ETC In bacteria?

[wired202808]

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Destroyer says there is no ETC in Bacteria, meanwhile Wikipedia says there is.

Thoughts?

 

[Dental2000]

I would go with destroyer, more reliable source

Bacteria as far as I now are mostly anaerobic(no O2)
ETC requires O2 to occur....

 

[wired202808]

I would go with destroyer, more reliable source

Bacteria as far as I now are mostly anaerobic(no O2)
ETC requires O2 to occur....

nah I was right, he wrote the wrong answer. ETC occurs in Bacteria, google it!

 

[rccostner]

nah I was right, he wrote the wrong answer. ETC occurs in Bacteria, google it!

as far as i understand it bacteria only have glycolysis, fermentation, and ETC for energy sources.

 

[Vsno123]

There is an electron transport chain in bacteria but they use it a bit differently (and if I remember correctly from microbio, it's located on the plasma membrane). Do not forget that bacteria can be aerobes too. Also if you think back to aerobic respiration in humans, we make 36 ATP from substrate and oxidative phosphorylation, where as bacteria make 38 ATP. All NADH in bacteria produce 3 ATP because there is no mitochondrial membrane to go through, whereas in humans, the two NADH from glycolysis only produce 2 ATP during oxidative phosphorylation (due to an intermediate carrier that must be used to bring the e- and energy pass the mitochondrian membrane and into the ETC). <--that was a mouth full, hopefully it made sense

Also if you look on page 348 of the 2011 Destroyer, the answer to #145 even says that they have their own ETC.

 

[Vsno123]

another note: here are some different categories of aerotolerance for bacteria

aerobes - use oxygen..obviously

anaerobes- don't like oxygen (can die in its presence) so use glycolysis/fermentation

facultative anaerobe- uses oxygen when present, but when not present, reverts to anaerobic respiration

aerotolerant anaerobe- can live in the presence of oxygen, but only uses anaerobic respiration/fermentation

as you can see, you can't just strictly assume that most bacteria are anaerobes

 

[RalphMouth]

Anyone know how bacteria can produce 38 ATP if there's no Krebs cycle? I never understood that part of the calculation. How do they produce the FADH2 and other NADH (not from glycolysis) used in ETC? Never understood that part..

 

[yappy]

The way that bacteria, who are doing aerobic metabolism, produce ATP using oxidative level phosphorlation is by means of the electron transport enzymes on their plasma membrane. (remember they are prokarylotes and do not have mitochondrea) Also some use electron acceptors other than oxygen; such as nitrate, sulfate, sulfur.

For anerobic metabolism just remember your NADH oxidation pathways others than krebs & ETC.

 

[rccostner]

Anyone know how bacteria can produce 38 ATP if there's no Krebs cycle? I never understood that part of the calculation. How do they produce the FADH2 and other NADH (not from glycolysis) used in ETC? Never understood that part..

the reactions of the krebs cycle still occur but they happen in the cytoplasm of the bacteria. the point of being able to make 38 vs. 36 was explained above in that they don't have to move the NADH and FADH2 into a mitochondria to continue the process, therefore no energy is lost in moving the intermediates across a membrane.

 

[wired202808]

thanks everyone the choice was written wrong, it was meant to include ETC as part of bacteria's energy production. plus Wikipedia and google confirm it. (not necessarily the same ETC as in eukaryotes but an ETC nonetheless.)