1 Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct? A
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1 1 Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct? mino acids are basic units of carbohydrates. Fatty acids are basic units of glycogen. Glycerol is a basic unit of oils. Simple sugar is a basic unit of protein. 2 When a substance is added to meat, are produced. What is this substance? a hormone an enzyme an oil water 3 The diagram shows part of a protein molecule. X What does X represent? amino acid fatty acid glycerol sugar PhysicsndMathsTutor.com
2 4 Four different foods were tested for their composition. The results are shown in the table. Which food contains protein but not reducing sugar or starch? enedict s test iodine test biuret test blue black blue brown purple purple brick red black blue brick red brown blue 5 What are the smaller basic units of starch and glycogen molecules? starch simple sugars simple sugars glycogen fatty acids and glycerol simple sugars fatty acids and glycerol simple sugars 6 The diagram represents a protein molecule. What do the small circles represent? fatty acids glycerol simple sugars PhysicsndMathsTutor.com
3 7 Which row shows the elements and basic units that are used in the construction of large food molecules? food molecules elements basic units fats carbon, hydrogen, oxygen, nitrogen glucose fats carbon, hydrogen, oxygen, nitrogen glycerol starch carbon, hydrogen, oxygen glucose starch carbon, hydrogen, oxygen glycerol 8 Which nutrient produces a purple colour when mixed with biuret solution? fat protein reducing sugar starch 9 Which simple molecules are the basic units of protein? fatty acids sugars vitamins 10 Which food-testing reagent shows a positive result when it turns from blue to purple? enedict s solution biuret reagent ethanol iodine solution PhysicsndMathsTutor.com
4 11 The diagram shows two food tests carried out on solution X. test 1 test 2 biuret solution enedict s solution red colour heat solution X purple colour solution X Which nutrients are present in solution X? protein and starch protein and sugar starch and fat starch and sugar 12 The data show the concentrations of sugar and starch in an onion. total sugar including reducing sugar / g per 100g 3.7 starch / g per 100g 0. The onion is tested with enedict s solution and iodine solution. Which set of results is correct? enedict s solution iodine solution blue blue blue-black brown brick red blue-black brick red brown PhysicsndMathsTutor.com
5 13 The diagram shows two food molecules before and after they have been digested by enzymes. P R Q S before after What identifies the products of fat digestion? P and R P and S Q and R Q and S 14 Four foods were tested for each of the following nutrients: fat (using ethanol); protein (using the biuret test); reducing sugar (using enedict s solution), Which food contains protein and fat? PhysicsndMathsTutor.com
6 15 The graphs show the quantities of selected vitamins and mineral ions in four foods. vitamin mg per 100 g vitamin µg per 100 g iron mg per 100 g calcium mg per 100 g beans egg fish fruit beans egg fish fruit beans egg fish fruit beans egg fish fruit Which food is the richest source of the vitamin or mineral ions essential for the transport of oxygen by the blood? beans egg fish fruit 16 human cell contains a length of N that carries the code for making which substance? fat glycogen lipase starch 17 student set up a test-tube containing starch, water and amylase. How could the student test whether the amylase had digested all the starch? dd iuret solution. dd dilute hydrochloric acid. dd iodine solution. Weigh the test-tubes and contents before and after the experiment. PhysicsndMathsTutor.com
7 18 When solution X is tested with iodine solution, a blue-black colour is observed. different solution, Y, is added to a new sample of solution X and the mixture is shaken and left for 30 minutes at 40. When tested with iodine solution, an orange-brown colour is observed. What are solutions X and Y? X Y maltose amylase maltose lipase starch amylase starch lipase 19 Which row correctly identifies the chemical elements found in proteins? carbon hydrogen oxygen nitrogen key = present = absent PhysicsndMathsTutor.com
8 20 Nutrients are made up of smaller basic units. Nutrients can be identified by food tests. Which nutrient is a protein? nutrient smaller basic units food test sugars sugars enedict s test biuret test enedict s test biuret test 21 Which pair of substances is transported in the phloem? and protein and sucrose protein and starch starch and sucrose 22 Water is a good solvent. What does this mean? It dissolves well in many other substances. It flows easily through vessels. It is permeable to gases. Many substances dissolve well in it. 23 What does the digestion of starch produce? fatty acids glucose mineral salts water PhysicsndMathsTutor.com
9 24 Which solutions are used for testing for protein, reducing sugar and starch? 25 The diagram shows part of a starch molecule. Which diagram shows this molecule after it has been completely digested? PhysicsndMathsTutor.com
10 26 Four foods were tested for fat (using ethanol), protein (using the biuret test), reducing sugar (using enedict s solution), starch (using iodine solution). Which food contains protein and starch? colour of result of food test blue / black purple / lilac bric-red / orange milky-white key = nutrient present = nutrient absent 27 The diagram shows a section through an eye. X Y What are structures X and Y? organs in an organ system organs in a tissue organ systems in an organ tissues in an organ PhysicsndMathsTutor.com
11 28 Which elements do carbohydrates contain? carbon, hydrogen and oxygen carbon, hydrogen and sulphur carbon, nitrogen and oxygen carbon, nitrogen and sulphur PhysicsndMathsTutor.com
4 Biological Molecules
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