Question

researchers analyzed the composition of cell membranes of bacteria living in different environments. thermophiles are bacteria that live at extremely high temperatures, typically at or above 70°c. which of the following best predicts the effect of a greater proportion of saturated fatty acids, as compared with unsaturated fatty acids, on the stability of the cell membrane in thermophiles? a a greater proportion of saturated fatty acids has no effect on cell membrane stability because both saturated and unsaturated fatty acids are hydrophobic. b a greater proportion of saturated fatty acids leads to increased membrane stability at lower temperatures because saturated fatty acids increase the stability of the membrane. c a greater proportion of saturated fatty acids leads to decreased membrane stability because saturated fatty acids decrease the fluidity of the membrane. d a greater proportion of saturated fatty acids leads to increased membrane stability at higher temperatures because saturated fatty acids pack tightly together.

Explanation:

Saturated fatty acids pack tightly, which helps maintain membrane stability at high temps like those thermophiles live in.

Answer:

D. A greater proportion of saturated fatty acids leads to increased membrane stability at higher temperatures because saturated fatty acids pack tightly together.