P3 InfoSheet 2016 hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: LIFE SCIENCES: PAPER III – INFORMATION SHEET Page i of ii INFORMATION SHEET Protein is found in many of the foods we eat and is essential for the proper growth and development of individuals. In newborn babies and developing children maximising the protein content of milk is essential for growth. TESTING FOR PROTEIN USING BIURET SOLUTION This indicator makes use of two solutions in conjunction with one another; Biuret solution A (light blue in colour) and Biuret solution B (clear). In the presence of protein, a lilac/purple colour can be detected as the combination of the two Biuret solutions reacts with the protein. MILK IS AN OPAQUE LIQUID Milk is a white, opaque liquid. There are different particles suspended in the milk. Light does not pass clearly or easily through pure milk as the particles in milk 'block' the flow of light and it is difficult to detect colour changes. When there are no particles, as in water, or fewer of these particles present, colour changes are easier to detect. In water there are no particles present that block the flow of light and so light passes through the substance easily. Glass of milk Glass of water [Examiner's photograph] IEB Copyright © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: LIFE SCIENCES: PAPER III – INFORMATION SHEET Page ii of ii Refer to this information for Question 18. PROTEIN FOOD AMOUNT g/100 cal Tempeh 1 cup 9,3 Seitan 85 grams 22,1 Soybeans, cooked 1 cup 9,6 Lentils, cooked 1 cup 7,8 Black beans, cooked 1 cup 6,7 Kidney beans, cooked 1 cup 6,4 Veggie burger 1 cup 13,0 Chickpeas, cooked 1 cup 4,2 Veggie baked beans 1 cup 5,0 Pinto beans, cooked 1 cup 5,7 Black-eyed peas, cooked 1 cup 6,2 Tofu, firm 113 grams 11,7 Lima beans, cooked 1 cup 5,7 Quinoa, cooked 1 cup 3,5 [Adapted from: <http://www.bellinghamdistanceproject.com/training/runners-protein> Accessed 22 Jan. 2016] IEB Copyright © 2016