Five statements about cell membranes are given.Which statement provides evidence supporting the fluid nature of the cell membrane?
A) Some membrane proteins are anchored to other molecules inside or outside the cell, while others are not.
B) The inner and outer surfaces of a biological membrane are often quite different in terms of the molecular structures they display.
C) A phospholipid molecule can move from one end of a bacterial cell to the other in one second.
D) Cell membranes from different cells have widely different lipid and cholesterol compositions.
E) Analysis of the genes present in many eukaryotes has revealed that membrane proteins account for about 25 percent of the total number of genes.

Question

Quizplus · Accepted Answer

Statement C provides evidence supporting the fluid nature of the cell membrane by indicating that a phospholipid molecule can move rapidly within the membrane. This movement is possible because of the fluidity of the membrane, which allows for the free diffusion of lipids and other molecules. Choices A, B, D, and E do not provide evidence for the fluid nature of the cell membrane.

Five Statements About Cell Membranes Are Given