Question 1 (1 point) Question 1 Saved
Which is not a characteristic of mediated transport?
Question 1 options: A) competition B) saturation C) tonicity D) specificity Save
Question 2 (1 point) Question 2 Saved
The rate of diffusion increases if the
Question 2 options: A) concentration gradient decreases. B) temperature of a solution decreases. C) viscosity of a solution decreases. D) All of these are correct. Save
Question 3 (1 point) Question 3 Saved How does the phospholipid bilayer maintain separation between the spaces inside and
outside the cell?
Question 3 options: A)
cell The negative charge outside the cell keeps positively charged molecules inside the B)
The polar portion of the phospholipid membrane does not allow water to move
across the membrane C)
Ion concentrations on either side of the membrane do not allow other molecules to
cross because they have opposing charges D) Proteins in the membrane can only move atoms and molecules in one direction E) None of the above Save
Question 4 (1 point) Question 4 Unsaved
Which of the following is true concerning phospholipids?
Question 4 options: A)
it. the phosphate head is hydrophobic, meaning it dislikes water and turns away from B)
a single layer of phospholipids is sufficient to perform cellular functions. There is a
second layer that serves as a backup. C)
the phospholipid tails are hydrophobic meaning they dislike water and turn away
from it. D) all of the above are TRUE Save
Question 5 (1 point) Question 5 Unsaved
Which of the following influences diffusion rate?
(1) concentration gradient
(2) viscosity
(3) temperature
(4) size of molecules
Question 5 options: A) 1 and 2 only B) 1, 2, and 3 only C) 1 and 3 only D) 2 and 4 only E) all of the above Save
Question 6 (1 point) Question 6 Unsaved
In general, lipid-soluble molecules diffuse through the _____________; small, water-soluble
molecules diffuse through the ______________. Question 6 options: A) membrane channels, lipid bilayer B) membrane channels, carrier proteins C) lipid bilayer, carrier proteins D) carrier proteins, membrane channels Save
Question 7 (1 point) Question 7 Unsaved
The three types of transport proteins are
Question 7 options: A) channel, carrier, and attachment B) leak ion, gated ion, and ligand-gated ion C) channel, ATP-powered pumps, and carrier D) leak ion, ATP-powered pumps, and gated ion Save
Question 8 (1 point) Question 8 Unsaved
The uptake of molecules dissolved in liquid in smaller vesicles through the plasma
membrane is the definition for Question 8 options: A) endocytosis B) phagocytosis C) pinocytosis D) exoytosis Save
Question 9 (1 point) Question 9 Unsaved
The statements about transport of Ca2+ from the cytosol (low Ca2+ concentration) into the
endoplasmic reticulum (high Ca2+ concentration) are true EXCEPT which of the following?
Question 9 options: A) Calcium movement involves the use of a pump. B) Calcium movement involves active transport. C) Calcium movement occurs by facilitated diffusion using a transporter protein. D) Calcium movement requires energy. E) Calcium movement occurs through a transmembrane protein. Save Question 10 (1 point) Question 10 Unsaved
Which of the following statements about diffusion of charged molecules are TRUE.
1 - Passive Diffusion of non-charged particles across a cell membrane continues until
concentrations come to equilibrium
2 - Passive Diffusion of potassium (positive charge) across a membrane continues until
concentrations come to equilibrium.
