Bio 212 Exam 1 Study Questions and Answers
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which usually moves molecules in a direction opposite to the one in which diffusion
moves them
The structure of a biological membrane is best described by the _______ model fluid
mosaic
In the intestine, Na+ and an amino acid bind to the same transport protein that moves the two
substances in the same direction. This transporter is a(n) symporter
Which of the following statements about channel proteins is true? All of the above (They
have a central pore of polar amino acids and water, they are anchored in the hydrophobic bilayer
of the plasma membrane, They are surrounded by nonpolar amino acids, They are often gated.)
The process of osmosis allows water molecules to pass through specialized channels in
membranes. Which of the following statements about osmosis is true? Water will move
across a membrane to a region with more solute.
, Bio 212 Exam 1 Study Questions and Answers
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If there is a concentration gradient of glucose across a membrane, The glucose molecules
are more numerous on one side of the membrane than on the other.
If equal volumes of differently colored solutions are poured into opposite sides of a shallow pool
of water, what will be the result at equilibrium? The solutions will be uniformly
distributed throughout the pool.
If a hospital patient is mistakenly given an IV of pure water instead of a saline solution that is
isotonic to blood, the patient's red blood cells will absorb water from the plasma and
eventually burst.
The sodium‒potassium pump found in animal cells is a(n) antiporter
For each molecule of ATP consumed during active transport of sodium and potassium, there is an
import of _______ ion(s) and an export of _______ ion(s) two K+; three Na+
In a biological membrane, the phospholipids are arranged in a _______, with the _______.
bilayer; fatty acids pointing toward each other
, Bio 212 Exam 1 Study Questions and Answers
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If a cell membrane lacking integral proteins is prepared by freeze fracture and examined under
the electron microscope, the exposed interior of the membrane bilayer will look smooth.
The hydrophilic regions of a membrane protein would most likely be found exposed on
the surface of the membrane.
The LDL receptor is an integral membrane protein that extends both outside and into the interior
of the cell. The amino acid side chains (R groups) in the region of the protein that crosses the
membrane are most likely hydrophobic
Which type of membrane protein would likely be removed most easily from a cell membrane in
a laboratory experiment? Peripheral proteins Peripheral proteins
The compounds in a biological membrane that form a barrier to the movement of hydrophilic
materials across the membrane are lipids lipids
, Bio 212 Exam 1 Study Questions and Answers
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The sodium‒potassium pump changes shape in response to the hydrolysis of ATP and
phosphorylation
If the hydrophilic side chains of a transmembrane protein were removed, the protein would most
likely remain with the phospholipid bilayer
Equilibrium in a solution is the endpoint of diffusion the endpoint of diffusion
Hypotonic when comparing two solutions, the solution with the lesser concentration of
solutes
Isotonic when the concentration of two solutions is the same
Hypertonic when comparing two solutions, the solution with the greater concentration of
solutes
Facilitated diffusion is an example of passive transport
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which usually moves molecules in a direction opposite to the one in which diffusion
moves them
The structure of a biological membrane is best described by the _______ model fluid
mosaic
In the intestine, Na+ and an amino acid bind to the same transport protein that moves the two
substances in the same direction. This transporter is a(n) symporter
Which of the following statements about channel proteins is true? All of the above (They
have a central pore of polar amino acids and water, they are anchored in the hydrophobic bilayer
of the plasma membrane, They are surrounded by nonpolar amino acids, They are often gated.)
The process of osmosis allows water molecules to pass through specialized channels in
membranes. Which of the following statements about osmosis is true? Water will move
across a membrane to a region with more solute.
, Bio 212 Exam 1 Study Questions and Answers
100% Solved
If there is a concentration gradient of glucose across a membrane, The glucose molecules
are more numerous on one side of the membrane than on the other.
If equal volumes of differently colored solutions are poured into opposite sides of a shallow pool
of water, what will be the result at equilibrium? The solutions will be uniformly
distributed throughout the pool.
If a hospital patient is mistakenly given an IV of pure water instead of a saline solution that is
isotonic to blood, the patient's red blood cells will absorb water from the plasma and
eventually burst.
The sodium‒potassium pump found in animal cells is a(n) antiporter
For each molecule of ATP consumed during active transport of sodium and potassium, there is an
import of _______ ion(s) and an export of _______ ion(s) two K+; three Na+
In a biological membrane, the phospholipids are arranged in a _______, with the _______.
bilayer; fatty acids pointing toward each other
, Bio 212 Exam 1 Study Questions and Answers
100% Solved
If a cell membrane lacking integral proteins is prepared by freeze fracture and examined under
the electron microscope, the exposed interior of the membrane bilayer will look smooth.
The hydrophilic regions of a membrane protein would most likely be found exposed on
the surface of the membrane.
The LDL receptor is an integral membrane protein that extends both outside and into the interior
of the cell. The amino acid side chains (R groups) in the region of the protein that crosses the
membrane are most likely hydrophobic
Which type of membrane protein would likely be removed most easily from a cell membrane in
a laboratory experiment? Peripheral proteins Peripheral proteins
The compounds in a biological membrane that form a barrier to the movement of hydrophilic
materials across the membrane are lipids lipids
, Bio 212 Exam 1 Study Questions and Answers
100% Solved
The sodium‒potassium pump changes shape in response to the hydrolysis of ATP and
phosphorylation
If the hydrophilic side chains of a transmembrane protein were removed, the protein would most
likely remain with the phospholipid bilayer
Equilibrium in a solution is the endpoint of diffusion the endpoint of diffusion
Hypotonic when comparing two solutions, the solution with the lesser concentration of
solutes
Isotonic when the concentration of two solutions is the same
Hypertonic when comparing two solutions, the solution with the greater concentration of
solutes
Facilitated diffusion is an example of passive transport
