In This Eight-Year Experiment, 12 Populations of E

question 42

Multiple Choice

In this eight-year experiment, 12 populations of E. coli, each begun from a single cell, were grown in low-glucose conditions for 20,000 generations. Each culture was introduced to fresh growth medium every 24 hours. Occasionally, samples were removed from the populations, and their fitness in low-glucose conditions was tested against that of members sampled from the ancestral (common ancestor) E. coli population.
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Compare the bacteria in the figure above in generation 1 and generation 20,000. The bacteria in generation 1 have a greater ________.

• A) efficiency at exporting glucose from the cell to the environment
• B) ability to survive on simple sugars, other than glucose
• C) ability to synthesise glucose from amino acid precursors
• D) reliance on glycolytic enzymes

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