Food testing Flashcards
(15 cards)
What is the purpose of food testing in biology?
To identify the presence of specific nutrients in food.
True or False: Benedict’s test is used to detect reducing sugars.
True
What color indicates a positive result in the iodine test for starch?
Blue-black
Fill in the blank: The test for proteins is called the __________ test.
Biuret
What is the main reagent used in the test for lipids?
Ethanol
Multiple choice: Which of the following tests is used for detecting starch?
A) Benedict’s test
B) Iodine test
C) Biuret test
B) Iodine test
What is the expected color change when a reducing sugar is present in a Benedict’s test?
Brick red
True or False: The Biuret test will turn purple in the presence of amino acids.
True
What is the purpose of the ethanol emulsion test?
To test for the presence of lipids.
Fill in the blank: A positive test for lipids produces a __________ layer.
Cloudy
What is the first step in conducting the iodine test?
Add a few drops of iodine solution to the food sample.
Multiple choice: Which nutrient does the Biuret test detect?
A) Carbohydrates
B) Proteins
C) Lipids
B) Proteins
True or False: A blue color in the Benedict’s test indicates the absence of reducing sugars.
True
What type of food would you test for lipids?
Fats or oils, such as butter or olive oil.
What happens to the color of the iodine solution when it reacts with starch?
It changes from brown to blue-black.
