campbell biology Exam Practice Questions and Answers
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Course
Campbell Biology
Institution
Campbell Biology
campbell biology Exam Practice
Questions and Answers
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...
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. - Answer✔️✔️-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. -
Answer✔️✔️-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.
- Answer✔️✔️-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?
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