3 - Diffusion is faster if the temperature is decreased
4 - Diffusion is faster across a cell membrane if the surface area is increased
5 - Membrane permeability depends only on the molecules size
6 - Diffusion of ions across a cell membrane requires a protein channel or transporter
Question 10 options: A) 1,2,3,4,5,6 B) 2,4,5 C) 2,4,5,6 D) 1,4,6 E) 1,2,4,6 Save
Question 11 (1 point) Question 11 Unsaved
Receptor proteins
Question 11 options: A)
are located in the plasma membrane on the inner surface to receive molecules once
they have passed through the membrane B)
has a receptor site for all water soluble materials which can not diffuse through the
membrane C)
has an exposed receptor site on the outer surface which attaches to specific chemical
signals D)
are located in the plasma membrane on the outer surface which attaches to all
chemical signals
Save
Question 12 (1 point) Question 12 Unsaved
The difference between phagocytosis and pinocytosis is
Question 12 options: A) the rate of transportation B) whether the particles are dissolved in a liquid and their size C) the direction of transportation D) the manner in which the vesicles fuse with the membrane Save
Question 13 (1 point) Question 13 Unsaved
Cell membranes are primarily made of which of the following? Question 13 options: A) Cytoskeleton and lipid B) Protein and lipid C) Elastin and Collagen D) Dense fibrous connective tissue Save
Question 14 (1 point) Question 14 Unsaved
The best description of the modern model of the cell membrane is termed the:
Question 14 options: A) phospholipid boundary model B) fluid mosaic model C) dynamic motion model D) plasma membrane model Save
Question 15 (1 point) Question 15 Unsaved
Which statement is NOT true about the saturation of a transport protein?
Question 15 options: A)
low. When the concentration of molecules outside the cell is low, the transport rate is B)
Transport rate increases when all the transport proteins are occupied and the
number of molecules outside the cell is very large. C)
As the concentration difference between molecules outside the cell and inside the
cell increases, the rate of transport increases and then levels off. D)
As long as transportation proteins are available, the transport rate will increase with
an increase in the number of molecules outside the cell.
Save
Question 16 (1 point) Question 16 Unsaved
Which is NOT a way molecules and ions can pass through a plasma membrane?
Question 16 options: A) exoendocytosis B) facilitated diffusion C) active transport D) osmosis Save
Question 17 (1 point) Question 17 Unsaved Small pieces of matter, and even whole cells, can be transported across the plasma
membrane in
Question 17 options: A) membrane channels. B) carrier molecules. C) receptor molecules. D) vesicles. Save
Question 18 (1 point) Question 18 Unsaved
Which of the following statements are true concerning transportation through the plasma
membrane?
Question 18 options: A)
the plasma membrane is considered a permeable membrane, allowing all substances
to pass through it using various transportation means B) active transportation is required for substances to leave the cell C) all non-lipid soluble molecules diffuse through membrane channels D) lipid soluble molecules diffuse directly through the plasma membrane Save Question 19 (1 point) Question 19 Unsaved
Which statement(s) are correct?
I-all membranes parts have their own unique, fixed position.
II-The plasma membrane of muscle cells is ALWAYS permeable to glucose.
III-The phospholipid bilayer is made up of approximately 85% lipid.
IV-Receptor proteins must be a type of peripheral or extrinsic proteins.
V-Epinephrine is a type of receptor in a cell membrane
VI-Simple diffusion is based on the fact that molecules are in constant, random motion.
Because of collisions with each other, and anything else in the particles way, they eventually
disperse- or are evenly distributed throughout the system.
Question 19 options: A) I, IV, V B) VI C) I, II, III D) III, IV E) II F) All of the above Save
Question 20 (1 point) Question 20 Unsaved You are observing a simple diffusion experiment of green food coloring being carefully
added to the surface of two containers holding an equal volume of water, one at 0 degrees C
and the other at 100 degrees C. Your original hypothesis is that because the food coloring is
being added to the surface, it will be traveling down the concentration gradient in both
cases. Therefore diffusion in both systems will be complete at the same time. Is your
hypothesis correct or incorrect?
