3. Instead of fermentation some facultative anaerobes have ETS systems for both

Question

3. Instead of fermentation some facultative anaerobes have ETS systems for both aerobic respiration and anaerobic respiration. What is the key difference between these ETS systems? b. What is the key difference between organisms that uses anaerobic respiration compared to one that uses fermentation in the absence of oxygen? 4. Classify the following microbes based on their metabolic description (include as many descriptors in the classification as possible based on the information provided). • An organism that contains photosystems for absorption of light energy and is able to perform carbon fixation. • An organism with an electron transport system that uses nitrite as an electron donor and iron as the electron acceptor. • An organism that uses fermentation for energy and is NOT able to perform carbon fixation. 5. Many chemotrophs and phototrophs contain an ETS which functions very similarly. Describe the basic steps of how an ETS functions. 8:55 AM instructure-uploads-2.s3.amazonaws.com ·'11 Verizon? absence? 3. Instead of fermentation some facultative anacrobes have ETS systems for both acrobic respiration and anaerobic respiration. What is the key difference between these ETS systems? b. What is the key difference between organisms that uses anaerobic respiration compared to one that uses fermentation in the absence of oxygen? 4. Classify the following microbes based on their metabolic description (include as many descriptors in the classification as possible based on the information provided). An organism that contains photosystems for absorption of light energy and is able to perform carbon fixation. An organism with an electron transport system that uses nitrite as an electron donor and iron as the electron acceptor. An organism that uses fermentation for energy and is NOT able to perform carbon fixation 5. Many chemotrophs and phototrophs contain an ETS which functions very similarly. Describe the basic steps of how an ETS functions.

Explanation / Answer

Ans. The key difference between these two systems are the use of oxygen as terminal electron acceptor. In case of aerobic respiration the terminal electron acceptor function is carried out by oxygen whereas on the contrary anaerobic respiration is carried out by utilising other substrates such as sulfate, nitrates or other compounds such as fumarate. Ions cross cell membrane by oxidative nergy imparted by ATP and in case of anaerobic the ionic diffusion occurs by osmosis.

Ans. The key difference between the two sysatems is the amount of energy utilised and produced. In case of aerobic respiration oxygen is utilised and more ATP molecules are produced whereas in case of anaerobic lesser amount of energy is produced due to the absence of oxygen.

Ans i. Cyanobacteria and proteobacteria are the class of bacteria which contain photosystem for absorption of light energy and fixation of carbon.

Ans ii. Autotrophs and heterotrophs are the class of organism which use nitrite as electron donor and iron as electron acceptor.

Ans iii. Organisms which uses fermentation for energy and not able to perform carbon fixation are known homofermenter bacteria.

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