology course. As biology unit 1 page 2 hgs biology alevel notes ncm711 biology unit 1 specification biochemistry biological molecules biological molecules such as carbohydrates and proteins are often polymers and are based on a small number of chemical elements. Asexualreproductionsbryophytesandferns autotrophicnutrition alevel behaviors alevel cell division cell physiology diffusion, osmosis, active transport cells and tissues.
Diffusion always takes place down a concentration gradient. We provide detailed revision materials for a level biology students and teachers. Download pdf version of all available notes here gce o level singaporecambridge notes. Gce study buddy the best o level revision resource. We aim at making education simple by providing teaching lessons on this platform available for use anywhere, any timestep by step guide here. This covers all the topics and modules for all specifications including 0610. Passive diffusion is the movement of molecules across a membrane, such as a cell membrane. Biology notes form 1 pdf biology form 1 questions and. This is where all as level resources will be published.
These dissolved substances are termed solutes, and water is a solvent. I originally created these videos for my a and as level students so that it would help with revision. If youre ready to pass your alevel biology exams, become a member now to get complete. This pdf not only help you to groom up your general knowledge but also it will help you in one word susbstitution for ssc. There is lateral of diffusion of iaa to the darker cells of the coleoptile.
If youre ready to pass your alevel biology exams, become a member now to get complete access to. Resources for top a1 candidates taking the 2020 singaporecambridge gce o level exam. In this video we are going to discover how cells take in useful substances and remove waste using three methods of transportation. Never wonder about the inner workings of the digestive system again let gojimo fuel your a level biology revision. Simple diffusion and passive transport article khan academy. Since the movement is always down the concentration gradient, it requires no energy. Diffusion this alevel biology section of revision science explains diffusion and includes the rate of diffusion formula. Lesson powerpoint and resources to teach simple and facilitated diffusion to a level biology students. Aug 25, 2016 in this video we are going to discover how cells take in useful substances and remove waste using three methods of transportation. There are many more examples of diffusion in biology. Diffusion is the passive movement of molecules from a high concentration to a lower concentration. Facilitated diffusion requires a channel protein in the cell membrane to. Diffusion and osmosis are both types of passive transport that is, no energy is required for the molecules to move into or out of the cell. For more information on facilitated diffusion, its importance, examples and factors affecting facilitated diffusion, keep visiting byjus biology website or download the.
Diffusion, osmosis, active transport gce study buddy. Cells and microscopy biological molecules enzymes cell membranes and transport the mitotic cell cycle. Read this, paying particular attention to the overview on p11 and then leaf through p35 in order to get an idea of the content you will be covering. It is a special case of diffusion in that the concentrations of solutes in the water can effect how it occurs. Proteins have a variety of functions within all living organisms. Use the link below to download the a level gce biology a specification. The size and nature of the diffusing molecule small molecules diffuse faster than big ones. Characteristics and classification of living organisms revision notes. Within a system, each molecule has its own concentration gradient, and therefore will diffuse irrespective of other molecules. It is a special case of diffusion in that the concentrations of solutes in the water can effect how it occurs since water is a polar molecule, many substances dissolve in it. Downloads saved resources author dashboard add resource my shop tes elements community courses access courses.
Diffusion description diffusion in cells osmosis description partially permeable membranes osmosis in animal and plant cells. Osmosis is a type of simple diffusion in which water molecules diffuse through a selectively permeable membrane from areas of high water concentration to areas of lower water concentration. Diffusion is the net passive movement of particles atoms, ions or molecules from a region in which they are in higher concentration to regions of lower. The net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient, as a result of random movement. Water molecules cluster around molecules of a solute. Tips and notes for english, general paper, and composition writing are also provided. Over 22,000 learners have used our materials to pass their exams. Related articles more from author edexel igcse91 chemistry book free download pdf. Dive in to learn more about the many branches of biology and why they are exciting and important.
Sometimes, large molecules cannot cross the plasma membrane, and are helped across by carrier proteins this process is called facilitated diffusion. Nov 21, 2012 resources for top a1 candidates taking the 2020 singaporecambridge gce o level exam. In past examination many questions were asked from this section in various competitive exams like ssc, railway ntpc, ib exams. Notes from the video a level h2 biology tuition and h1 biology tuition endocytosis and exocytosis in this biology tutorial, we would learn about the process of endocytosis and exocytosis endocytosis is a process to transport macromolecules or molecules in large quantity into the cell. Apr 10, 2019 diffusion is the passive movement of molecules from an area of high concentration to an area of low concentration. A2 biology notes 20162018 all in one here is a pdf file with a2 level biology notes 20162018 cambridge international for you to download. A level biology transition work castle rushen high school. Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration down their concentration gradient. Molecules can move through the cells cytosol by diffusion, and some. May 17, 2017 a2 biology notes 20162018 all in one here is a pdf file with a2 level biology notes 20162018 cambridge international for you to download. Below are biology notes created for the purpose of covering major topics in the cape biology and alevel course, some notes present here are also covered in many other syllabuses for colleges and other tertiary institutions so you can scroll through and see which topics you need.
In facilitated diffusion, a molecule is transported across a membrane with the help of a carrier protein. Click on the popout button on the upper right corner of the pdf file to have full view or click here to download. The small molecules pass from one side of the membrane to the other by moving between the lipid molecules. A level biology revision lesson covering facilitated diffusion. This is actually a special case of diffusion for water molecules only. With all the knowledge youll need to pass your a level exams, gojimo will also provide you with a huge range of questions to test your knowledge, and help you figure out how to improve with detailed answers and explanations. Check where this lesson fits into your exam specification. Energy and respiration photosynthesis homeostasis coordination inherited change selection and evolution. Diffusion, osmosis, active transport gce study buddy the best o level revision resource. It is defined as the movement of water molecules from. Cie o level notes a biology gcse, igcse, ib, alevel. You can find notes and exam questions for additional math, elementary math, physics, biology and chemistry. P4551 indicates the level of numeracy and maths that. A level biology nervous system at colchester county high.
The larger the organism, the more gas exchange needs to take place due to a higher demand for oxygen, but each unit of volume is supplied by a proportionally decreasing surface area. As biology teacher 2 page 3 hgs biology alevel notes ncm715 the stages that lead to atherosclerosis, its effect on health and the factors that increase the risk of its development. O level biology revision notes made for the cie exam boards. Diffusion, osmosis, active transport biologymad alevel. Free pure physics, chemistry, geography and social studies revision notes.
A level biology gas exchange at colchester county high. Since water is a polar molecule, many substances dissolve in it. Diffusion, osmosis and active transport in biology, movement of particles in an out of cells can be described in three ways. The best biology o level notes o and a level notes.
Oxygen, carbon dioxide and most lipids enter and leave cells by simple diffusion. Osmosis is the diffusion of water through a partially permeable membrane. Diffusion is the passive movement of molecules from an area of high concentration to an area of low concentration. Biology notes all in one here is a pdf file with all biology notes for you to download. P3740 details how you will be formally assessed at the end of the course. The nature of plasma membrane its composition and number of pores.