Question 20 options: A) Correct, all substances naturally travel down their concentration gradients. B) Incorrect, all substances naturally travel up their concentration gradients. C)
Incorrect, because of the increased speed and motion of the water particles in the
100 degree system it will finish diffusion much faster than the 0 degree system. D)
Correct, because there is an equal volume of water in each system it will take the
same amount of time for diffusion to complete (time to diffuse is proportional to the square
of the distance). Question 1 (1 point) Question 1 Unsaved
Placing celery sticks in fresh water will make them more turgid and harder. This is because
_________. Question 1 options: A) Freshwater is hypertonic to the celery. B) Freshwater is hypotonic to the celery. C) Freshwater is isotonic to the celery. D) Freshwater pulls water from the celery. Save
Question 2 (1 point) Question 2 Unsaved
In primary active transport, how do ions move against their concentration gradients?
Question 2 options: A) By using proteins that require ATP to function B) Endocytosis C) Protein Channels D) By using osmosis and facilitated diffusion Save
Question 3 (1 point) Question 3 Unsaved
The process of water diffusing into or out of a cell is called:
Question 3 options: A) active transport B) facilitated diffusion C) phagocytosis D) osmosis Save
Question 4 (1 point) Question 4 Unsaved
Osmotic Pressure is defined as:
Question 4 options: A)
The pressure that is just sufficient to prevent a net movement of water across the
membrane B) The pressure that solutes put on an impermeable membrane when they try to leave C) The pressure applied toat protein channels exert as they use ATP to "pump" water D)
The pressure that forces water from areas of low concentration to areas of high
concentration
Save
Question 5 (1 point) Question 5 Unsaved
Sodium acetate is a commonly used food preservative with the formula NaC2H3O2. This
compound is soluble in water, dissolving to form two ions (Na+ and C2H3O2-). If 2 moles of sodium acetate were dissolved in 1 Liter of water, what would be the osmolarity of the
resulting solution?
Question 5 options: A) 4M B) 2M C) 1M D) 8M Save
Question 6 (1 point) Question 6 Unsaved
Galactose is a simple sugar which is insoluble in water. If 2 moles of galactose were
dissolved in 1 Liter of water, what would be the osmolarity of the resulting solution?
Question 6 options: A) 1M B) 8M C) 2M D) 4M Save
Question 7 (1 point) Question 7 Unsaved Sodium acetate is a commonly used food preservative with the formula NaC2H3O2. This
compound is soluble in water, dissolving to form two ions (Na+ and C2H3O2-). If 2 moles of
sodium acetate were dissolved in 1 Liter of water, what would be the molarity of the
resulting solution?
Question 7 options: A) 1M B) 8M C) 4M D) 2M Save
Question 8 (1 point) Question 8 Unsaved
Which solution would be hypotonic to red blood cells?
Question 8 options: A) 9% NaCl B) 0.9% NaCl C) 0.09% NaCl D) 1.9% NaCl Save Question 9 (1 point) Question 9 Unsaved
Osmosis
Question 9 options: A) is the diffusion of water from a greater to lessor concentration of solutes B) requires a semi-permeable membrane C) only occurs in isotonic solutions D) all of the above are correct statements Save
Question 10 (1 point) Question 10 Unsaved
Red blood cells would swell in which type of solution?
Question 10 options: A) hypotonic B) isotonic C) hypertonic D) hydrophilic E) lipophilic Save Question 12 (1 point) Question 12 Unsaved
After being shipwrecked and stranded on an island, you become thirsty and begin your
search for fresh water. You soon discover that there isn't a single drop on the entire island.
After three days your thirst is unbearable, and you drink exactly three cups of the bluest
seawater you can find (seawater is hypertonic to body fluids). You would expect…
Question 12 options: A) Cells in your intestines to shrink B) Cells in you intestines to swell C) To be thirsty again D) To become rehydrated E) A&D F) B&C G) A&C H) B&D Save
Question 13 (1 point) Question 13 Unsaved For osmosis to occur, in a solution with only one type of solute, the membrane must be
__________ to the solute, and the concentration of the solute must be _________ on the two sides
of the membrane.
