Respiration and Fermentation Name 1 Cellular respiration and

Respiration and Fermentation Name: 1. Cellular respiration and fermentation transfer the energy from glucose bonds into another important energy molecule called which is used by the cells to do work. 2. Does fermentation occur inside the mitochondria outside them? or of 3. What produces more energy, fermentation, or cellular respiration? 4. In the fermentation experiment last week, how could you tell if yeast was fermenting the glucose? a) It tested positive for the presence of starch b) CO2 gas was produced c) The DPIP became more transparent d) The glucose gained electrons 5. Does DPIP loses its blue color when a) It gets oxidized. b) It is broken down by the mitochondria. c) It accepts the electrons and gets reduced d) When it is broken down by yeast. 6. What instrument was used to measure light transmittance? a) a spectrometer b) a spectrophotometer c) a transpirometer d) a respirometer 7. You are measuring respiration in two cuvettes. In the cuvette A, the Transmittance is 17%; in cuvette B the Transmittance is 25%. If both started at 15%, in which cuvette did the most respiration occur?

Solution

1. Cellular respiration and Fermentation converts Glucose to an energy molecule , which is known as ATP (Adenosine Triphosphate). This is a catabolic reaction where glucose bonds are broken to form ATP.

2. Generally, fermentation occurs in the cytoplasm of the cells in eukaryotic cells. Thus, fermentation occurs outside of the mitochondria.

3. In fermentation only 2 ATP are formed, whereas in Cellular respiration 36 ATP are formed. This indicates in cellular respiration 34 more ATP are formed. Thus cellular respiration produces more energy.

4. (b) CO2 gas was produced. In fermentation process, the gluocse molecule is fermented to give ethanol and carbon dioxide.

5. DPIP is electron acceptor, and thus gets reduced while accepting the elctrons and then it becomes blue in color. (c) is the correct answer.

6. Light transmittance is measured by (b) spectrophotometer.

7. More transmittance indicates more respiration. Therefore, cuvette B has more respiration to occur.

8. (b) The statement is false because respiration occurs in cytosol and mitochondria. Glycolysis occurs in cytosol and ETC and Citric acid cycle occurs in mitochondria.