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Chapter 4: Problem 13

What do active transporters and carriers have in common? a) They both transport molecules up electrochemical gradients. b) They both transport molecules down electrochemical gradients. c) They both transport lipid-soluble substances preferentially. d) They both utilize ATP to transport molecules. e) They both are specific for certain molecules.

Short Answer

Expert verified
e) They both are specific for certain molecules.

Step by step solution

01

Understand Key Terms

Active transporters are proteins that move molecules across the cell membrane against their concentration gradient and typically use energy directly from ATP. Carriers, or facilitated diffusion proteins, help move substances down their concentration gradient without using cellular energy.
02

Analyze Each Option

a) Active transporters transport molecules against the gradient, while carriers transport down the gradient. b) Carriers do this, but active transporters typically do not. c) Neither is specifically for lipid-soluble substances; they transport specific molecules. d) Only active transporters commonly utilize ATP. e) Both active transporters and carriers are specific to certain molecules due to their binding sites.
03

Eliminate Incorrect Options

Based on Step 2's analysis, eliminate options a, b, c, and d because these statements describe specific features of only one of the two (either active transporters or carriers).
04

Confirm and Select Correct Option

The correct statement is e) because both active transporters and carriers bind specifically to certain molecules they transport, ensuring selectivity.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Active Transport
Active transport is a fascinating mechanism used by cells to move molecules across their membranes against their concentration gradient. This requires energy, which is commonly supplied by the molecule ATP (adenosine triphosphate). Think of active transport like pushing a boulder up a hill. Just as you would need energy to push the boulder uphill, cells need energy from ATP to move substances from an area of low concentration to an area of high concentration.

Some key points about active transport include:
  • It allows cells to maintain concentration differences that are crucial for physiological functions.
  • Cells use special proteins known as transporters or pumps to carry out active transport.
  • An important example is the sodium-potassium pump, which moves sodium ions out of and potassium ions into cells, crucial for nerve function.
In summary, this process is essential for numerous cellular activities and ensures that cells can uptake essential nutrients regardless of external concentrations.
Facilitated Diffusion
Facilitated diffusion is another method of transporting molecules across cell membranes, but unlike active transport, it doesn't require energy. This process helps move substances down their concentration gradients, meaning they move from areas of high concentration to low concentration, much like rolling a ball downhill.

Key aspects of facilitated diffusion include:
  • It involves carrier proteins or channel proteins that are specific to the substances they transport.
  • This process allows ions, glucose, and other essential molecules to cross the cell membrane efficiently.
  • Since no energy is required, facilitated diffusion is a passive form of transport.
In essence, facilitated diffusion plays a critical role in maintaining cellular homeostasis by allowing necessary molecules to pass through the cell membrane without using up cellular energy.
Electrochemical Gradient
An electrochemical gradient refers to a combination of two gradients across a cell membrane: a chemical gradient (concentration difference) and an electrical gradient (difference in charge). These gradients are essential for several cellular processes, particularly the conduction of nerve impulses.

Some important points about electrochemical gradients are:
  • They are established by the movement of ions across the cell membrane.
  • The sodium-potassium pump is a prime example of a protein that establishes and maintains electrochemical gradients.
  • These gradients drive various transport processes, including both active transport and facilitated diffusion.
Conclusively, understanding electrochemical gradients is crucial to grasp how cells communicate and function, as these gradients play a pivotal role in the viability and functionality of cells.

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Most popular questions from this chapter

Given that the potassium equilibrium potential is \(-94 \mathrm{mV}\) and the sodium equilibrium potential is \(+60 \mathrm{mV}\), which of the following statements is true for forces acting on sodium and potassium when a cell is at \(-70 \mathrm{mV}\) ? a) The electrochemical gradient for \(\mathrm{Na}^{+}\) tries to move it into the cell b) The electrochemical gradient for \(\mathrm{K}^{+}\) tries to move it into the cell c) Both a and b are correct. d) Neither a nor b is correct.

One example of primary active transport is the a) Transport of \(\mathrm{Ca}^{2+}\) up an electrochemical gradient by a protein that hydrolyzes ATP. b) Transport of \(\mathrm{Ca}^{2+}\) up an electrochemical gradient by a protein that couples \(\mathrm{Ca}^{2+}\) flow to the flow of \(\mathrm{Na}^{+}\)down an electrochemical gradient. c) Movement of \(\mathrm{Ca}^{2+}\) down an electrochemical gradient through channels. d) Transport of glucose molecules down a concentration gradient by carriers. e) Transport of glucose up a concentration gradient by a protein that couples glucose flow to the flow of \(\mathrm{Na}^{+}\)down an electrochemical gradient.

Oubain is a drug that blocks the \(\mathrm{Na}^{+} / \mathrm{K}^{+}\) pump. Describe and explain the effects you would expect oubain to have on (1) sodium concentration gradients across cell membranes, (2) potassium concentration gradients across cell membranes, and (3) movement of molecules by secondary active transport coupled with sodium.

The osmotic pressure of a solution depends on a) The concentrations of all solute particles contained in it. b) The concentrations of all permeant solute particles contained in it. c) The concentrations of all impermeant solute particles contained in it. d) The pressure exerted on the solution by the atmosphere. e) The volume of water in which the solute particles are dissolved.

Substances that cross cell membranes by simple diffusion are mostly (hydrophilic/ hydrophobic).
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