[Campbell Biology P.627] Considering the E. coli evolution experiment Figure 27.10 , which o... | Practice Question

Considering the E. coli evolution experiment Figure 27.10 , which of the following is the most likely function of genes whose sequence or expression was altered as the experimental populations evolved in the low-glucose environment?

  • A: Enhancing the efficiency of glucose uptake and metabolism.
  • B: Increasing resistance to antibiotics present in the growth medium.
  • C: Decreasing the rate of binary fission to conserve energy.
  • D: Altering the cell wall structure to prevent water loss.

Explanation

The experiment's primary environmental challenge was a 'low-glucose environment.' For E. coli to increase its population growth rate and adapt to this challenging environment, it would most likely evolve mechanisms to more efficiently acquire and metabolize the limited glucose available, or potentially utilize alternative energy sources. Therefore, genes related to glucose uptake and metabolism would be key targets for beneficial mutations.