Physiology 1 Ch-4,5

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  • Topic: Signal transduction, Protein, Receptor
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Physiology 1 ch-4,5

1.___________ is a term which describes a membrane that allows only certain molecules to penetrate it. A. Selective permeable
B. Permeable
C. Porous
D. Counter transport

2.Active Transport
A. Utilizes energy
B. Cannot transport molecules against a concentration gradient. C. Cannot be saturated
D. Requires cofactors

3.The Rate of diffusion is influenced by
A. The concentration gradient
B. Membrane permeability
C. Membrane surface area
D. All of the choices are correct

4. Cells placed in hypotonic solutions will
A.Decrease in volume
B.Increase intracellular solute concentration
C.Increase in volume
D.Loose water to the solution

5. Protein carrier mediated transport of molecules display
A. Specificity
B. Competition
C. Saturation
D. All the choices are correct

6. Facilitated diffusion is unable to transport molecules against a concentration gradient. True False

7. The Na+/K+ pump transports ______ into the cell and ____ out of the cell per cycle. A. 3Na+, 2K+
B. 2Na+, 3K+
C. 3K+, 2 Na +
D.2K+, 3 Na +

8. The Na+/K+ pump
A.Is an example of primary active transport
B.Generates a positive membrane potential
C.Actively transports 2 potassium ions out of the cell
D.Actively transports 3 sodium ions into the cell

9. Secondary active transport often occurs as a coupled transport process. True False

10. Poisoning the Na+/K+ pump would cause the volume of the cell to_______ A. Increase
B. Decrease
C. Remain the same

11.Secondary active transport
A.Utilizes energy directly
B.Often utilizes symport proteins
C.Always uses the influx of sodium ions
D.Is only important in the kidney.

12. What molecules pass information from the polar regulatory molecules receptor to activate the enzymes that produce cAMP? A.Paracrines
B.G-proteins
C.GTP

13. Which form of membrane transport is being described? The passage of molecules into cells with out passing through the plasma membranes structural matrix. A.Diffusion
B.Osmosis
C.Facilitated diffusion
D.Endocytosis
E.Apoptosis

14. “Osmosis” refers to the movement of _______ across semipermeable membranes. A.Glucose
B.Charged particles
C.Lipid molecules
D.Water
E.Any substance

15. If all other conditions remain the same and the concentration of a nonpenetrating solute increases inside a cell. A.Water will tend to enter the cell because the interior has an increases osmolarity B.Water will tend to leave cell because the interior has an increases osmolarity C.Water will tend to enter the cell because the interior has an decreased osmolarity D.Water will tend to leave cell because the interior has an decreased osmolarity E.The nonpenetrating solute will diffuse across the membrane until its concentration is equal on both sides of the membrane.

16.If a cell is placed in a hypotonic solution, it
A.Will swell
B.Will shrink
C.Will stay the same size
D.May swell, shrink or stay the same size, depending upon the concentration of penetrating and nonpenetrating solutes in the solution

17. If a cell is placed in a hyperosmotic solution, it
A. Will swell
B. Will shrink
C. Will stay the same size
D.May swell, shrink or stay the same size, depending upon the concentration of penetrating and nonpenetrating solutes in the solution

18. Which of the following statements regarding Endocytosis and Exocytosis is correct? A.Endocytosis is a method by which large molecules may be brought into a cell B.Exocytosis is a method by which large molecules may be secreted from cell C.Pinocytosis is a form of Endocytosis; phagocytosis is a form of Exocytosis D.Both Endocytosis is a method by which large molecules may be brought into cell and Exocytosis is a method by which large molecules may be secreted from a cell are correct.

19. Receptor mediated Endocytosis requires
A.A specific ligand and functional receptors for it on the external plasma membrane B.The...
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