Question

The cell wall of cyanobacteria
a. Similar to gram +ve bacteria
b. Similar to gram -ve bacteria
c. Does not have cell wall
d. Archaebacteria

Answer 1

Hint: The basic structural and functional unit of the life is cell, where plants and animals all are made of cells, but with little difference in their structure and composition, where cyanobacteria is also called blue green algae, where it is the first photoautotroph that produced on earth, still it is photoautotroph, the cell wall of cyanobacteria is different from that of plants.

Complete answer:
> Cyanobacteria are the prokaryotic cells where the formation of cyanobacteria on the earth reduce the atmosphere and changes had begin with the production of oxygen, and it was the period where chemosynthetic organisms are start declining and lead the formation of photosynthetic organisms.

> Though blue green algae are photosynthetic they are not come under the plantae, where they are prokaryotes as like bacteria, and this prokaryotes are present either free-living or in the symbiotic form with plants, and most of the symbiotic cyanobacteria are nitrogen-fixing bacteria.

> Both cyanobacteria and bacteria are prokaryotes, where they do not have a true nucleus, and they have nucleoid without a nuclear membrane, and they do not have any membrane bound cell organelles in bacteria, but cyanobacteria have membrane-bound plastids which helpful for photosynthesis.

> The cells of the cyanobacteria possess the cell wall, where they have 3 layers that show compartmentalization, and have a thick layer of the peptidoglycan, that makes the cyanobacteria not get stained and it is gram negative bacteria.

Hence, the correct answer is option (B).

Note: Gram staining is the technique where the bacteria are stained and based on that they are divided into gram positive and gram negative, and this staining is depends on the presence of amount or thickness of the peptidoglycan, where the thick layer does not get stained in the gram staining process and make the cell gram negative.