What is the main groups of bacteria according to their source of energy?

According to the way they obtain energy, bacteria are classified as heterotrophs or autotrophs. Autotrophs make their own food by using the energy of sunlight or chemical reactions, in which case they are called chemoautotrophs. Heterotrophs obtain their energy by consuming other organisms.

What is a major source of energy used by bacteria?

Bacteria, like mammalian and plant cells, use ATP or the high-energy phosphate bond (~ P) as the primary chemical energy source. Bacteria also require the B-complex vitamins as functional coenzymes for many oxidation-reduction reactions needed for growth and energy transformation.

What is the main group of bacteria?

Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). They can exist as single cells, in pairs, chains or clusters. Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow.

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How can you classify bacteria on the basis of source of energy?

On the basis of energy source organisms are designated as:

  • Phototrophs:
  • Chemotrophs:
  • Lithotrophs:
  • Organotrophs:
  • (i) Photoautotrophs.
  • Purple Sulphur Bacteria:
  • Green Sulphur Bacteria:
  • (ii) Chemoautotrophs.

What are the 3 main bacteria?

The three basic shapes of bacteria include cocci (blue), bacilli (green), and spirochetes (red).

Can bacteria be our main source of energy?

For example, bacteria and other micro-organisms can be used to produce biofuel, in what is known as microbial biofuel cells. Of particular interest in an energy context are the photosynthesising bacteria. If they are attached to an electrode, they can generate electric energy when exposed to light.

How are organisms grouped based on the source of energy?

Organisms may be classified according to their source of carbon. Autotrophs convert inorganic carbon dioxide into organic carbon; heterotrophs use fixed organic carbon compounds. … Chemotrophs get their energy from chemical compounds. Organotrophs use organic molecules, and lithotrophs use inorganic chemicals.

What are the two main groups of bacteria?

Although the term bacteria traditionally included all prokaryotes, the scientific classification changed after the discovery in the 1990s that prokaryotes consist of two very different groups of organisms that evolved from an ancient common ancestor. These evolutionary domains are called Bacteria and Archaea.

What are the major groups of organisms?

Small and Mighty: Introduction to Microbiology

In contrast to viruses, bacteria, archaea, protists and fungi are all cellular, living organisms. They have a DNA genome and make machinery to produce their own proteins. They are divided into two main groups based on their cell structure: Prokaryotes and Eukaryotes.

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What is the most common type of bacteria?

The following is a comprehensive list of 25 of the most common bacteria and viruses causing HAIs:

  • Escherichia coli. …
  • Klebsiella pneumoniae. …
  • Morganella morganii. …
  • Mycobacterium abscessus. …
  • Psuedomonas aeruginosa. …
  • Staphylococcus aureus. …
  • Stenotrophomonas maltophilia. …
  • Mycobacterium tuberculosis.

How are bacteria classified on the basis of their mode of nutrition class 11?

On the basis of the modes of nutrition the bacteria are grouped into two types: (A) Autotrophic bacteria. (B) Heterotrophic bacteria. … Such bacteria synthesize their carbohydrate food in presence of sunlight by photosynthesis and are known as chlorophyll bacteria.

What are the nutritional groups of bacteria based on their source of energy and carbon?


  • Chemoautotrophs: microbes that oxidize inorganic chemical substances as sources of energy and carbon dioxide as the main source of carbon.
  • Chemoheterotrophs: microbes that use organic chemical substances as sources of energy and organic compounds as the main source of carbon.

How are bacteria classified based from their pH?

Bacteria are generally neutrophiles. They grow best at neutral pH close to 7.0. Acidophiles grow optimally at a pH near 3.0. Alkaliphiles are organisms that grow optimally between a pH of 8 and 10.5.