What color change indicates a positive result for the presence of starch when iodine is added?

Biochemical Tests in A-Level Biology

Interactive Video
•
Biology, Chemistry, Science
•
11th Grade - University
•
Hard

Liam Anderson
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Blue to green
Orange to blue-black
Purple to pink
Red to yellow
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which reagent is used to test for reducing sugars?
Iodine
Biuret
Ethanol
Benedict's
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why does the color change occur first at the top of the solution during the reducing sugars test?
The bottom of the test tube is cooler
Due to the presence of more sugar at the top
Because of convection currents
The reagent is denser at the top
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in testing for non-reducing sugars like sucrose?
Use Biuret reagent
Add iodine
Perform a Benedict's test
Add ethanol
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What process is used to break down sucrose into glucose and fructose?
Fermentation
Oxidation
Acid hydrolysis
Reduction
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which reagent is used in the Biuret test for proteins?
Benedict's
Ethanol
Iodine
Biuret
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What indicates a positive result in the emulsion test for lipids?
A blue precipitate
A white emulsion
A clear solution
A red color
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