Which process is common to both aerobic and anaerobic organisms?

[DenTony11235]

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A) Krebs cycle
B) Fermentation
C) Glycolysis
D) ETC
E) All of these

Pretty sure all these processes are common to both aerboic/anaerobic. But, why's destroyer say that Glycolysis is common to all, C.

???

 

[Ferneezy]

believe it or not i got that exact question on the DAT today, but with one key change that made it easier for me to answer. i also answered glycolysis.

 

[aqz]

Krebs and ETC is aerobic. Fermentation is anaerobic. Glycolysis is both.

 

[AM4EVA]

A) Krebs cycle
B) Fermentation
C) Glycolysis
D) ETC
E) All of these

Pretty sure all these processes are common to both aerboic/anaerobic. But, why's destroyer say that Glycolysis is common to all, C.

???

ETC is common to anaerobes???? Really?

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[DenTony11235]

ETC is common to anaerobes???? Really?

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Yes. There are nitrifying bacteria and sulfur reducers. They are anaerobic and use nitrate and sulfur as final electron acceptors in the ETC.

As far as fermentation, we are aerobes and we undergo fermentation.

Maybe my problem is I'm thinking too deep... But that is a scarily worded question, hopefully the DAT is a little more clear.

 

[ekephant]

I think the key here is that the process nitrifying bacteria and sulfer reducers use is SIMILAR to ETC in that it uses a process where electrons move from one carrier to another to produce energy, but the ETC that we know and study in cellular respiration uses oxygen as its final electron accepter. Just my two cents.

 

[Ferneezy]

I think the key here is that the process nitrifying bacteria and sulfer reducers use is SIMILAR to ETC in that it uses a process where electrons move from one carrier to another to produce energy, but the ETC that we know and study in cellular respiration uses oxygen as its final electron accepter. Just my two cents.

pretty much the rationale i used when answering that question: which stipulated "respiration" and not "organisms".

from that i assumed the vantage point of our physiology to get the answer, thus:

glycolysis is utilized in aerobic and anaerobic respiration. ETC isn't used in anaerobic respiration. the purpose of anaerobic respiration is to generate NAD+ to fuel glycolysis

 

[DenTony11235]

Whatever ill just pray that this question doesn't come up on my dat and if it does hopefully it'll be worded exactly the same so I just pick glycolysis

 

[Dotoday]

The answer is correct because in order to go through TCA cycke, you need to go through Glycolysis to produce Pyruvate, which is then converted to AcetylCoA, which enters Krebs cycle. Some cells, like red blood cells, do not have mitochondria and therefore have no Krebs cycle. However, if you have mitochondria, you also have use Glycolysis, because it occurs in cytosol. Hope this helps.

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[Waheguru]

DenTony11235,
The last 3 replies have been on target. My intent is to clarify and put it all together. First, do not worry about the nitrifying bacteria and sulfur reducers.
Its important to know that Glycolysis is the breakdown of Glucose (sugar). In this breakdown, energy is harnessed by the electron carrier NAD+, when it is reduced to NADH. For the process of Glycolysis to be repeated, this energy carrier must donate its electrons so that it may return to its oxidized form, NAD+.
This involves the processes, Fermentation ( an anaeroboic pathway, meaning oxygen is not required) and the Citric Acid Cycle and ETC ( an aerobic pathway in which oxygen is required).
In fermentation, the NADH is recycled back to NAD+. This occurs when oxygen is not present.
When oxygen is present, however, we proceed to the Citric Acid Cycle and the electron transport chain. As mentioned by Dotoday, acetyl CoA is the starting point for the Krebs cycle. In order to convert pyruvate (product of Glycolysis) to acetyl CoA, we need to generate NAD+. Having produced 2 molecules of NADH from the breakdown of Glucose in Glycolysis, NADH donates its electrons to the ETC, where Oxygen is the final electron acceptor. The fact that oxygen needs to accept these electrons makes this an aerobic pathway.
To sum up, the citric acid cycle and the ETC require oxygen, causing aerobic organisms to undergo these processes. On the other hand, Fermentation is a process that only anaerobic organisms undergo. Glycolysis, however, is undergone by both aerobic and anaerobic organisms since both types need to break down sugar to harness energy.

 

[DenTony11235]

Thanks guys, i appreciate the effort put into writing the responses, however im not entirely convinced. Thanks anyway tho