Question 13 options: A) permeable, different B) permeable, the same C) impermeable, different D) impermeable, the same Save
Question 14 (1 point) Question 14 Unsaved
A hypoosmotic solution is used to check sperm membrane function. If the sperm cells are
alive, what would the expected outcome be?
Question 14 options: A) The cells would shrink B) The cells would remain the same size C) The cells would crenate D) The cells would swell Save Question 15 (1 point) Question 15 Unsaved
Solution A is hyperosmotic to solution B. If solution A is separated from solution B by a
selectively permeable membrane for water, which way will water move?
Question 15 options: A) Water will move from solution A to solution B. B) Water will move from solution B to solution A. C) Water will not move.. Save
Question 16 (1 point) Question 16 Unsaved
Mannitol is a type of carbohydrate that does not easily cross a cell membrane (it is not a
penetrating solute). Also, Mannitol has a molecular weight very near that of glucose. A
doctor is thinking of giving a trauma patient with brain swelling an IV containing Mannitol.
What percent of Mannitol could the IV contain to reduce brain swelling?
Question 16 options: A) 10% Mannitol B) 5% Mannitol C) 3% Mannitol D) 1% Mannitol Save Question 17 (1 point) Question 17 Unsaved
A cell is placed into a beaker containing sodium chloride dissolved in water. Water rushes
out of the cell and it shrivels up. Which of the following terms best describes the
relationship between the solution inside the beaker and the interior of the cell? Question 17 options: A)
The solution was hyperosmotic with respect to the interior of the cell B)
The two solutions were isosmotic to one another C)
The solution was a 10% dextrose solution. D)
The solution was Hyposmotic with respect to the interior of the cell Save
Question 18 (1 point) Question 18 Unsaved
A solution with greater concentration of solute particles when compared to a more dilute
solution has a ____________ osmotic pressure and is ________________. Question 18 options: A) Greater ; hyposmotic B) Greater ; hyperosmotic C) Lesser ; hyposmotic D) Lesser ; hyperosmotic Save
Question 19 (1 point) Question 19 Unsaved
A cell is placed into a beaker containing sodium chloride dissolved in water. Water rushes
into the cell causing it to swell and ultimately burst. Which of the following terms best
describes the solution inside the beaker compared to the interior of the cell?
Question 19 options: A) Isosmotic B) Hypotonic C) Isotonic D) Hypertonic Save
Question 20 (1 point) Question 20 Unsaved What would happen to the osmolarity and tonicity of the blood compared to red blood cells
if pure water were administered in an IV in place of saline fluid?
Question 20 options: A)
The osmolarity of the blood would decrease and the blood would become hypotonic
compared to red blood cells B)
The osmolarity of the blood would increase and the blood would become hypertonic
compared to red blood cells C)
The osmolarity of the blood would decrease the blood would become hypertonic
compared to red blood cells D)
The osmolarity of the blood would increase and the blood would become hypotonic
compared to red blood cells Question 1 (1 point) Question 1 Unsaved
Concerning resting membrane potential, the inside of the membrane is _______ compared to
the ________ charged outside.
Question 1 options: A) positive, negatively B) negative, positively. C) Neutral, cyclically D) AC (alternating current) Save
Question 2 (1 point) Question 2 Unsaved
Resting cell membrane potential is reached when the inclination for one specific ion to
diffuse out of the cell is balanced by opposite force attractions within the cell. What is the
identity of this balanced ion?
Question 2 options: A) Na+ B) K+ C) Cl- D) Ca++ Save
Question 3 (1 point) Question 3 Unsaved
During resting membrane potential, the charge inside of a cell is _____ compared to the
outside of the cell.
