Which one of these pathways would be active in an anaerobic condition? a. glycolysis b. electron

Which one of these pathways would be active in an anaerobic...

Key Concepts

Anaerobic Conditions

Anaerobic conditions are environments where oxygen is absent or present at very low levels. Under these conditions, cells must rely on metabolic pathways that do not require oxygen for energy production.

Glycolysis

Glycolysis is a fundamental metabolic pathway that breaks down glucose into pyruvate and produces small amounts of ATP and NADH. It occurs in the cytoplasm and functions independently of oxygen, making it active during anaerobic conditions.

Fermentation

Fermentation is an anaerobic process that follows glycolysis. It regenerates NAD+ from NADH, which is essential for glycolysis to continue in the absence of oxygen. This pathway allows cells to produce energy when oxygen-dependent processes are inactive.

Aerobic Respiration

Aerobic respiration, which includes the electron transport chain and the citric acid cycle, requires oxygen as the final electron acceptor. These processes are highly efficient in ATP production but are not functional under anaerobic conditions.

Transcript

00:01 So for this question, we are looking at different metabolic pathways.

00:05 And specifically, we are talking about these pathways and how they would operate or function in an anaerobic condition.

00:15 So an aerobic, not anaerobic as saying like a aerobic condition with the correct grammar, but anaerobic.

00:29 So what does anaerobic mean? so aerobic means pertaining to oxygen and then an negates this.

00:40 So it means in the presence of no oxygen.

00:46 So without any oxygen, how can these pathways function? can they function or can they not function? are they active or are they inactive? so let's look at the different pathways we have.

01:01 We have glycolysis.

01:09 We have electron transport.

01:14 Short chain, so the etc, we'll just abbreviate here.

01:20 We have the citric acid cycle, just we will use cac for it, or the krebs cycle, whichever you are more familiar with.

01:31 And then fermentation is answer option d.

01:40 And then i will abbreviate this.

01:43 But then we have e, which is all of the above, all of the, although now it's to the, although left, not above.

01:56 So which of these pathways can function or are active without oxygen? so let's first understand we have a general, the main process we learn about as far as metabolism is cellular respiration and specifically aerobic respiration.

02:17 Right? so aerobic respiration.

02:19 And there are a few different main parts that we learn about with aerobic respiration, which is going to be glycolysis, the citric acid cycle, and electron transport chain.

02:31 So from the first look of things, we need to first identify which of these are active in aerobic respiration that require oxygen.

02:44 So glycolysis doesn't require oxygen.

02:46 This is the first part of respiration.

02:51 Where when there is oxygen present, we will be forming pyruvate as the end product.

02:57 But if it's anaerobic process, we'll just form lactate.

03:02 So it can occur either way, whether you have oxygen or not.

03:07 So glycolysis is a possible answer, but we need to identify the rest of them to see if it's a or e.

03:16 Because if glycolysis is correct, then either it's the only one or all of them are correct.

03:21 That is what we're left with.

03:23 So the electron transport chain and then citric acid cycle.

03:29 So in aerobic respiration, i'll just write aer, in aerobic respiration, oxygen is key for the electron transport chain...

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