Question

Describe the important character of eubacteria ?

Answer 1

1.They are unicellular ,procaryotic microscopic cells.
2.their ell membrane contains lipids made up of glycerol-ester lipids.
3.the cell is made up of peptidoglycan  (murien)
4.chromosome is circular and nucleosomes may be present.
5.genetic exchange takes place through undirectional or or bidirectional 
DNA transfer.
6.ribosomes are of 70s type made up of two subunits i.e,50s-larger subunitand 30s-smaller subunit.
7.coupled transcription and translation takes place
8.they can be grouped under two categories:gram positive bacteria  and gram negative bacteria depending on the nature of the cell wall and the stain which they take up during grams staining

Answer 2

Answer :

Eubacteria -

• Eubacteria is a type of bacteria included in Kingdom Monera.
• They are also referred to as true bacteria.
• They have a rigid cell wall and flagellum if they are mobile.
• There are three types of eubacteria found in this world.
• The first one is referred to as photosynthetic autotrophs.
• The second one are chemosynthetic autotrophs.
• The third type of eubacteria is referred to as heterotrophic bacteria.

Photosynthetic autotrophs -

• They have a chlorophyll which is similar to that of a green plant.
• They can be unicellular, colonial or filamentous.
• They are terrestrial or Marine algae.
• The colonies are generally surrounded by gelatinous sheath.
• They open grow in polluted water bodies.
• Some of them are involved in fixing atmospheric nitrogen in specialised cells called heterocysts.
• Example : Nostoc, Anabaena.

Chemosynthetic autotrophs -

• They are involved in oxidizing inorganic substances such as nitrates, nitrites and ammonia.
• The energy released by oxidizing these inorganic substances is used by them to produce ATP.
• They play a great role in recycling nutrients like nitrogen, Phosphorus, iron and sulphur.

Heterotrophic Bacteria -

• They are most abundant in nature and decomposers in majority.
• They are used in making curd from milk.
• They are also used in production of antibiotics.
• They fix nitrogen in legume roots.
• Some of the heterotrophic bacteria are found to be pathogens which cause damage to humans, crops, animals, etc.
• Eg - Cholera, Typhoid, Tetanus, Citrus canker, etc.