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Campbell biology | Questions And Answers Latest {} A+ Graded | 100% Verified
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Campbell biology | Questions And Answers Latest {} A+ Graded | 100% Verified
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Campbell biology | Questions And Answers Latest {2024- 2025} A+ Graded | 100%Verified
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. - B
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 - C
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. - B
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. - C
, 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. - D
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. - A
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 - D
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. - C
9) Which of the following tend to lack hydrophobic regions on their surface?
A) transmembrane proteins
B) integral proteins
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