Which three elements make up carbohydrates?
Carbon, nitrogen and oxygen
Carbon, hydrogen and oxygen
Carbon, nitrogen and hydrogen
Which of the following solutions can be used to test for glucose?
Bromine water
Benedict's Reagent
Iodine
What is the colour change observed when iodine is added to starch?
Yellow to blue/black
Blue to red/orange
Yellow to colourless
What is the molecular formula of glucose?
\[{C_6}{H_{12}}{O_6}\]
\[{C_6}{H_{12}}\]
\[{C_6}{H_6}{O_6}\]
Why must starch be broken down into glucose during digestion?
Our stomachs contain iodine
Glucose molecules taste sweeter
Glucose molecules are small enough to fit through the gut wall
Which process do plants use to produce glucose?
Hydrolysis
Respiration
Photosynthesis
Fermentation is a chemical process that involves breaking down glucose. What two products are formed during this reaction?
Carbon dioxide and water
Carbon dioxide and alcohol
Carbon monoxide and water
The fermentation of glucose to ethanol and carbon dioxide by yeast stops when the ethanol concentration gets to about 12%. Why is this?
The ethanol has destroyed the yeast
Carbon dioxide has destroyed the yeast
There is no more glucose left to react
What is the method used to increase the ethanol concentration of fermentation products?
Cracking
Dehydration
Distillation
Which of these drinks is equivalent to two units of alcohol?
A bottle of alcopop
A half pint of lager
A measure of whisky