Understanding Cell Membrane Components and Functions

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1) Singer and Nicolson's fluid mosaic model of the membrane proposed that membranes consist of protein molecules embedded in a fluid bilayer of phospholipids

2) Which component is a peripheral protein?


3) Which component is cholesterol?


4) Which component is a protein fiber of the extracellular matrix?


5) Which component is a microfilament (actin filament) of the cytoskeleton?


6) Which component is a glycolipid?


7) Which of the following most accurately describes selective permeability?

Only certain molecules can cross a cell membrane.

8) Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?


9) Which of the following allows water to move much faster across cell membranes?


10) Diffusion is a passive process in which molecules move from a region of higher concentration to a region of lower concentration

11) Which of the following is true of osmosis?

In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration.

12) The sodium-potassium pump is called an electrogenic pump because it contributes to the membrane potential

13) The force driving simple diffusion is the concentration gradient; ATP

14) White blood cells engulf bacteria using phagocytosis

15) The difference between pinocytosis and receptor-mediated endocytosis is that pinocytosis is nonselective in the molecules it brings into the cell, whereas receptor-mediated endocytosis offers more selectivity.

16) The fluid mosaic model describes the plasma membrane as consisting of individual proteins and phospholipids that can drift in a phospholipid bilayer

17) Most of the functions of a cell membrane are performed by proteins.

18) Plasma membranes are selectively permeable. This means that the plasma membrane allows some substances to enter or leave a cell more easily than others.

19) Oxygen crosses a plasma membrane by passive transport.

20) Diffusion does not require the cell to expend ATP. Therefore, diffusion is considered a type of passive transport.

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