iWriteGigs

Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

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Manush’s story shows the importance of using powerful keywords to his resume in landing the job he wanted.

L14 Membranes

Navigation   » List of Schools  »  West Los Angeles College  »  Chemistry  »  Chem 221 – Biochemistry for Science Majors  »  Fall 2021  »  L14 Membranes

Need help with your exam preparation?

Below are the questions for the exam with the choices of answers:

Question #1
A  Proteins
B  hydrophilic heads
C  Carbohydrates
D  lipids
Question #2
A  a bilayer made of lipids with polyunsaturated 16 carbon-fatty acids
B  a bilayer made of lipids with polyunsaturated 18 carbon-fatty acids
C  a bilayer made of lipids with saturated 16 carbon-fatty acids
D  a bilayer made of lipids with saturated 18 carbon-fatty acids
E  All of the above are equivalent in fluidity.
Question #3
A  water moves out of the slug, causing dehydration
B  water moves into the slug, causing it to swell
C  salt moves out of the slug, depriving it of essential minerals
D  salt moves into the slug, poisoning it
Question #4
A  Osmosis
B  Diffusion
C  Concentration gradient
D  Semi-permeable
Question #5
A  Homeostasis
B  Hypotonic
C  Hypertonic
D  Isotonic
Question #6
A  Solution
B  Osmosis
C  Isotonic
D  Diffusion
Question #7
A  shrink
B  swell
C  stay the same size
D  impossible to tell
Question #8
A  pinocytosis.
B  osmotic pressure.
C  osmosis.
D  active transport.
Question #9
A  move across the membrane to the inside of the cell.
B  stop moving across the membrane.
C  continue to move across the membrane in both directions.
D  move across the membrane to the outside of the cell.
Question #11
A  primary active transport
B  passive diffusion through the lipid bilayer
C  secondary active transport
D  specific gas transport proteins
Question #12
A  cholesterol at certain temperatures
B  poor alignment of the fatty acids tails
C  double bonds between carbon atoms in the fatty acid tails
D  steroid lipids at certain temperatures
E  all of the above
Question #13
A  Small polar molecules require specific transport systems for passage across a membrane.
B  Small polar molecules cannot be transported through a cell membrane against a concentration gradient.
C  Small polar molecules can diffuse through a cell membrane along a concentration gradient.
D  Small inorganic ions can diffuse through a cell membrane along a concentration gradient.
Question #14
A  Cell membranes maintain the shape of cells.
B  Cell membranes retain the contents of cells.
C  Cell membranes are impermeable to most molecules.
D  Cell membranes are permeable to most inorganic ions.
Question #15
A  Integral membrane proteins are anchored to the lipid bilayer by ionic bonds.
B  Transmembrane porins have hydrophilic amino acids that point inwards in the beta-barrels.
C  Integral membrane proteins have transmembrane domains rich in hydrophobic amino acids.
D  Integral membrane proteins have ends rich in hydrophilic amino acids.
Question #16
A  Membrane fluidity is decreased when there is a high proportion of cis unsaturated fatty acids in the glycerophosphate molecules that make up the bilayer.
B  Membrane fluidity is increased when there is a high proportion of cis unsaturated fatty acids in the glycerophosphate molecules that make up the bilayer.
C  Membrane fluidity is increased when there is a high proportion of saturated fatty acids in the glycerophosphate molecules that make up the bilayer.
D  Membrane fluidity is increased when there is a high proportion of trans unsaturated fatty acids in the glycerophosphate molecules that make up the bilayer.
Question #17
A  Transverse movement of membrane lipids within the bilayer is unrestricted.
B  The inner and outer halves of the lipid bilayer are identical.
C  Lateral movement of membrane lipids is catalysed by special proteins.
D  Lateral movement of membrane lipids occurs rapidly within the plane of the bilayer.
Question #18
A  proteins
B  cholesterol
C  None of the answers is correct.
D  magnesium ions
E  ATP
Question #19
A  membrane melting temperatures.
B  membrane fluidity
C  All of the answers are correct.
D  membrane fluidity and membrane melting temperatures.
E  membrane asymmetry
Question #20
A  Diffusion through a uniport
B  facilitated diffusion
C  Active transport
D  Passage through ion channels
Question #21
A  glycolipids
B  unsaturated fatty acids.
C  lipids that contain sphingosine.
D  free fatty acids.
Question #22
