Which of the following does not occur during the Calvin cycle?
a....

Question

Which of the following does not occur during the Calvin cycle?
a. carbon fixation
b. oxidation of NADPH
c. consumption of ATP
d. release of oxygen

Accepted Answer

Welcome back. Let's look at our next question. It says the Calvin cycle should go through which of the following stages. And as we look at our answer choices. We see it's different orders of car box elation, regeneration and reduction as the three different stages. So let's recall from our content video. We'll just put up a little diagram of the steps of our Calvin cycle. So when we look at the first area here, we see carbon dioxide coming in, it's combined with the five carbon are ubp by the enzyme. Disco makes a brief six carbon intermediate and then goes to the 23 carbon molecules of three phosphate glass rate. So at this stage we've got CO two in the atmosphere, it's a gas and it's being fixed onto a onto a molecule and then entering the cycle. So this first part here is going to be the carbon fixation step or car box elation. So that will be the first part here. So we want to look for our answer choices that have car box elation as the first step. And we see that Choice A. And Choice D. B, and C. Have car box elation in the middle, which is not correct. So we're going to cross those out. Now let's look at our second part here as we go along in the cycle, we now have that three carbon, three phosphate glass rate and it is going to be reduced 80 P and n 80 ph are going to reduce this into the three carbon sugar glycerol to hide three phosphate. So this stage here is reduction. So we want to see reduction as our second step. So we see that here in Choice D. Choice A. Has regeneration as the second step reduction is third. So we can eliminate choice A. So on a test we go ahead and select choice D. But to be thorough we'll keep going. We're expecting our third step here to be regeneration. And indeed we see we finished. This is now a cycle because after some of our glycerol three phosphate, some of these molecules are gonna go off and be used to make glucose but the rest will keep going and it will be used to regenerate this ruby ru BP molecule that will then participate in the cycle again. So this is regeneration since you've regenerated this original molecule that participates in the first step. So we've confirmed that Choice D. Is correct. The Calvin cycle goes through which the following stages choice de carb oxidation, reduction and regeneration. See you in the next video

Which of the following does not occur during the Calvin cycle? a. carbon fixation b. oxidation of NADPH c. consumption of ATP d. release of oxygen

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