chapter 6

Question 1

what’s a positive control and give an example of it for the macronutrient lab

Answer 1

a positive control is a result that is expected to test positive in a lab

ex. substance with protein causes the biuret test to be pink/purple

Question 2

Define negative control and give an example of it from the macronutrient lab

Answer 2

a test in a lab that is intended to yield a negative result

ex. distilled water for any of the macronutrient tests

Question 3

what are the 4 macromolecules that are commonly tested

Answer 3

starch
sugar
protein
fat

Question 4

what is the test for starch and what’s the expected color change

Answer 4

Iodine

Yellow to
Brown, Black

Question 5

what is the test for sugar and what’s the expected color change

Answer 5

Benedict

Blue to Red, Yellow, Green

Question 6

what is the test for fat and what’s the expected color change

Answer 6

Brown paper

opaque to translucent

Question 7

what is the test for protein and what’s the expected color change

Answer 7

Biuret

Blue to Pink, Purple