Which of the following is a valid conclusion about sucrose a

Which of the following is a valid conclusion about sucrose as a substrate in yeast respiration?

A.Some people must have contaminated their samples with inhibitors.

Yeast is unable to use sucrose as a substrate because it lacks the enzyme sucrase.

Carbon dioxide production was higher in yeast using sucrose as a substrate than in yeast using glucose as a substrate.

Yeast is able to use sucrose as a substrate.

Solution

both C and D are correct.

Yeast uses sucrose as a substrate. sucrose = glucose + fructose. sucrase splits sucrose into glucose and fructose. isomerase converts fructose into glucose. therefore, each sucrose molecule is converted to two molecules of glucose. this is the reason why carbon dioxide production was higher in yeast using sucrose as a substrate than that of glucose as a substrate.