Question 3 options: A) positive B) negative C) neutral D) oscillating Save
Question 4 (1 point) Question 4 Unsaved
Channels that open or close in response to changes in the electrical charge or voltage across
the plasma membrane are called _________
Question 4 options: A) ligand-gated ion channels. B) non-gated ion channels. C) relegated ion channels. D) voltage-gated ion channels. E) obligated ion channels. Save
Question 5 (1 point) Question 5 Unsaved
Graded potentials
Question 5 options: A) result from a chemical signal binding to a receptor B)
is a change in the membrane potential that is localized to one area of the plasma
membrane C) may be due to temperature changes D) can be either depolarizations or hyperpolarizations E) all of the above Save
Question 6 (1 point) Question 6 Unsaved
Which of the following is true concerning leak channels?
Question 6 options: A) They respond to changes in voltage across a membrane. B) They respond to a ligand binding to its receptor protein. C) They cause ion permeability in a resting membrane. D) None of the above. Save
Question 7 (1 point) Question 7 Unsaved
Which of the following statements is correct regarding Na+ and K+ concentrations across a
plasma membrane?
Question 7 options: A)
Concentrations of both K+ and Na+ ions are higher outside of a cell than they are on
the inside of a cell. B)
Concentrations of both K+ and Na+ are higher inside of a cell than they are outside
of a cell. C)
Concentrations of K+ are higher outside of a cell, whereas concentrations of Na+ are
higher inside of a cell. D)
Concentrations of Na+ are higher outside of a cell, whereas concentrations of K+ are
higher inside of a cell.
Save
Question 8 (1 point) Question 8 Unsaved
Which of the following is NOT a characteristic of a graded potential?
Question 8 options: A)
the size of the graded potential is inversely proportional to the strength of the
stimulus B)
are conducted so that the magnitude decreases as they are spread over the plasma
membrane C) a depolarizing potential can cause an action potential D)
can cause depolarization or hyperpolarization dependent upon which ion has
increased permeability Save
Question 9 (1 point) Question 9 Unsaved
Which statement is true?
Question 9 options: A) ATP is required to move Na+ extracellularly B) Ca+ binding to specific ion channels stops the intracellular diffusion of Na+ C) Na+ relies on a specific type of ion channel for diffusion D) All are true E) Two are true F) None are true Save
Question 10 (1 point) Question 10 Unsaved
What is true regarding graded potentials?
Question 10 options: A) They cannot be propagated for a very long distance B) The magnitude of the response is proportional to the to the strength of the stimulus C) They can summate, or add upon each other D) They always precede an action potential E) All are correct. F) Three are correct Save
Question 11 (1 point) Question 11 Unsaved
Which of the following would cause the resting membrane potential of a neuron to move
from: –85mv to –50mv?
1 - Increased permeability to K+
2 - Increased permeability to Na+
3 - Increased concentration of Na+ in the extracellular fluid
4 - Increased activity of the Na+/K+ pump
Question 11 options: A) 1 B) 2 C) 1,2 D) 2,4 E) 1,3 F) 1,4 G) 1,2,3,4 Save
Question 12 (1 point) Question 12 Unsaved
If you increased the concentration of extracellular Na+ of a membrane at resting membrane
potential, what would happen?
Question 12 options: A) hyperpolarization B) depolarization C) hypopolarization D) hardly any change in the membrane potential E) more information is needed. Save
Question 13 (1 point) Question 13 Unsaved
You are observing a simple diffusion experiment of green food coloring being carefully
added to the surface of two containers holding an equal volume of water, one at 0 degrees C
and the other at 100 degrees C. Your original hypothesis is that because the food coloring is
being added to the surface, it will be traveling down the concentration gradient in both cases. Therefore diffusion in both systems will be complete at the same time. Is your
hypothesis correct or incorrect?
Question 13 options: A) Correct, all substances naturally travel down their concentration gradients. B) Incorrect, all substances naturally travel up their concentration gradients. C)
Incorrect, because of the increased speed and motion of the water particles in the
100 degree system it will finish diffusion much faster than the 0 degree system. D)
Correct, because there is an equal volume of water in each system it will take the
same amount of time for diffusion to complete (time to diffuse is proportional to the square
of the distance).
