Question

being released. 72. The bubbles coming out from the flask containing yeast, sugar & water were the result of a glucose b. CO2 c. alcohol d. 02 73. What was the role of sugar in the fermentation exercise? a. speeded up the reactions b. final product c. was broken down to release energy d. reagent 74. The provided the necessary enzymes and ATP to produce alcohol a. sugar b. yeast c. carbon dioxide d.oxygen gas 75. Why do cells undergo fermentation? a. to synthesize sugar c. to use ATP to make alcohol b. to convert CO2 into 02 d. to release energy from sugar & use it to make ATP c. convert O2 into CO2 76. Which is expected to occur if O2 was allowed to enter the flask with yeast, sugar & water? a. less or no alcohol will be produced c. sugar will be consumed c. neither a, b nor e will occur b. yeasts will grow faster d. a, b & c will occur

Answer 1

72) b CO2

      As the yeast feeds on sugar ,it produces CO2. This gas will released to up and form bubbles in the solution.

73) a Speeded up the reaction

        Sugar affects the rate of fermentation reactions.

74) b yeast

     Yeasts are able to participate in fermentation because they have the necessary enzyme to convert pyruvic acid to ethyl alcohol. during fermentation yeast produce alcohol.

75) d to release energy from sugar and use it to make ATP

Fermentation completes glycolysis and makes it possible for ATP to be continually produced in the absence of oxygen.

76) a less or no alcohol will be produced

    fermentation normally occurs in an anaerobic environment. in the presence of O2 NADH and pyruvate are used to generate ATP in respiration. This is called oxidative phosphorylation. Because it gives more ATP than fermentation.