You are working with yeast cells, and you discover an inhibitor of one of the enzymes necessary
to convert pyruvate to ethanol. If you added this inhibitor to the yeast you are growing in an
open petri dish, what would happen?
O Adding this inhibitor would likely cause an increase ATP production from cells
O Adding this inhibitor would likely cause a decrease in the production of metabolic water
O Adding this inhibitor would likely cause an increase oxygen usage by the cell
O All substrate-level phosphorylation would stop in the yeast, though chemiosmosis would still
occur
More than one of the above is possible
O None of the above

Yeast are unicellular organisms that belong to the kingdom Fungi. Yeasts are capable of respiring anaerobically i.e. can respire without oxygen.

Yeast can, however, respire both aerobically and anaerobically. Yeast undergoes an anaerobic respiration called FERMENTATION, which is used to produce ethanol (alcohol) from pyruvate (product of glycolysis).

If a substance that inhibits the conversion of pyruvate to ethanol is added to yeast cells growing in a petri dish, the process of fermentation will be inhibited. Hence, the yeast cells will have to switch to aerobic respiration and make use of oxygen.

Therefore, adding the inhibitor to the yeast cells in the petri dish would likely cause an increase oxygen usage by the cell.

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