22. When a bacterium such as E. coli is shifted from a warmer growth temperature to a cooler growth temperature, it compensates by: (A) increasing its metabolic rate to generate more heat (B) synthesizing thicker membranes to insulate the cell. (C) putting longer-chain fatty acids into its membranes (D) shifting from aerobic to anaerobic metabolism (E) putting more unsaturated fatty acids into its membranes