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Anatomy & Physiology

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Set 4 Movement Of Solutes And Water Across Cell Membranes

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Question 1

(Multiple Choice)

Free
At a very low temperature known as absolute zero,there is no random molecular motion.At absolute zero,would diffusion occur?

A)No,because diffusion depends upon the random motion of molecules.
B)Yes,because diffusion rates are temperature-independent.
C)Yes,as long as concentration gradients still exist.
D)Yes,because diffusion can use energy in the form of ATP.
E)Yes,as long as integral membrane proteins are still intact.

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Question 2

(Multiple Choice)

Free
You are designing a drug.You'd like to deliver the drug by creating a skin patch that is impregnated with the drug and allowing the drug to diffuse through the layers of the skin to reach the underlying tissues and bloodstream.Which of these chemical changes might you make to increase the number of drug molecules that diffuse through the layers of skin cells?

A)Increasing the number of ionized groups in the drug
B)Increasing the number of nitrogen atoms in the drug
C)Decreasing the number of nonpolar groups in the drug
D)Decreasing the number of polar groups in the drug
E)Increasing the number of oxygen atoms in the drug

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Question 3

(Multiple Choice)

Free
Which of the following statements regarding the structure and function of cell membranes is correct?

A)The phospholipid bilayer is arranged so that the hydrophilic heads of the phospholipid molecule face the extra- and intracellular fluids.
B)Some proteins integrated into the membrane serve as channels for the passage of nonpolar molecules through the membrane.
C)Peripheral membrane proteins function as channels associated with transport of ions through the membrane.
D)Cholesterol molecules function to transport ions from one side of the plasma membrane to the other.
E)The plasma membrane is a layer of phospholipid molecules with their hyrophilic head groups in contact with the extracellular solution and the hydrophobic tail groups in contact with the intracellular solution.

Answer