What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 4, Problem 5MC
Summary Introduction
Introduction:
Movement of molecules from a region of high concentration to a region of low concentration does not require energy.
Correct answer:
Option (c): passive transport.
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Describe and explain the difference between:
a. Active and passive transport across a membrane. Give an example (can be broad) of a molecule that crosses a membrane for each mechanism.
b. Primary vs secondary active transport. Give an example of a molecule(s) that crosses a membrane for each mechanism.
Below are three statements - two of which are truths and one is a lie. Which of the following statements is a lie?
Select one:
a.The primary active transport uses external chemical energy.
b.The sodium-potassium pump which is an example of primary active transport is considered as the most important pump.
c. In primary active transport, the energy is derived secondarily from energy that has been stored in the form of ionic concentration differences between the two sides of a membrane.
The process of “active transport" through a membrane may be described by
which of the following?
A. the movement of ions and small molecules away from regions where they
are in high concentration.
B. the use of energy from ATP to move ions and small molecules into regions
where they are in lower concentration.
C. the plasma membrane engulfs the substance and moves it through the
membrane.
D. the use of energy from ATP to move ions and small molecules against their
concentration gradient.
Chapter 4 Solutions
What Is Life? A Guide to Biology with Physiology
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- For the following modes of transport for membranes, tell whether the flow is with or against chemical potenial. Meaning +deltaG or -deltag A. Passive Diffusion B.Faciliated Diffusion C.Active Transportarrow_forwardActive transport is different from passive transport because a. no additional energy is required. b. molecules move from low concentration to high concentration. c. ions are involved. d. proteins are involved. e. water is moved across the membrane.arrow_forwardBelow are three statements - two of which are truths and one is a lie. Which of the following statements is a lie? Select one: a. Both primary and secondary transport moves solutes against their concentration gradients. b. The primary active transport prepares the conditions of the membrane gradient by making the extracellular membrane slightly more negative than the intracellular membrane. c. The primary active transport uses ATP while secondary active transport helps replenish ATP.arrow_forward
- Would it be possible for small ions to passively diffuse (simple diffusion) across a selectively permeable membrane? Why? A Yes, because ions are highly non-polar in nature B Yes, because ions are highly polar in nature No, because it needs the aid of transport proteins to cross the membrane No, because not only transport proteins but also metabolic energy from ATP are needed to transport ions across the plasma membranearrow_forwardCells transport sodium ions out of the cell against the sodium concentration gradient. This is an example of: a. facilitated diffusion b. simple diffusion c. diffusion via channel proteins d. endocytosis e. active transportarrow_forwardWhich of the following is incorrect regarding facilitated diffusion?a. It is a passive process.b. It allows the movement of molecules from areas of lowconcentration to areas of high concentration.c. It may use either channel or carrier proteins.d. It allows the rapid transport of glucose across the membrane.arrow_forward
- Which of the following statements is/are true about transport proteins?I. They carry out biochemical functions that remove nutrients in a cell.II. They are proteins which have high specificity to a single kind of molecule.III. They function to accumulate solutes against the concentration gradient.IV. They are highly regulated in a cell.arrow_forwardWhich of the following statements about active processes of membrane transport is true? a. cellular energy is required b. substances move against its concentration gradient c. all requires the aid of proteins during transport d. a and b e. a, b, and carrow_forwardwhich of the following statements is correct about the movement of water across a plasma membrane a. it cannot pass through any ion channels b. it moves through the membrane via mediated transport c. even though it a polar molecule, it moves readily through the nonpolar lipid bilayer d. artificial lipid membranes are impermeable to waterarrow_forward
- secondary active transport depends on which of the following principles? a. sodium is pumped out of the cell against a concentration gradient by primary active transport b. sodium moves out of the cell with a concentration gradient c. primary active transport is necessary to pump sodium into the cell from a higher to lower concentration d. diffusion causes sodium to move out of the cellarrow_forwardone reason active transport has a limited maximum transport rate at which it can progress is due to the fact that a. energy required is not available inside the cell b. carrier proteins are not on the surface of the cell membrane c. ion channels are limited in size d. the number of carrier proteins is limited and therefore they can become saturatedarrow_forwardActive transport must function continuously because a.facilitated transport opposes active transport b.not all membranes are amphiphilic c.diffusion is constantly moving solutes in opposite directions d.the cell needs ions outside the cell e.plasma membrane wear outarrow_forward
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