They are few micrometers in length and possess several shapes such as spheres, rods, and spirals. They are vital in recycling nutrients by decomposing organic materials and fixation of nitrogen from the atmosphere in nutrient cycles. Bacteria exhibit a variety of metabolic types as well. Aerobic and anaerobic bacteria are the two groups of bacteria classified based on the type of respiration.
The main difference between aerobic and anaerobic bacteria is that anaerobic bacteria use molecular oxygen as the final electron acceptor in the electron transport chain whereas anaerobic bacteria use other molecules or compounds as the final electron acceptor. Aerobic bacteria refer to the microorganisms that grow in the presence of oxygen. The four types of bacteria that can utilize oxygen are obligate aerobes, facultative anaerobes, microaerophils, and aerotolerant anaerobes.
Obligate aerobes use oxygen to oxidize sugars and fats to generate energy in a process called cellular respiration. If oxygen is available, facultative anaerobes use oxygen for their respiration. Microaerophils require oxygen to survive, but require environments containing lower levels of oxygen than are present in the atmosphere. Aerotolerant anaerobes do not require oxygen but, they are not harmed by oxygen as anaerobic bacteria. The behavior of different types of bacteria in a liquid culture is shown in figure 1.
Aerobic bacteria oxidize monosaccharides such as glucose in the presence of oxygen through cellular respiration. The three steps of aerobic respiration are Krebs cycle, glycolysis , and oxidative phosphorylation. During glycolysis, glucose C6 is broken down into two pyruvates C3 molecules in the cytoplasm.
In the presence of oxygen, pyruvate combines with oxaloacetate C4 in order to form citrate C6 , eliminating acetyl-CoA during the citric acid cycle. Please note: comment moderation is enabled and may delay your comment. There is no need to resubmit your comment. Notify me of followup comments via e-mail.
Written by : Jilani. User assumes all risk of use, damage, or injury. You agree that we have no liability for any damages. Aerobic bacteria uses the oxygen present in the air for energy metabolism, versus anaerobic bacteria that does not need oxygen from the air for energy metabolism This can be understood by doing an experiment to identify them by growing aerobic and anaerobic bacteria in a liquid culture.
Summary: 1. Author Recent Posts. Latest posts by Jilani see all. Help us improve. Rate this post! The utilise atmospheric oxygen to oxidise substrates such as sugar and fats to generate energy and carry out metabolic activities. Aerobic microorganisms use glycolysis, the Krebs TCA cycle and electron transport chain with oxygen as the final electron acceptor.
The enzymes used are catalase, peroxidase and superoxide dismutase. Facultative Aerobes: The aerobes use oxygen when it is available but are not solely reliant on it. They have anaerobic methods of energy production.
Microaerophiles: T hey require oxygen for energy production. However, a high concentration of atmospheric oxygen is harmful to them. They use fermentation reactions for energy and do not have an electron transport system. Aerotolerant Aerobes: They do not use oxygen for metabolic activities and are not harmed by it.
They lack all three enzymes needed to break down oxygen. Aerobic Bacteria Examples: Some examples of aerobic bacteria are Nocardia sp. Pseudomonas aeruginosa, Mycobacterium tuberculosis etc. In this section, we will discuss the differences between aerobic and anaerobic bacteria.
You can also send emails directly to for inquiries. Tel: Fax: Email: info cd-genomics. References Arber, W. Genetic variation: molecular mechanisms and impact on microbial evolution. Karakashev, D. A simple and rapid test for differentiation o aerobic and anaerobic bacteria.
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