Reference no: EM132174969

It is about biology lab. Fermentation in Yeast with different substrates.

1. What gas was collected in the test tubes during incubation?
2. What metabolic process occurred in the test tubes to produce this gas?
3. Which energy source resulted in the highest level of gas production? Explain why this food source might be used more efficiently than others.
4. Which energy source ( not water ) resulted in the lowest level of gas production? Explain why this food source might be more difficult for yeast to metabolize. Refer to the chemical structures of these energy source molecules in your answer.
5. Which respirometer was the negative control? Explain why.
6. Which respirometer was the positive control? Explain why.
7. Can cells survive on fermentation without any aerobic cellular respiration? Explain your answer by referring to the chemical equations for these processes.

DATA

Substrate Initial gas height Final gas height net change in gas height

fructose 5mm 21mm 16mm

distilled water 7mm 8mm 1mm

sucrose 8mm 25mm 17mm

lactose 5mm 7mm 2mm

glucose 5mm 22mm 17mm