Lab practical 3: fermentation, photosynthesis, enzymes (lab)

Question 1

equation for fermentation.

Answer 1

gluclose ->gycolysis > pyruvate -> c02+ethanol -> lactic acid

Question 2

what gas is collecting in the fermentation tube?

Answer 2

C02

Question 3

what other product should be present in solution?

Answer 3

ethanol

Question 4

did you observe a difference in the tubes?

Answer 4

ours had an air bubble (150mm) showing ours fermented.

the teacher example did not.

Question 5

which tube was the control?

Answer 5

the teacher’s example

Question 6

compare and contrast fermentation and cell respiration. which process produces more ATP per molecule of glucose?

Answer 6

fermentation cytosol: 2 ATP

absence of O2

cell resp: occurs in mitochondria

requries O2

produces 30-32 ATP

Question 7

(lab test 2)

why did the solutions color change after you exhaled into them

Answer 7

because of introducing C02

Question 8

at the end of the lab, was there any change in the color of the tubes labeled A and B?

Answer 8

yes.

tube w/plant = blue

w/out plant = green

Question 9

trace the path of the carbon dioxide after it is taken up by the elodea plant

Answer 9

C02 absorbed by theplant

Question 10

if the experiment were repeated with both tubes in the dark, what would you expect to happen?

Answer 10

nothing would happen. we need light for photosynthesis