Save
Question 14 (1 point) Question 14 Unsaved
If the plasma membrane becomes more permeable to K+, what effect will it have on the
resting membrane potential?
Question 14 options: A)
Because the membrane is more permeable to K+, less K+ will diffuse out of the cell.
The inside of the cell becomes less negative resulting in depolarization. B)
Because the membrane is more permeable to K+, more K+ will diffuse out of the cell.
The inside of the cell becomes more negative resulting in hyperpolarization. C)
Because the membrane is more permeable to K+, less K+ will diffuse out of the cell.
The inside of the cell becomes less negative and results in hyperpolarization. D)
Because the membrane is more permeable to K+, more K+ will diffuse out of the cell.
The inside of the cell becomes less negative and results in depolarization.
Save
Question 15 (1 point) Question 15 Unsaved
If extracellular concentration of K+ increases, what will the effect be on the resting
membrane potential?
Question 15 options: A)
The increase in extracellular K+ concentration will decrease the normal K+ gradient;
because of this K+ has less of a tendency to diffuse out of the cell. The resting membrane
potential becomes less negative (depolarizes). B)
The increase in extracellular K+ concentration will increase the normal K+ gradient;
because of this K+ has more of a tendency to diffuse out of the cell. The resting membrane
potential becomes more negative (hyperpolarizes). C)
The increase in extracellular K+ concentration will decrease the normal K+ gradient;
because of this K+ has less of a tendency to diffuse out of the cell. The resting membrane
potential becomes less negative (hyperpolarizes). D)
The increase in extracellular K+ will increase the normal K+ concentration gradient;
because of this K+ has more of a tendency to diffuse out of the cell. The resting membrane
potential becomes less negative (depolarizes).
Save
Question 16 (1 point) Question 16 Unsaved
If a plasma membrane becomes more permeable to K+ the charge difference across the
plasma membrane will _________, or (AKA) _________.
Question 16 options: A) increase, depolarize B) increase, hyperpolarize C) decrease, depolarize D) decrease, hyperpolarize Save
Question 17 (1 point) Question 17 Unsaved
The flu virus increases cellular membrane permeability to K+. You would expect the cells of
someone suffering from the flu to _______.
Question 17 options: A) repolarize B) depolarize C) hyperpolarize D) more information is needed. Save
Question 18 (1 point) Question 18 Unsaved
Which statement(s) are correct?
I-all membranes parts have their own unique, fixed position. II-The plasma membrane of muscle cells is ALWAYS permeable to glucose.
III-The phospholipid bilayer is made up of approximately 85% lipid.
IV-Receptor proteins must be a type of peripheral or extrinsic proteins.
V-Epinephrine is a type of receptor in a cell membrane
VI-Simple diffusion is based on the fact that molecules are in constant, random motion.
Because of collisions with each other, and anything else in the particles way, they eventually
disperse- or are evenly distributed throughout the system.
Question 18 options: A) I, IV, V B) VI C) I, II, III D) III, IV E) II F) All of the above Save
Question 19 (1 point) Question 19 Unsaved
If you decreased concentration of K+ OUTSIDE (hypokalemia) of a resting membrane, you
would induce:
Question 19 options: A) depolarization B) hyperpolarization C) absolute refraction D) repolarization Save
Question 20 (1 point) Question 20 Unsaved
If a cell membrane became more permeable to Na+ what would happen to the resting
membrane potential?
Question 20 options: A) Na+ diffuses into the cell causing depolarization. B) Na+ diffuses out of the cell causing depolarization. C) Na+ diffuses out of the cell causing hyperpolarization. D) Na+ diffuses out of the cell causing hyperpolarization. Question 1 (1 point) Question 1 Unsaved
During repolarization:
Question 1 options: A) Na+ ions are diffusing intracellularly B) Na+ ions are diffusing extracellular...

 

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