B2 -orginisation Flashcards
What is the purpose of food tests in biology?
To identify the presence of specific nutrients in food.
True or False: Benedict’s test is used to detect proteins.
False
Which test is used to detect the presence of starch?
Iodine test
Fill in the blank: The ______ test is used to detect reducing sugars.
Benedict’s
What color change indicates a positive result for the iodine test?
Blue-black
What reagent is used in the biuret test for proteins?
Biuret reagent
Multiple Choice: Which of the following tests is used for lipids? A) Benedict’s B) Iodine C) Sudan III D) Biuret
C) Sudan III
True or False: A positive Benedict’s test shows a color change from blue to green, yellow, or brick-red.
True
What is the positive result color for the biuret test?
Purple
Fill in the blank: The presence of lipids is tested using ______.
Sudan III
What is the main component tested for in the iodine test?
Starch
Short Answer: What color does Sudan III turn in the presence of lipids?
Red-stained layer
Which food test would you use to identify glucose?
Benedict’s test
True or False: The iodine test can be used to test for sugars.
False
What is the first step in conducting a Benedict’s test?
Mix the food sample with Benedict’s reagent.
Multiple Choice: Which of the following nutrients does the biuret test detect? A) Carbohydrates B) Proteins C) Lipids D) Vitamins
B) Proteins
Fill in the blank: A negative result in the iodine test remains ______.
Brown
What is the significance of the color change in food tests?
It indicates the presence of specific nutrients.
Short Answer: What temperature is required for the Benedict’s test?
Heat to 80°C or higher.
True or False: The Sudan III test is used for carbohydrates.
False
