1. Assume you are analyzing the function of an unknown drug that you suspect alters metabolism in human cells. You add the drug in different amounts in a colony of cells and find that above a certain concentration, the rate of cell growth slows dramatically. You then find out that the effect is an indirect one. The transport of pyruvate into the mitochondria is inhibited and all other processes occur normally. What would be the result of glucose metabolism? Would this mimic fermentation? Why or why not?

2. You are growing cells in the presence of radioactive ATP (in which the third phosphate of the ATP is “hot”). You isolate all of the products of metabolism from glucose to oxaloacetate. Which species carry a radioactive phosphate?

3. If you take all the radioactive material from question 2 (sugars that carry radioactive phosphate) and feed that to some cells, on what molecule would you expect the “hot” phosphate to be found after metabolism has occurred?

4. The energy-harvesting reactions of glycolysis produce two molecules of __________, two molecules of __________, and two molecules of __________.

a. ATP, glyceraldehyde-3-phosphate, pyruvate

b. pyruvate, glyceraldehyde-3-phosphate, water

c. ATP, NADH, pyruvate

d. glucose, carbon dioxide, water

5. Baking bread typically starts with dissolve yeast in sugar (sucrose) and hot water. Soon, this yeast mixture begins to bubble and sometimes overflows the container. What is happening?

6. Glycolysis produces __________ and two molecules of ATP. Without oxygen, fermentation produces ____________. Glycolysis and the krebs cycle coupled together can convert the carbons of glucose to ___________ while storing the energy gained as ATP, ____________, and ___________.

a. Lactic acid, pyruvate, CO2, NADH, FADH2

b. Pyruvate, lactic acid, CO2, NADH, FADH2

c. CO2, NADH, FADH2, Lactic Acid, Pyruvate

d. O2, lactic acid, pyruvate, FADH2

e. Glucose, Lactic acid, CO2, NADH, FADH2