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BIOLOGICAL MOLECULES A LEVEL BIOLOGY EXAM WITH QUESTIONS AND CORRECT ANSWERS.
What is a non-reducing sugar? - Correct Answers -~ Some disaccharides like sucrose How to evaluate the concentration of reducing sugar? - Correct Answers -~ Filter the solution and weigh the precipitate ~ Remove the precipitate and use a colorimeter to measure the absorbance of light of remaining solution - Each colour of precipitate lets a certain amount of light through Describe the test for starch (E.g. amylopectin & amylose)? - Correct Answers -~ Add iodine dissolved in potassium iodide solution to the sample ~ Positive result means it will go from browny-orange to a blue-black colour Describe the structure of triglycerides? - Correct Answers -~ Have one molecule of glycerol with 3 fatty acids attached ~ Fatty acids made of hydrocarbons ~ The tails are hydrophobic so makes triglycerides insoluble
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