The following question refers to the figure.
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.

E. coli cells typically make most of their ATP by metabolizing glucose. Under the conditions of this experiment, E. coli generation times in the experimental lines and low-glucose conditions should ________.
A) be the same as in the typical environment
B) be faster than in the typical environment
C) be slower than in the typical environment
D) increase over time in the experimental cells

Question

The following question refers to the figure.
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.

E. coli cells typically make most of their ATP by metabolizing glucose. Under the conditions of this experiment, E. coli generation times in the experimental lines and low-glucose conditions should ________.
A) be the same as in the typical environment 
B) be faster than in the typical environment 
C) be slower than in the typical environment 
D) increase over time in the experimental cells

Quizplus · Accepted Answer

E. coli cells typically make most of their ATP by metabolizing glucose. With low-glucose conditions, the cells would have reduced energy supply, leading to slower generation times.

The Following Question Refers to the Figure