HUMAN NUTRITION

Detailed explanation-1: -Biuret solution is used to test for protein. It is royal blue initially and changes to violet when it reacts with protein. Brown paper bags are used to test for lipids. The paper bag becomes translucent (allows light to pass through) in the presence of lipids.

Detailed explanation-2: -The brown paper test for lipids is positive when food is placed on the paper and a spot forms which will allow light to pass through it.

Detailed explanation-3: -A complete cholesterol test-also called a lipid panel or lipid profile-is a blood test that can measure the amount of cholesterol and triglycerides in your blood.

Detailed explanation-4: -The pieces of brown paper containing oil, butter and milk each develop a translucent spot, whilst the brown paper with the orange juice and water does not. This indicates that sunflower oil, butter and milk contain fat, whilst orange juice and water do not.