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answers study question 10 - BIS2A Answers to study...

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BIS2A Answers to study questions 10 Two species of non-photosynthetic bacteria, L and M, have similar metabolism, but for the absence of the krebs cycle and the electron transport chain in M. Using separate flasks, you introduce 1000 cells of each L and M in a growth medium containing glucose and incubate the flasks in the presence of O2 (aerobic conditions). 1. Which species will produce the most cells in one day of growth on this medium? Why? L, because it can extract more energy out of glucose. L can oxidize the sugar carbons completely to CO2 while M can only ferment glucose. 2. What might you find in the medium where M has been growing? Either lactic acid or ethanol 3. What do you expect if you repeat the experiment after removing O2 from the growth media (anaerobic conditions)? Both L and M will grow by fermentation and their growth should be comparable. A third species, P, also has similar metabolism, but lacks a key enzyme of glycolysis.
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