Date fruits contain three different sugars, fructose, glucose and sucrose.
Different strains of yeast can ferment different sugars to produce a fermented product.
Scientists investigate how two different strains of yeast, A and B, ferment sugars inside date fruits.
Look at their results.
(i)
Which sugar is
not fermented by either strain of yeast?
Tick (✓)
one box.
[1]
(ii)
After 24 hours, how many times higher is the fermented product yield of yeast A compared to yeast B?
Number of times higher = .................................................. [2]
(iii)
Which sugar would increase fermentation the most if added to either yeast
A or yeast
B?
Tick (✓)
one box.
[1]
(iv)
Fermented dates are used to supply both fructose and fermented product.
Explain why it would be best to use yeast B to ferment dates to supply both fructose and fermented product.
[2]