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?
D
3) Which component is cholesterol?
D
4) Which component is a protein fiber of the extracellular matrix?
A
5) Which component is a microfilament (actin filament) of the cytoskeleton?
C
6) Which component is a glycolipid?
B
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?
CO2
9) Which of the following allows water to move much faster across cell membranes?
aquaporins
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.