A  positioned on the extracellular side of the membrane.
B  positioned on the inside center of the bilayer.
C  positioned equally on both sides of the membrane.
D  also covalently attached to membrane proteins
E  positioned on the intracellular side of the membrane.
Question #23
A  a bilayer made of lipids with saturated 18 carbon-fatty acids
B  a bilayer made of lipids with saturated 16 carbon-fatty acids
C  a bilayer made of lipids with polyunsaturated 18 carbon-fatty acids
D  a bilayer made of lipids with polyunsaturated 16 carbon-fatty acids
E  All of the above are equivalent in fluidity.
Question #24
A  two
B  one
C  varying thickness, depending on structure
D  None of the answers is correct.
E  infinite
Question #25
A  None of the answers is correct.
B  lipids and proteins
C  All of the answers are correct
D  carbohydrates
Question #26
A  integral membrane proteins in contact with the cytoplasm
B  glycolipids
C  lipid-linked proteins
D  cholesterol
Question #27
A  kinesin-mediated movement
B  translocation
C  lateral diffusion
D  flip-flopping
E  asymmetric longitudinal flipping
Question #28
A  None of the answers is correct.
B  asymmetry
C  amphipathic nature
D  bilayer
E  selective permeability
Question #29
A  Passage through a channel allows polar and charged compounds to avoid the hydrophobic core of the plasma membrane, which would otherwise block their entry into the cell.
B  Movement of one molecule down its gradient is an entropically driven process
C  The transport of a molecule up its gradient is an exergonic process
D  The transport of a molecule up its gradient is an energy-requiring process.
Question #30
A  Energy
B  Water
C  Carrier proteins
D  Concentrated solutes
Question #31
A  An area of high concentration to an area of low concentration
B  An area of equilibrium to an area of high concentration
C  An area of low concentration to an area of high concentration
D  All of the above
Question #33
A  diffusion
B  facilitated diffusion
C  active transport
D  None of the choices are correct
E  osmosis
Question #34
A  The outside surface of a beta barrel is hydrophylic
B  There are electrostatic and hydrogen-bonding attractions between the polar head groups and water molecules.
C  In accord with the Second Law of Thermodynamics, molecules spontaneously move from a region of higher concentration to one of lower concentration
D  An entropy increase powers diffusion across the membrane.
Question #35
A  passive transport
B  primary active transport
C  simple diffusion
D  secondary active transport
E  facilitated diffusion
Question #36
A  generally irreversible
B  driven by ATP
C  not specific with respect to the substrate
D  driven by a difference of solute concentration
E  endergonic
Question #37
A  synthesizing thicker membranes to insulate the cell.
B  increasing its metabolic rate to generate more heat.
C  putting longer-chain fatty acids into its membranes.
D  shifting from aerobic to anaerobic metabolism.
E  putting more unsaturated fatty acids into its membranes.
Question #38
A  an increase in fatty acyl chain length.
B  a decrease in temperature.
C  an increase in the number of double bonds in fatty acids.
D  the binding of water to the fatty acyl side chains.
Question #39
A  Individual lipid molecules are free to diffuse laterally in the surface of the bilayer.
B  Individual lipid molecules in one face (monolayer) of the bilayer readily diffuse (flip-flop) to the other monolayer.
C  Polar, but uncharged, compounds readily diffuse across the bilayer.
D  The bilayer is stabilized by covalent bonds between neighboring phospholipid molecules.
E  The polar head groups face inward toward the inside of the bilayer.
Question #40
A  They undergo constant rotational motion that moves a given domain from the outer face of a membrane to the inner face and then back to the outer.
B  They can be removed from the membrane with high salt or mild denaturing agents.
C  The secondary structure in the transmembrane region consists solely of alpha-helices or beta-sheets.
D  The domains that protrude on the cytoplasmic face of the plasma membrane nearly always have covalently attached oligosaccharides.
Question #41
A  hot water
B  a chelating agent that removes divalent cations
C  a solution containing detergent
D  a buffer
E  a solution of high ionic strength
Question #42
A  may have functional units on both sides of the membrane
B  penetrate deeply into the lipid bilayer
C  are generally noncovalently bound to membrane lipids
D  can be released from membranes only by treatment with detergents