Identification of Carbohydrates, Lipids and Proteins Lab

Question 1

how do you test for the presence of reducing sugars within a solution

Answer 1

add benedicts solution to a boiling sample of the original solution

Question 2

what does a positive benedict solution test look like

Answer 2

the solution will change to a green, yellow or orange colour

Question 3

how do you test for the presence of starches within a solution

Answer 3

add a few drops of iodine to the specimen

Question 4

what does a positive iodine test look like

Answer 4

the specimen will change to either a dark blue or black colour

Question 5

how do you test for the presence of fats within a solution

Answer 5

place them on a sheet of unglazed brown paper

Question 6

what does a positive test for fats look like

Answer 6

the substance will soak through the piece of paper

Question 7

how do you test for proetines within a solution

Answer 7

add biuret reagent solution to the substance

Question 8

what does a positive test for proteins look like

Answer 8

the solution will change to either purple or pink

Question 9

what is a polymer

Answer 9

any natural or synthetic substance that is composed of macromolecules