For a substance crossing a cell membrane, the chemical driving force Select one: a. depends only...
For a substance crossing a cell membrane, the chemical driving force
Select one:
a. depends only on the concentration gradient if the substance is uncharged, but also depends on the electrical force if the substance is an ion.
b. is the force that pushes molecules across the membrane, but only if the substance is actively transported.
c. depends only on the concentration gradient, regardless of whether or not the substance is an ion
d. is the total driving force on the substance, even if it is an ion.
Passive transport of K+ through channels is an example of
Select one:
a. simple diffusion
b. facilitated diffusion
c. primary active transport
d. secondary active transport
Homework Answers
1. depends only on the concentration gradient, regardless of whether or not the substance is an ion
2. Facilitated diffusion
as it occur through the membrane channels.
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For a substance crossing a cell membrane, the chemical driving
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Select one:
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Not all words or phrases will be used. Each word or phrase
should be used only once:
membrane potential, free diffusion, hydrophilic, transporter
protein, facilitated diffusion, active transport, concentration,
hydrophobic, noncovalent, amino acid, symport, amphipathic, ion
channel, passive transport, passive, light driven.
For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once....
Please summarize this chapter
typed clearly.
Diffusion Is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across a space. Facilitated transport Facilitated diffusion is the process of spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins. Channels The integral proteins involved in facilitated transport are collectively referred to as transport proteins, and they...
WORD BANK
For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once. _ pathway th Transporter proteins and ion channels function in membrane transport by providing a _pathway through the membrane for specific polar solutes or inorganic ions. A _2__ is highly selective in the solute it transports, binding the solute at...
33) Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal? A) Sodium and glucose bind to the same site on the cotransporter. B) Transport of glucose against its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient. C) Sodium ions can be transported whether or not glucose is present outside the cell, but glucose transport requires cotransport of sodium ions. D)...
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