Molecular Biology of the Cell Chapter 011 - MODULE 001 Test
Quiz Bank With Verified Combined Q & A 2023/2024
The passage of polar molecules correct answers The hydrophobic nature of the interior of the lipid
bilayer is a barrier to what?
Different from their surrounding extracellular fluid correct answers The lipid bilayer functions to allow
cells to accumulate solutes that are what?
1. The acquisition of nutrients
2. Excretion of waste products
3. The regulation of intracellular ion concentrations correct answers Cells exchange small molecules
across its lipid bilayer for what processes? Give 3 processes
Small molecules correct answers Synthetic protein-free lipid bilayers show differences in their relative
permeability to what kind of molecules?
The faster its rate of diffusion across an artificial bilayer correct answers Smaller and more
hydrophobic/nonpolar a molecule is, what happens to the rate of diffusion across the membrane?
Concentration gradient correct answers Small molecule transport will be driven by the difference in the
solute concentration across the membrane with transport occuring down a molecules what?
Rapidly correct answers How quickly does small nonpolar molecules like oxygen and carbon dioxide cross
a membrane?
Their charge and high degree of hydration correct answers Charged molecules like sodium, potassium,
magnesium or calcium are relatively impermeable to a lipid bilayer due to what?
A flow rate correct answers The permeability coefficient and the calculated differences of a solute
concentration across an artificial membrane can be used to calculate what?
Oxygen, Carbon dioxide, Nitrogen, Steroids, Hormones correct answers Name 5 hydrophobic molecules
that can pass readily through a synthetic lipid bilayer
Water, Urea, Glycerol correct answers Name 3 small uncharged polar molecules that can pass slowly
through a synthetic lipid bilayer?
Glucose, Sucrose correct answers Name 2 large uncharged polar molecules that pass very slowly (unless
helped by transport proteins) through a synthetic lipid bilayer?
Hydrogen, Nitrogen, HCO3, Potassium, Calcium, Choride, and Magnesium correct answers Name six
charged ions that are relatively impermeable to a lipid bilayer due their charge and high degree of
hydration
Transporter correct answers What is this structure?
, Channel protein correct answers What is this structure?
Transporter correct answers Which one (channel protein or transporter) undergoes a conformational
change when transporting materials into/out of a cell?
Channel protein correct answers Which one (channel protein or transporter) is an aqueous pore?
Channel protein correct answers Which one (channel protein or transporter) moves material into/out of
the cell at a quicker rate?
Transport proteins correct answers The passage of polar molecules such as sugars, amino acids,
nucleotides, cellular metabolites and ions across a membrane requires the use of what?
A certain molecular species within that class correct answers Transport proteins each transport a specific
class of molecules and usually only what kind of molecular species?
Multispanning transmembrane proteins correct answers All known transport proteins are what?
Small hydrophilic molecules correct answers The structural composition of transmembrane proteins
allows for the transport of what kind of molecules across a hydrophobic lipid bilayer without making
direct contact?
1. Transporters/carriers/permeases
2. Channels correct answers What are the two kinds of membrane transport proteins?
Transporters correct answers What kind of membrane transport protein binds to the solute being
transported and undergo changes in conformation to transfer the molecule across the membrane?
Channel proteins correct answers What kind of membrane transport protein only weakly interact with
the transported molecule and essential act as an aqueous pore for transport
Membrane transporter correct answers Solute transport is therefore faster through a channel than
through a what?
Simple diffusion correct answers Identify A: What kind of transport is this? It is a small hydrophobic
molecule that can pass readily through the lipid bilayer.
Channel mediated; Passive transport correct answers Identify B and X : What kind of transport is this? Is
it channel mediated or transporter mediated? Is it passive transport or active transport?
Transporter mediated; Passive transport correct answers Identify C and X: What kind of transport is this?
Is it channel mediated or transporter mediated? Is it passive transport or active transport?
Active transport correct answers Identify Y: What kind of transport is this? Is it active or passive
transport?
