Structure of Integral and Peripheral Proteins Quiz
The integral proteins, known as intrinsic proteins, and the peripheral proteins are called extrinsic proteins. Play this quiz to learn more about the structure of proteins. Integral proteins are relatively insoluble and difficult to dissociate from the membrane, in contrast to the peripheral proteins, which are soluble and easily separate from the membrane. The quiz will provide you with valuable information about the topic that would greatly help you in exam. Play this quiz to know more. All the best!
- 1.
How much of the inner membrane of the mitochondria is made up of protein?
- A.
50%
- B.
80%
- C.
76%
- D.
90%
Correct Answer
C. 76%Explanation
The correct answer is 76% because the inner membrane of the mitochondria is primarily composed of proteins, which make up a significant portion of its structure. These proteins play crucial roles in various functions of the mitochondria, such as electron transport and ATP synthesis. The remaining percentage is made up of lipids, including phospholipids and cholesterol, which provide structural support to the membrane.Rate this question:
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- 2.
How much of the myelin membrane, which covers the nerve axons, is made up of protein?
- A.
25%
- B.
18%
- C.
20%
- D.
50%
Correct Answer
B. 18%Explanation
The correct answer is 18%. Myelin is a substance that covers the nerve axons and is composed of both protein and lipids. While the exact composition may vary, on average, approximately 18% of the myelin membrane is made up of protein.Rate this question:
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- 3.
Which is not a membrane protein's function?
- A.
Cell division
- B.
Intercellular transportation
- C.
Cell adhesion
- D.
Cell interaction
Correct Answer
A. Cell divisionExplanation
The function of a membrane protein refers to its role in various cellular processes. Cell division is not a function of membrane proteins. Membrane proteins are involved in intercellular transportation, cell adhesion, and cell interaction, which are essential for communication, signaling, and maintaining the structural integrity of cells. However, cell division is primarily regulated by specific proteins and enzymes that are not necessarily associated with the cell membrane.Rate this question:
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- 4.
Which of the following protein types avoids coming into contact with the phospholipid bilayer's hydrophobic core?
- A.
Membrane proteins
- B.
Peripheral proteins
- C.
Intrinsic proteins
- D.
Integral proteins
Correct Answer
B. PeripHeral proteinsExplanation
Peripheral proteins are the protein types that avoid coming into contact with the phospholipid bilayer's hydrophobic core. Unlike integral proteins, which are embedded within the membrane, peripheral proteins are loosely bound to the surface of the membrane. This positioning allows them to interact with the hydrophilic heads of the phospholipids, avoiding contact with the hydrophobic tails in the core of the bilayer. Peripheral proteins often serve as receptors or enzymes and can be easily detached from the membrane without disrupting its structure.Rate this question:
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- 5.
Which protein is not found in peripheral membranes?
- A.
Signal peptidase
- B.
Phospholipases
- C.
DNA polymerase
- D.
None of the above
Correct Answer
C. DNA polymeraseExplanation
DNA polymerase is not found in peripheral membranes because it is primarily located in the nucleus, where it carries out the replication of DNA. Peripheral membranes, on the other hand, are located at the periphery of the cell and are involved in processes such as signal transduction and membrane trafficking. Therefore, DNA polymerase does not belong to the category of proteins found in peripheral membranes.Rate this question:
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- 6.
Which of the following is a protein found in peripheral membranes?
- A.
D proteins
- B.
G proteins
- C.
Glycophorin
- D.
None of the above
Correct Answer
B. G proteinsExplanation
G proteins are a type of protein that are found in peripheral membranes. They are involved in signal transduction, relaying signals from cell surface receptors to intracellular signaling pathways. G proteins play a crucial role in various cellular processes such as cell growth, differentiation, and metabolism. Therefore, out of the given options, G proteins are the correct answer as they are specifically known to be found in peripheral membranes.Rate this question:
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- 7.
Which proteins are the loosely connected cytoskeleton proteins with the cytosolic face of the bilayer?
- A.
Intrinsic proteins
- B.
Integral proteins
- C.
Peripheral proteins
- D.
G proteins
Correct Answer
C. PeripHeral proteinsExplanation
Peripheral proteins are the loosely connected cytoskeleton proteins with the cytosolic face of the bilayer. These proteins are not embedded within the lipid bilayer like integral proteins, but rather associate with the membrane indirectly through electrostatic interactions or by being anchored to integral proteins. They can be easily detached from the membrane without disrupting the lipid bilayer. Peripheral proteins play important roles in cell signaling, membrane trafficking, and maintaining cell shape and structure.Rate this question:
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- 8.
Which proteins are said to have reversible cell membrane binding?
- A.
Anchored proteins
- B.
Membrane proteins
- C.
Intrinsic proteins
- D.
Peripheral membrane proteins
Correct Answer
D. PeripHeral membrane proteinsExplanation
Peripheral membrane proteins are proteins that are temporarily attached to the cell membrane through weak interactions, such as electrostatic forces or hydrogen bonding. These proteins can easily detach from the membrane and move within the cell or interact with other proteins. This reversibility allows peripheral membrane proteins to dynamically regulate various cellular processes, such as signal transduction and membrane trafficking. In contrast, anchored proteins are permanently attached to the cell membrane, while membrane proteins and intrinsic proteins are broad categories that can include both reversible and irreversible binding to the cell membrane.Rate this question:
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- 9.
Which protein among the following is also referred to as an intrinsic protein?
- A.
Intracytoplasmic proteins
- B.
Lipid-anchored proteins
- C.
Integral membrane proteins
- D.
Peripheral proteins
Correct Answer
C. Integral membrane proteinsExplanation
Integral membrane proteins are also referred to as intrinsic proteins because they are embedded within the lipid bilayer of the cell membrane. These proteins have hydrophobic regions that interact with the hydrophobic core of the membrane, allowing them to span across the membrane. They play crucial roles in various cellular processes such as transport of molecules across the membrane, cell signaling, and cell adhesion.Rate this question:
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- 10.
A transmembrane protein is which of the following?
- A.
GPCR
- B.
Glycophorin
- C.
Bacteriorhodopsin
- D.
G protein
Correct Answer
D. G proteinExplanation
A transmembrane protein refers to a protein that spans across the cell membrane, with portions of it on both the inside and outside of the cell. G proteins are a type of transmembrane protein that play a crucial role in signal transduction, relaying signals from cell surface receptors to intracellular pathways. GPCRs (G-protein coupled receptors), glycophorin, and bacteriorhodopsin are all examples of transmembrane proteins, but G protein specifically refers to a class of proteins involved in signal transduction.Rate this question:
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Current Version
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Sep 12, 2024Quiz Edited by
ProProfs Editorial Team -
Nov 09, 2022Quiz Created by
Amit Mangal
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