Significance of Cell Membrane


 
 
Concept Explanation
 

Significance of Cell Membrane

Significance of Cell Membrane

·   The net movement of substances is from high concentration to lower concentration. There is no expenditure of cellular energy.

Cell membrane is selectively permeable and flexible. This is because it is made up of organic molecules called lipids and proteins. The transport of some substances is against the concentration gradient. This requires cellular energy. Organic molecules like glucose and inorganic ions like sodium and potassium are transported in this way.

Sample Questions
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Question : 1

Which of the following are correct :

(a) The net movement of substances is from high concentration to lower concentration.

(b) Cell membrane is selectively permeable and flexible.

(c) When substances are moved from high concentration to low concentration, than there is no expenditure of cellular energy.

Right Option : D
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Explanation
Question : 2

Which of the following are correct :

(a) Cell membrane is selectively permeable and flexible.

(b) Cell membrane is made up of organic molecules called lipids and proteins.

Right Option : C
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Explanation
Question : 3

The net movement of the substances from higher to lower concentration is called as ______________________.

Right Option : A
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Explanation
 
 
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