All Editions Complete _ Campbell Biology 11th, 12th
and Latest 2024 Edtion (Urry, Cain, Wasserman) Each
with Chapter 1-56
1) The fluid mosaic model of the membrane proposed that membranes
A) consist of a phospholipid bilayer composed of a variety of fatty acids.
B) consist of protein molecules embedded in a fluid bilayer of phospholipids.
C) consist of a single layer of phospholipids and proteins.
D) consist of a phospholipid bilayer between two layers of hydrophilic proteins. -
ANSWERB
2) Which of the following are localized on the exterior of a phospholipid bilayer?
A) saturated fatty acids
B) unsaturated fatty acids
C) phosphate groups
D) cholesterol - ANSWERC
3) The primary structural components of the cell membrane are
A) phospholipids and cellulose.
B) phospholipids and proteins.
C) cholesterol and proteins.
D) proteins and cellulose.
E) glycoproteins and cholesterol. - ANSWERB
4) When biological membranes are frozen and then fractured, they tend to break
along the middle of the bilayer. The best explanation for this is that
A) the integral membrane proteins are not strong enough to hold the bilayer
together.
B) water that is present in the middle of the bilayer freezes and is easily fractured.
C) the hydrophobic interactions between the fatty acid tails of the two phospholipid
monolayers are the weakest interactions in the membrane.
D) the carbon-carbon bonds of the phospholipid tails are easily broken. - ANSWERC
5) A primary function of cholesterol in the plasma membranes of some animals is to
A) make the membrane more rigid, allowing it to resist pressure from outside the
cell.
B) facilitate the removal of hydrogen atoms from saturated phospholipids.
C) facilitate cell-cell interactions by binding to receptors on neighboring cells.
D) enable the membrane to stay fluid more easily when the temperature drops. -
ANSWERD
6) According to the fluid mosaic model of cell membranes, which of the following is a
true statement about membrane phospholipids?
A) They can move laterally along the plane of the membrane.
B) They frequently flip-flop from one side of the membrane to the other.
, C) They occur in an uninterrupted bilayer, with membrane proteins restricted to the
surface of the membrane.
D) They are free to depart from the membrane and dissolve in the surrounding
solution. - ANSWERA
7) Which of the following is one of the ways that the membranes of winter wheat
are able to remain fluid when it is extremely cold?
A) by increasing the average length of the fatty acid tails in membrane
B) by decreasing the percentage of cholesterol molecules in the membrane
C) by decreasing the number of hydrophobic proteins in the membrane
D) by increasing the percentage of unsaturated phospholipids in the membrane -
ANSWERD
8) An integral membrane protein would have to be
A) hydrophilic.
B) hydrophobic.
C) amphipathic, with at least one hydrophobic region.
D) exposed to water on only one surface of the membrane. - ANSWERC
9) Which of the following tend to lack hydrophobic regions on their surface?
A) transmembrane proteins
B) integral proteins
C) peripheral proteins
D) integrins
E) cholesterol - ANSWERC
10) How do unsaturated fatty acids help keep any membrane more fluid at lower
temperatures?
A) The double bonds form kinks in the fatty acid tails that prevent adjacent lipids
from packing tightly together.
B) Unsaturated fatty acids have a higher cholesterol content that prevents adjacent
lipids from packing tightly together.
C) Unsaturated fatty acids are more polar than saturated fatty acids.
D) The double bonds result in shorter fatty acid tails and therefore thinner
membranes. - ANSWERA
11) Which of the following is true of integral membrane proteins?
A) They serve only a structural role in membranes.
B) They are loosely bound to the surface of the bilayer.
C) They are usually transmembrane proteins.
D) They are not mobile within the bilayer. - ANSWERC
12) A primary function of polysaccharides attached to glycoproteins and glycolipids
of animal cell membranes is to
A) facilitate diffusion of active transport of molecules into the cell.
B) mediate cell-to-cell recognition.
C) maintain the integrity of a fluid mosaic membrane.
and Latest 2024 Edtion (Urry, Cain, Wasserman) Each
with Chapter 1-56
1) The fluid mosaic model of the membrane proposed that membranes
A) consist of a phospholipid bilayer composed of a variety of fatty acids.
B) consist of protein molecules embedded in a fluid bilayer of phospholipids.
C) consist of a single layer of phospholipids and proteins.
D) consist of a phospholipid bilayer between two layers of hydrophilic proteins. -
ANSWERB
2) Which of the following are localized on the exterior of a phospholipid bilayer?
A) saturated fatty acids
B) unsaturated fatty acids
C) phosphate groups
D) cholesterol - ANSWERC
3) The primary structural components of the cell membrane are
A) phospholipids and cellulose.
B) phospholipids and proteins.
C) cholesterol and proteins.
D) proteins and cellulose.
E) glycoproteins and cholesterol. - ANSWERB
4) When biological membranes are frozen and then fractured, they tend to break
along the middle of the bilayer. The best explanation for this is that
A) the integral membrane proteins are not strong enough to hold the bilayer
together.
B) water that is present in the middle of the bilayer freezes and is easily fractured.
C) the hydrophobic interactions between the fatty acid tails of the two phospholipid
monolayers are the weakest interactions in the membrane.
D) the carbon-carbon bonds of the phospholipid tails are easily broken. - ANSWERC
5) A primary function of cholesterol in the plasma membranes of some animals is to
A) make the membrane more rigid, allowing it to resist pressure from outside the
cell.
B) facilitate the removal of hydrogen atoms from saturated phospholipids.
C) facilitate cell-cell interactions by binding to receptors on neighboring cells.
D) enable the membrane to stay fluid more easily when the temperature drops. -
ANSWERD
6) According to the fluid mosaic model of cell membranes, which of the following is a
true statement about membrane phospholipids?
A) They can move laterally along the plane of the membrane.
B) They frequently flip-flop from one side of the membrane to the other.
, C) They occur in an uninterrupted bilayer, with membrane proteins restricted to the
surface of the membrane.
D) They are free to depart from the membrane and dissolve in the surrounding
solution. - ANSWERA
7) Which of the following is one of the ways that the membranes of winter wheat
are able to remain fluid when it is extremely cold?
A) by increasing the average length of the fatty acid tails in membrane
B) by decreasing the percentage of cholesterol molecules in the membrane
C) by decreasing the number of hydrophobic proteins in the membrane
D) by increasing the percentage of unsaturated phospholipids in the membrane -
ANSWERD
8) An integral membrane protein would have to be
A) hydrophilic.
B) hydrophobic.
C) amphipathic, with at least one hydrophobic region.
D) exposed to water on only one surface of the membrane. - ANSWERC
9) Which of the following tend to lack hydrophobic regions on their surface?
A) transmembrane proteins
B) integral proteins
C) peripheral proteins
D) integrins
E) cholesterol - ANSWERC
10) How do unsaturated fatty acids help keep any membrane more fluid at lower
temperatures?
A) The double bonds form kinks in the fatty acid tails that prevent adjacent lipids
from packing tightly together.
B) Unsaturated fatty acids have a higher cholesterol content that prevents adjacent
lipids from packing tightly together.
C) Unsaturated fatty acids are more polar than saturated fatty acids.
D) The double bonds result in shorter fatty acid tails and therefore thinner
membranes. - ANSWERA
11) Which of the following is true of integral membrane proteins?
A) They serve only a structural role in membranes.
B) They are loosely bound to the surface of the bilayer.
C) They are usually transmembrane proteins.
D) They are not mobile within the bilayer. - ANSWERC
12) A primary function of polysaccharides attached to glycoproteins and glycolipids
of animal cell membranes is to
A) facilitate diffusion of active transport of molecules into the cell.
B) mediate cell-to-cell recognition.
C) maintain the integrity of a fluid mosaic membrane.
