Which process best describes selective forwarding in a switch?

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Chapter 5

3) Singer and Nicolson's fluid mosaic Model of the membrane proposed that membranes_____.

C) Consist of protein molecules embedded in a fluid bilayer of phospholipids

For the following questions, match the Labeled component of the cell membrane in the figure with its description.

6) Which component is a peripheral Protein?

D) D

7) Which component is cholesterol?

C) D

8) Which component is a protein fiber Of the extracellular matrix?

A) A

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

C) C

10) Which component is a glycolipid?

B) B

11) Which of the following most Accurately describes selective permeability?

D) Only certain molecules can cross a cell membrane.

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

A) CO2

13) Which of the following allows water To move much faster across cell membranes?

D) Aquaporins

14) Diffusion _____.

C) Is a passive process in which molecules move from a region of higher concentration to a region of lower concentration

15) Which of the following is true of Osmosis?

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

17) The sodium-potassium pump is called An electrogenic pump because it _____.

B) Contributes to the membrane potential

22) The force driving simple diffusion Is _____, while the energy source for active transport is _____.

B) The concentration gradient; ATP

23) White blood cells engulf bacteria Using _____.

A) Phagocytosis

25) The difference between pinocytosis And receptor-mediated endocytosis is that _____.

C) Pinocytosis is nonselective in the molecules it brings into the cell, whereas Receptor-mediated endocytosis offers More selectivity.

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