Active transport correct answers What kind of transport uses only transporters and requires energy
input?
Quiz Bank With Verified Combined Q & A 2023/2024
The passage of polar molecules correct answers The hydrophobic nature of the interior of the lipid
bilayer is a barrier to what?
Different from their surrounding extracellular fluid correct answers The lipid bilayer functions to allow
cells to accumulate solutes that are what?
1. The acquisition of nutrients
2. Excretion of waste products
3. The regulation of intracellular ion concentrations correct answers Cells exchange small molecules
across its lipid bilayer for what processes? Give 3 processes
Small molecules correct answers Synthetic protein-free lipid bilayers show differences in their relative
permeability to what kind of molecules?
The faster its rate of diffusion across an artificial bilayer correct answers Smaller and more
hydrophobic/nonpolar a molecule is, what happens to the rate of diffusion across the membrane?
Concentration gradient correct answers Small molecule transport will be driven by the difference in the
solute concentration across the membrane with transport occuring down a molecules what?
Rapidly correct answers How quickly does small nonpolar molecules like oxygen and carbon dioxide cross
a membrane?
Their charge and high degree of hydration correct answers Charged molecules like sodium, potassium,
magnesium or calcium are relatively impermeable to a lipid bilayer due to what?
A flow rate correct answers The permeability coefficient and the calculated differences of a solute
concentration across an artificial membrane can be used to calculate what?
Oxygen, Carbon dioxide, Nitrogen, Steroids, Hormones correct answers Name 5 hydrophobic molecules
that can pass readily through a synthetic lipid bilayer
Water, Urea, Glycerol correct answers Name 3 small uncharged polar molecules that can pass slowly
through a synthetic lipid bilayer?
Glucose, Sucrose correct answers Name 2 large uncharged polar molecules that pass very slowly (unless
helped by transport proteins) through a synthetic lipid bilayer?
Hydrogen, Nitrogen, HCO3, Potassium, Calcium, Choride, and Magnesium correct answers Name six
charged ions that are relatively impermeable to a lipid bilayer due their charge and high degree of
hydration
Transporter correct answers What is this structure?
, Channel protein correct answers What is this structure?
Transporter correct answers Which one (channel protein or transporter) undergoes a conformational
change when transporting materials into/out of a cell?
Channel protein correct answers Which one (channel protein or transporter) is an aqueous pore?
Channel protein correct answers Which one (channel protein or transporter) moves material into/out of
the cell at a quicker rate?
Transport proteins correct answers The passage of polar molecules such as sugars, amino acids,
nucleotides, cellular metabolites and ions across a membrane requires the use of what?
A certain molecular species within that class correct answers Transport proteins each transport a specific
class of molecules and usually only what kind of molecular species?
Multispanning transmembrane proteins correct answers All known transport proteins are what?
Small hydrophilic molecules correct answers The structural composition of transmembrane proteins
allows for the transport of what kind of molecules across a hydrophobic lipid bilayer without making
direct contact?
1. Transporters/carriers/permeases
2. Channels correct answers What are the two kinds of membrane transport proteins?
Transporters correct answers What kind of membrane transport protein binds to the solute being
transported and undergo changes in conformation to transfer the molecule across the membrane?
Channel proteins correct answers What kind of membrane transport protein only weakly interact with
the transported molecule and essential act as an aqueous pore for transport
Membrane transporter correct answers Solute transport is therefore faster through a channel than
through a what?
Simple diffusion correct answers Identify A: What kind of transport is this? It is a small hydrophobic
molecule that can pass readily through the lipid bilayer.
Channel mediated; Passive transport correct answers Identify B and X : What kind of transport is this? Is
it channel mediated or transporter mediated? Is it passive transport or active transport?
Transporter mediated; Passive transport correct answers Identify C and X: What kind of transport is this?
Is it channel mediated or transporter mediated? Is it passive transport or active transport?
Active transport correct answers Identify Y: What kind of transport is this? Is it active or passive
transport?
Active transport correct answers What kind of transport uses only transporters and requires energy
input?
