Read the following statements
A) Slime layer is a loose sheath
B) Capsule is a thick and tough layer
C) Capsule protects the bacteria against desiccation.
D) Gummy and sticky character of the bacteria is due to presence of glycocalyx, present between cell and cell membrane.
Important Questions on Microbiology
A) Bacterial flagella do not show 9+2 configuration in their ultra structure.
B) Bacterial flagella composed of both proteins and carbohydrates.
C) All the cocci and bacilli are non-motile.
D) Flagellar movement in bacteria is rotation.
Identify the incorrect statement:
I) Pili is found in E. coli.
II) Teichoic acid is absent in Gram-ve bacteria.
III) Mesosomes increase the absorption of the nutrients in Gram-ve bacteria.
IV) Spherical shaped bacteria do not form chains.
Read the statements:
A) In Gram +ve bacteria infoldings of cell membrane are called mesosomes.
B) Mesosomes help in the formation of daughter cells during endospore formation.
C) Mesosomes do not help in chromosomal replication and its distribution to daughter bacteria.
D) Mesosomes do not increase the absorption of gases.
Select the incorrect statements.
Read the statements and identify the correct option :
) Some bacteria possess plasmids as self replicating, circular ds DNA in the cytoplasm.
) Plasmids can exist independently in the cytoplasm (or) may be integrated with nucleoid.
) Plasmids are also called F-Factors.
) Drug resistance, metabolic pathways and new pathogenic abilities are exhibited by plasmids due to presence of genes.
I) Chemical energy in organic substances
II)
III) Organic form of carbon
IV) Light energy
Study the following table
| Organism | Group | Process | |
| I) | Rhodospirillum | Non-sulphur bacterium | Photo heterotroph |
| II) | Bacillus | Purple sulphur Bacteria | Chemo autotroph |
| III) | Xanthomonas | Parasitic bacterium | Chemo heterotroph |
| IV) | Rhizobium | symbiont bacterium | Photo heterotroph |
Which two taxa shows the correct combination?
I) Rhodospirillum
II) Azospirillum
III) Clostridium
IV) Chlorobacterium
Study the following table
| Type | Example | Role | |
| I) | Sulphur Bacterium | Thiobacillus thiooxidans | Oxidation of elemental sulphur |
| II) | Nitrogen fixing Bacterium | Nitrobacter | Oxidation of nitrites |
| III) | Iron Bacterium | Thiobacillus thiooxidans | Oxidation of Ferric salts to ferrous ions |
| IV) | Hydrogen Bacterium | Hydrogenomonas | Oxidation of |
The correct combination is
