Which one of these pathways would not be active in an aerobic condition? a. glycolysis b. electr

Which one of these pathways would not be active in an...

Key Concepts

Electron Transport Chain

The electron transport chain is a series of protein complexes in the inner mitochondrial membrane that use electrons from NADH and FADH2 to create a proton gradient. This gradient drives the production of ATP, making the process highly efficient in the presence of oxygen.

Fermentation

Fermentation is an anaerobic process that occurs when oxygen is not available. It regenerates NAD+ from NADH, allowing glycolysis to continue producing a limited amount of ATP, and is largely inactive under aerobic conditions.

Glycolysis

Glycolysis is the first stage in cellular respiration, where glucose is broken down into pyruvate while generating a small amount of ATP and NADH. This pathway operates in both aerobic and anaerobic conditions.

Aerobic Respiration

Aerobic respiration is a metabolic process that requires oxygen to produce ATP efficiently. It involves a series of pathways such as glycolysis, the citric acid cycle, and the electron transport chain, which together fully oxidize substrates like glucose.

Citric Acid Cycle

The citric acid cycle, also known as the Krebs cycle, takes place in the mitochondria and is a central component of aerobic respiration. It oxidizes acetyl-CoA to produce electron carriers that are subsequently used in the electron transport chain.

Transcript

00:01 Okay.

00:02 So in this question, we are being asked, what process is active during an aerobic condition? and it's basically dealing with the central metabolic pathway in cells, which is basically this.

00:16 You have a glucose molecule, which is carbon molecule, and glucose gets broken down to pyruvate, right, which is a three carbon molecule.

00:33 So it gets broken down to two of these guys.

00:36 Now, pyruvate can either go into fermentation, and this yields some atp, or pyruvate can go on to the citric acid cycle, cycle, and in the citric acid cycle, which basically goes around, and it is a bunch of intermediates, but the main point that you need to get, from the citric acid cycle is that you are taking hydrogens away from these three carbon molecules and you are putting them on an adh.

01:18 Now the nadeh goes on the electron transport chain in the mitochondrial membrane and in the mitochondrial membrane the hes from the nade an edh are split into h pluses and into electron e minuses.

01:41 So basically there are electrons.

01:43 And this proton gradient that gets built up here in the mitochondrial membrane gets used to drive atp synthase and make atp.

01:57 And then at the end, these hydrogens and combined with oxygen to, make h2o.

02:08 So this is where oxygen comes in into this entire picture.

02:15 Okay.

02:16 So basically, an aerobic process is one where oxygen is used.

02:26 So if we follow the arrows, that means that this process right here, this is an aerobic process, right? the path of going from glucose to pyruvate going through the citric acid cycle and all the way down to making atp through this hydrogen or proton gradient and then combining the protons and the electrons with oxygen to make water.

02:57 This is an aerobic process.

03:00 And fermentation, which is another way of making atp, notice that we didn't put any oxygen over here.

03:07 So this is and aerobic.

03:13 So let's look at our answer choices that we have here.

03:16 Which of these pathways would be active in an aerobic condition? would not be active...

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