Question 37 the following c2 co2 h e represents a krebs...

QUESTION 37 The following (C2 → CO2 + H+ + e-) represents A. Krebs cycle. B. glycolysis. C. electron transport system. D. preparatory reaction. QUESTION 38 When ATP is made during the Krebs cycle, it is by ______. A. chemiosmosis B. photophosphorylation C. oxidative phosphorylation D. substrate-level ATP synthesis QUESTION 39 The cyclic electron flow that occurs via photosystem I produces A. oxygen. B. ATP. C. NADPH. D. All of the above. QUESTION 40 One common feature of electron carriers such as NAD+ is that: A. they gain electrons when they are oxidized. B. they all contain iron to attract the electrons C. they can be reversibly oxidized and reduced. D. they all use FAD as an intermediate.

Transcript

00:01 Okay, in order to answer this question, let's talk about metabolism.

00:03 Question number 13 says the following, and you have this reaction here, where you produce carbon dioxide, hydrogen ion, and also electrons represent.

00:14 And the answer here is going to be option a, that is the curve cycle, because in the curve cycle, you're going to start with an acetylchalcote molecule, and it is going to react with oxaloacetyate, and you're going to produce citrate.

00:25 Then you're going to produce isocytic, arthritis, succinate, fulcate, malate, and then oxalo acid again.

00:31 Okay, but during this reactions here, specifically three steps you're going to produce, 3 in adh, 1 fadh2, and 1802, and these two molecules here are electron carriers.

00:45 Okay, also here you're going to produce an adh plus 1 hydrotrotite ion.

00:48 So, in your particular producing phyodorin electrons and also in two steps that are catalyzed by the enzyme isosidrate dehydrogenase and after kilo glutrate dehydrogenase, they're going to produce carbon dioxide molecules.

01:03 So practically this is why option a that says a crept cycle is the answer for question number 13.

01:09 Then we have the next question that says when atp is made during the crept cycle, it is by, well, remember that at one step here specifically from saccinal coa to saksinate, you're going to produce 1 atp directly.

01:28 Directly it means by means of the enzyme that catalyzes a reaction from sassinal coate to saccinate okay this this type of atp synthesis is different from the atp that is produced by these electron carriers because they need to transfer these electrons to the electron chain and then via oxidative of feralation you're going to produce atp but this is different because you have to unload these electrons to the electron transfer chain and so on okay but in the curve cycle you're producing atp without a requirement of this it means only by means of and types and this is called substrate levels of correlation okay so the answer for question for this question 38 is going to be option the substrate level atp synthesis okay now let's go for question 39 it says the cyclic electron flow that occurs via for a system one produces and the answer here is going to be option b atp okay this is like practically the what you're going to produce because of the cyclic electron flow that occurs via follow system quo.

02:32 Then we have a question for 40 that says one common feature of electron calories such as nad plus is that option a says they gain electrons when they are oxidized.

02:45 And this is false because we are going to gain electrons when they are reduced...

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