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  • Chitin is a major component of Option: 1 Bacterial cell wallOption: 2 Fungal cell wall

Chitin is a major component of 

Option: 1

Bacterial cell wall


Option: 2

Fungal cell wall


Option: 3

Plant cell wall


Option: 4

Protist cell wall 


Answers (1)

best_answer

 

 

The Cell Wall -

1. Structure of the cell wall
Cell wall is the outermost non-living covering in fungal and plant cells. 
Cell wall of algae is made of cellulose, galactans, mannans and minerals like calcium carbonate, while in other plants it consists of cellulose, hemicellulose, pectins and proteins. 
Fungal cell wall is made up of chitin (acetylglucosamine polymers), glucans, polysaccharides and mucopolysaccharides, waxes, and pigments.

A typical cell wall is made up of:
a) Matrix: It is a gel-like ground substance consisting of 30 - 60% water, Hemicellulose, 2 - 8% pectin, 0.5 - 3 % lipids, 1 - 2 % proteins. 

b) Microfibrils: It is approximately 20-40%. It is a structural element of the cell wall, also called as the steel bars of the cell wall.  In plants, microfibrils are composed of cellulose. In fungi, it is composed of fungal cellulose, which is equivalent to chitin.

c) Depositions on the cell wall:  

1. Lignin: 
- associated with sclerenchyma cells, tracheids, and vessels. 
- it is a non-polysaccharide compound 
- provides hardness, and stiffness to the cell wall 

2. Suberin: 
- it is a hydrophobic substance 
- prevents water loss from the organ 
- examples: cork cells, endodermis (casparian strips) 

3. Cutin: 
- it is a waxy substance 
- hydrophobic in nature 
- present on epidermal cells 
- reduce water loss from the leaves 

4. Silica: 
- It is associated with grasses, Equisetum (pteridophytes) 
- provides protection, hardness/stiffness 
- protects the grass from grazing animals 

5. Calcium, Iron deposition 
Example: Chara 

 

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Chitin is a major component of fungal cell wall
 

Posted by

shivangi.bhatnagar

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