Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 5, Problem 12RQ
Active transport must function continuously because.
- plasma membranes wear out
- not all membranes are amphiphilic
- facilitated transport opposes active transport
- diffusion is constantly moving solutes in opposite directions
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Students have asked these similar questions
Which of the following is true regarding bulk transport?
ATP is required to pump molecules against the concentration gradient
Bulk transport is an example of passive transport
Transport of large quantities of materials
ATP changes the shape of a protein channel during active transport
Which of the following would be most likely to move across the membrane
without a transport protein?
Water, because it is small and polar
O2 (molecular oxygen), because it is small and nonpolar
A cation, because it is small and positively charged
An anion because it is small and negatively charged
Passive transport across the membrane mediated by a carrier—
would not be saturated by increasing amount of substance to be transported.
does not require energy (ATP).
can be driven in reverse.
moves the solute through the membrane in the “uphill” direction of their concentration gradient.
is faster than transport mediated by channel proteins.
Chapter 5 Solutions
Biology 2e
Ch. 5 - Figure 5.12 A doctor injects a patient with what...Ch. 5 - Figure 5.16 Injecting a potassium solution into a...Ch. 5 - Figure 5.19 If the pH outside the cell decreases,...Ch. 5 - Which plasma membrane component can be either...Ch. 5 - Which characteristic of a phospholipid contributes...Ch. 5 - What is the primary function of carbohydrates...Ch. 5 - A scientist compares the plasma membrane...Ch. 5 - Water moves via osmosis. throughout the cytoplasm...Ch. 5 - The principal force driving movement in diffusion...Ch. 5 - What problem is faced by organisms that live in...
Ch. 5 - In which situation would passive transport not use...Ch. 5 - Active transport must function continuously...Ch. 5 - How does the sodium-potassium pump make the...Ch. 5 - What is the combination of an electrical gradient...Ch. 5 - What happens to the membrane of a vesicle after...Ch. 5 - Which transport mechanism can bring whole cells...Ch. 5 - In what important way does receptor-mediated...Ch. 5 - Many viruses enter host cells through receptor-...Ch. 5 - Which of the following organelles relies on...Ch. 5 - Imagine a cell can perform exocytosis, but only...Ch. 5 - Why is it advantageous for the cell membrane to be...Ch. 5 - Why do phospholipids rend to spontaneously orient...Ch. 5 - How can a cell use an extracellular peripheral...Ch. 5 - Discuss why the following affect the rate of...Ch. 5 - Why does water move through a membrane?Ch. 5 - Both of the regular intravenous solutions...Ch. 5 - Describe two ways that decreasing temperature...Ch. 5 - A cell develops a mutation in its potassium...Ch. 5 - Where does the cell get energy for active...Ch. 5 - How does the sodium-potassium pump contribute to...Ch. 5 - Glucose from digested food enters intestinal...Ch. 5 - The sodium/calcium exchanger (NCX) transports...Ch. 5 - Why is it important that there are different types...Ch. 5 - Why do ions have a difficult time getting through...
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- Which of the following methods of transport is being used to transfer the substance into the cell in the accompanying graph? a. diffusion down a concentration gradient b. osmosis c. facilitated diffusion d. active transport e. vesicular transport f. It is impossible to tell with the information provided.arrow_forwardActive transport must function continuously because_______. a. plasma membranes wear out b. cells must be in constant motion c. facilitated transport opposes active transport d. diffusion is constantly moving the solutes in the other directionarrow_forwardThe passive movement of a solute through a membrane protein down its concentration gradient is an example of _________. a. osmosis b. active transport c. endocytosis d. diffusionarrow_forward
- A transport protein requires ATP to pump sodium ions across a membrane. This is a case of ______. a. passive transport b. active transport c. facilitated diffusion d. a and carrow_forwardActive transport across membrane can be mediated by the following mechanisms: “Uphill” transport is powered by energy from photons. A solute is driven “uphill” compensated by a different solute being transported “downhill.” “Uphill” transport is powered by ATP hydrolysis. All of the above. None of the above.arrow_forwardWhich feature is typical of primary active transport? The transport protein must cross to the correct side of the membrane before the solute can bind to it. The transport protein is irreversibly phosphorylated as transport takes place. The transport protein catalyzes the conversion of ADP to ATP. The solute moves against the concentration gradient. A concentration gradient provides the energy to move substances against their concentration gradientarrow_forward
- Which of the following statements about active processes of membrane transport is true? cellular energy is required substances move against its concentration gradient all requires the aid of proteins during transport a and b a, b, and carrow_forwardWhich of the following characteristics may be used to describe Active Transport? Select all that apply. occurs without a transporter protein requires an energy source shows saturation kinetics (has a maximum rate) can occur against a concentration gradient (i.e. uphill)arrow_forwardWhich of the following are features of facilitated diffusion? There may be more than one correct answer, select all that apply. Requires energy Movement assisted by proteins Can include passive diffusion Depends on ATP hydrolysis Can include ion transport down its concentration gradient in a cell (high to low concentration)arrow_forward
- If the boundary layer around a cell is thick, diffusion rate will ... be faster than a thinner boundary layer slow down transcellular transport open more ion channels. alter active transport.arrow_forwardHow is osmosis different from simple diffusion? osmosis involves the movement of water, simple diffusion involves the movement of solutes simple diffusion utilizes energy in the form of a solute concentration gradient, osmosis utilizes energy in the form of ATP Osimple diffusion moves solutes with their concentration gradient, osmosis moves solutes against their concentration gradient osmosis is a form of active transport, simple diffusion is a form of passive transport Det betalen տներն ոգուarrow_forwardWhich of the following membrane transport mechanisms requires expenditure of metabolic energy? active transport of water facilitated transport of valine coordinated transport of Na+ and K+ against concentration gradient. diffusion of steroidsarrow_forward
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