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#33 Food test 4 - Biuret test for Proteins | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. 33 Food test 4 - Biuret test for Proteins. The Biuret Test is done to show the presence of. Which are the basis for the formation of. Hese bonds will make the. Add an equal amount of NaOH. To a solution of the food, mix carefully. Add a few drops of 1% CuSO. Do not shake the mixture. Is a positive result:. The reagent used in the Biuret Test is a solution of copper sulfate. OH is there to raise the pH. Of the solution to alkaline. Levels; the crucial component is the. IGCSE ...

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#156 Food tests observations | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. 156 Food tests observations. Test 1: Starch test. Test 2: Benedict’s test for Reducing sugars. No reducing sugars present. Trace amounts of reducing sugars present. Low amounts of reducing sugars present. Moderate amounts of reducing sugars present. Large amounts of reducing sugars present. Test 3 Emulsion (Ethanol test) for Fat. Test 4: Biuret Test for Proteins. May 4, 2016 at 9:08 AM. October 14, 2016 at 11:25 AM. Subscribe to: Post Comments (Atom). UK Law Revision Notes.

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#139 Food chain | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. Is a chart showing the flow of energy. Food) from one organism to the next beginning with a producer. A food chain usually starts with a. Which gains its energy from the Sun. Used to link each organism to the next represent the direction of energy flow. They always points towards the ‘eater’, and away from the plant. The feeding level is known as the. They make/produce food for other organisms). Animals that eat plants are primary consumers. May 10, 2015 at 5:46 AM. IGCSE Ch...

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Introduction | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. Hello, this is the summary of IGCSE Biology (Cambridge) for 2014 exam. As a student, I have always enjoyed learning Biology and want to make it a fascinating subject for others as well! As references, I am using the following books. And other resources from Internet, including:. Credits to authors of pictures used for illustration purpose on this blog. I'm no expert on Biology so just feel free to leave a comment or any suggestions that could help me improve this blog. Thank...

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#127 Chromosomes, DNA, genes and alleles | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. 127 Chromosomes, DNA, genes and alleles. In the nucleus of every cell there are a number of long threads called. Most of the time, the chromosomes are too thin to be seen except with an electron microscope. But when a cell is dividing, they get shorter and fatter so they can be seen with a light microscope. Human chromosomes and nucleus. Chromosomes are a packaged form of DNA. The DNA normally exists in a non-condensed form in the cell nucleus (upper right). A part of a DNA ...

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#154 Conservation of species, recycling sewage and paper | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. 154 Conservation of species, recycling sewage and paper. Koala is an endangered animal. Is the process of looking after the natural environment. Conservation attempts to maintain or increase the range of different species. Living in an area, known as biodiversity. The need for conservation of species. Many species of animals and plants are in danger of extinction, due to factors such as habitat destruction, the introduction of other species, international trade and pollution.

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# 155 Summary of Human and Ecosystem | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. 155 Summary of Human and Ecosystem. Trapping outgoing long wavelength radiation in the atmosphere and warming. The Earth. Increased concentrations of these gases are causing global warming. Is produced when coal. And other fossil fuels. Dissolves and react in water droplets in the atmosphere, and fall to the ground as acid rain. This leaches aluminum ions from soils, and kills plants and aquatic organisms. Fall-out from accidents at. Reduces the amount of CO. IGCSE Physics H...

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#13 Summary of Classification of Living things | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. 13 Summary of Classification of Living things. Here is a brief summary of previous topics. Things have 7 characteristics. Nutrition, Respiration, Growth, Excretion, Movement, Reproduction and Sensitivity. Living organisms are classified. Into groups according to how closely related they are. Each species of organism is given a unique two-word Latin name called a binomial. The first word of the binomial is the genus. And the second word is the species. Are worm with segmented.

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#153 Pesticides, herbicides, nuclear fallout and non-biodegradable plastics | Biology Notes for IGCSE 2014

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Biology Notes for IGCSE 2014. 153 Pesticides, herbicides, nuclear fallout and non-biodegradable plastics. And stay in the environment for a long time. For example, DDT. Has been a very effective insecticide, used to kill mosquitoes to reduce the spread of malaria. However, because it does not break down, it enters water systems such as lakes, where it is absorbed into plankton. They are unable to excrete DDT. In a similar way to heavy metal, it is passed up the food chain. Are carried by the wind or wate...