Question

This about cell wall of gram-positive bacteria is true
A. Cell wall comprises of many layers
B. The cell wall is thicker than the associated gram-negative bacteria
C. Cell wall comprises of teichoic acids
D. All of the above

Answer 1

Hint:
The bacterial cells have a chemical complex cell envelope that consists of a tightly bound three-layered structure namely; glycocalyx, cell wall, and plasma membrane. On the basis of the cell envelope and the manner in which they respond to the staining procedure, bacteria are classified into gram-positive and gram-negative bacteria.

Complete answer:
The gram staining procedure is a technique that helps in differentiating two types of bacteria. The gram-positive bacteria take up the violet colour of crystal violet dye whereas gram-negative bacteria do not. The gram-negative bacteria laters take up the pink colour of counterstain (safranin) when added.
The gram-positive bacteria has many layers of peptidoglycan which forms a protective covering whereas gram-negative bacteria have a very small layer of 2-3 interconnected layers of peptidoglycan.
The gram-positive bacteria lack an outer membrane but have a thick layer of peptidoglycan as compared to gram-negative bacteria.
The cell wall of gram-positive bacteria has teichoic acids which contribute to the stability of the cell. It increases the resistance of bacteria to adverse environmental conditions. Gram-negative bacteria lack teichoic acids in their cell wall because the structure of the cell wall is completely different from theirs.
Thus, the correct answer is:- All of the above.

Option ‘D’ is correct

Note:
The gram-positive bacteria are non-pathogenic and are present inside our body such as they are present in the mouth, skin, intestine, etc. They are also used in the making of swiss cheese and some are used in the industrial production of enzymes, amino acids, etc.