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Chapter 5: Q. 14 (page 153)

What is the combination of an electrical gradient and a concentration gradient called?

  1. Potential gradient
  2. Electrical potential
  3. Concentration potential
  4. Electrochemical gradient

Short Answer

Expert verified

(d) Electrochemical gradient is the correct answer because an electrochemical gradient defines as the combination of an electrical gradient and concentration gradient that affects the ions.

Step by step solution

01

Step 1. Introduction

Concentration gradient is the differential concentration of substances across a membrane whereas electrical gradient is the difference of charge across the membrane.

02

Step 2. Explanation

(d) An electrochemical gradient defines as the combination of an electrical gradient and concentration gradient that affects the ions.

(a) The Potential gradient is an incorrect answer because the potential gradient is not the combination of electrical gradient and the concentration gradient whereas the electrochemical gradient is the combination of electrical gradient and the concentration gradient.


(b) Electrical potential is an incorrect answer because electrical potential is the quantity of work that will be needed to move a unit charge from a reference point to a specific point besides an electric field whereas electrochemical gradient is the combination of electrical gradient and the concentration gradient.


(c) Concentration potential is an incorrect answer because concentration potential refers to the tendency for an electrolyte that is univalent to concentrate in a specific region of a particular solution whereas electrochemical gradient is the combination of electrical gradient and the concentration gradient.

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Most popular questions from this chapter

What problem is faced by organisms that live in fresh water?

  1. Their bodies tend to take in too much water.
  2. They have no way of controlling their tonicity.
  3. Only salt water poses problems for animals that live in it.
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A cell develops a mutation in its potassium channels that prevents the ions from leaving the cell. If the cell’s aquaporins are still active, what will happen to the cell? Be sure to describe the tonicity and osmolarity of the cell.

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Discuss why the following affect the rate of diffusion: molecular size, temperature, solution density, and the distance that must be travelled.
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