Class 9 Exam > Class 9 Questions > Direction: In the following questions, a sta...
Start Learning for Free
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : A cell membrane shows fluid behaviour.
Reason : A membrane is a mosaic of lipids and proteins.
- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Direction: In the following questions, a statement of assertion (A) i...
A cell membrane shows fluid behaviour. It was proved by fluid- mosaic model of a biomembrane by Singer and Nicolson in 1972. According to this model, the membrane does not have a uniform disposition of lipids and proteins but is a mosaic of the two. Further, the membrane is not solid but is quasi fluid.
View all questions of this test
Most Upvoted Answer
Direction: In the following questions, a statement of assertion (A) i...
Assertion: A cell membrane shows fluid behaviour.
Reason: A membrane is a mosaic of lipids and proteins.
The correct answer is option A - Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Explanation:
The cell membrane is a selectively permeable barrier that separates the internal environment of the cell from the external environment. It plays a crucial role in maintaining the integrity and functionality of the cell. The fluidity of the cell membrane is essential for its proper functioning, and this fluid behavior can be explained by the lipid-protein mosaic model.
Fluid Behavior of the Cell Membrane:
The cell membrane is composed of a bilayer of phospholipids, which are amphipathic molecules with a hydrophilic head and a hydrophobic tail. These phospholipids arrange themselves in a bilayer with their hydrophilic heads facing the aqueous environments (both inside and outside the cell) and their hydrophobic tails facing each other in the interior of the bilayer. This arrangement creates a fluid and dynamic structure.
Lipid-Protein Mosaic Model:
The lipid-protein mosaic model, also known as the fluid mosaic model, describes the structure of the cell membrane. According to this model, the cell membrane is composed of a mosaic of lipids and proteins. The lipids, mainly phospholipids, form the basic framework of the membrane, while the proteins are embedded within or attached to the lipid bilayer.
Explanation of the Reason:
The reason provided in the statement is correct. The fluid behavior of the cell membrane can be attributed to its composition of lipids and proteins. The lipids provide the fluid nature of the membrane due to their amphipathic nature, while the proteins contribute to the mosaic structure by being embedded or attached to the lipid bilayer.
Conclusion:
The fluid behavior of the cell membrane is essential for various cellular processes such as membrane transport, cell signaling, and cell recognition. The lipid-protein mosaic model explains the fluid behavior of the cell membrane, with lipids forming the basic framework and proteins contributing to the mosaic structure. Therefore, both the assertion and reason are true, and the reason correctly explains the assertion.
Reason: A membrane is a mosaic of lipids and proteins.
The correct answer is option A - Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Explanation:
The cell membrane is a selectively permeable barrier that separates the internal environment of the cell from the external environment. It plays a crucial role in maintaining the integrity and functionality of the cell. The fluidity of the cell membrane is essential for its proper functioning, and this fluid behavior can be explained by the lipid-protein mosaic model.
Fluid Behavior of the Cell Membrane:
The cell membrane is composed of a bilayer of phospholipids, which are amphipathic molecules with a hydrophilic head and a hydrophobic tail. These phospholipids arrange themselves in a bilayer with their hydrophilic heads facing the aqueous environments (both inside and outside the cell) and their hydrophobic tails facing each other in the interior of the bilayer. This arrangement creates a fluid and dynamic structure.
Lipid-Protein Mosaic Model:
The lipid-protein mosaic model, also known as the fluid mosaic model, describes the structure of the cell membrane. According to this model, the cell membrane is composed of a mosaic of lipids and proteins. The lipids, mainly phospholipids, form the basic framework of the membrane, while the proteins are embedded within or attached to the lipid bilayer.
Explanation of the Reason:
The reason provided in the statement is correct. The fluid behavior of the cell membrane can be attributed to its composition of lipids and proteins. The lipids provide the fluid nature of the membrane due to their amphipathic nature, while the proteins contribute to the mosaic structure by being embedded or attached to the lipid bilayer.
Conclusion:
The fluid behavior of the cell membrane is essential for various cellular processes such as membrane transport, cell signaling, and cell recognition. The lipid-protein mosaic model explains the fluid behavior of the cell membrane, with lipids forming the basic framework and proteins contributing to the mosaic structure. Therefore, both the assertion and reason are true, and the reason correctly explains the assertion.
Attention Class 9 Students!
To make sure you are not studying endlessly, EduRev has designed Class 9 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 9.
|
Explore Courses for Class 9 exam
|
|
Similar Class 9 Doubts
Top Courses for Class 9View all
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?
Question Description
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?.
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 9.
Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free.
Here you can find the meaning of Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : A cell membrane shows fluid behaviour.Reason : A membrane is a mosaic of lipids and proteins.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 9 tests.
|
|
Explore Courses for Class 9 exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup