Question

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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. Which of the following, if it occurs in the absence of any other type of adaptation listed here, is least reasonable in terms of promoting bacterial survival over evolutionary time in a low-glucose environment? * increased efficiency at transporting glucose into the cell from the environment increased ability to survive on simple sugars, other than glucose increased ability to synthesize glucose from amino acid precursors increased reliance on glycolytic enzymes P o increased sensitivity to, and ability to move toward whatever alucose is

Answer 1

E.coli generally prefers Glucose as it's carbon source, but when it is less available from its environment, then it will get adapted to new available carbon sources.
Thus, when occasionally samples were removed from the populations and when their fitness for low glucose conditions was tested against that of wild E.coli strains, it can be observed that there is an increased ability to survive on simple sugars other than glucose.
Hence second option is the correct answer.