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campbell biology Exam Practice Questions and Answers
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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...

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  • September 13, 2024
  • 18
  • 2024/2025
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©SOPHIABENNETT
EXAM_SOLUTIONS GUARANTEED SUCCESS 2024/2025 ACADEMIC YEAR




©SOPHIABENNETT 9/3/24 2024/2025

, ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM



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 layer of phospholipids and proteins.

D) consist of a phospholipid bilayer between two layers of hydrophilic proteins. -

Answer✔️✔️-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 - Answer✔️✔️-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. - Answer✔️✔️-B




Page | 1

, ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM


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?


Page | 2

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