Energy Production In Biochemical Pathways - Video Tutorials & Practice Problems
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concept
Energy Production In Biochemical Pathways Concept 1
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Video transcript
Hey, everyone. So here we can say that biochemical systems most commonly employ two methods to produce energy. Now, in the first one, we have oxidation reactions and they produce energy in the form of electron carrier. So we're talking about the production of N A DH and FA DH two. If we take a look here, we have step eight of our citric acid cycle where we have mala being changed into oxy aide. Here we have N ad positive. It's going to gain electrons become N A DH. And through the use of our substrate MLA and our enzyme mala dehydrogenase, we create oxalacetate. Remember when we talk about dehydrogenase as enzymes, we're talking about oxidation reactions over here. This represents step six of our citric acid cycle or we have succinate being changed into fumarate. Again, we're using a dehydrogenase. So this is an oxidation that's occurring in this case though we have F ad becoming fa DH two. Remember F ad to FA DH two will be utilized in order to create a pi bond. In this case, we created a pie bomb between these two carbons which transforms our succinate into fumarate. Now, next, we're gonna say we have what's called cleavage reactions or just simply hydrolysis. So we're gonna have the cleavage or hydrolysis of high energy bonds to release energy stored in them. A great way to look at this is the cleaving of our phosphate bonds in a TP to release energy. So here we have a TP. We include our water. Here, it's going to help break one of these bonds, releasing an inorganic phosphate and in the process, because we're breaking that high energy bond, we're gonna release a TP. So here's the A TP that's released. So just remember when it comes to these biochemical systems, biochemical reactions, there's mainly two major ways to produce energy either through oxidation reactions or through cleavage slash hydrolysis.
2
example
Energy Production In Biochemical Pathways Example 1
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Here it says, identify the following biochemical reaction would use energy or produce energy in this reaction. We have isocitrate plus N ad positive. We're using the enzyme isocitrate dehydrogenase. This creates alpha ketoglutarate carbon dioxide and a DH plus H positive. Now, here we're going to say that we're using a dehydrogenase. Remember this is the enzyme of choice for an oxidation reaction. And we're going to say this is an oxidation reaction because we've produced an A DH remember these N A DH fa DH two productions for these oxidation reactions will make energy. So this is gonna produce energy and this particular reaction itself represents reaction three or step three in the crept cycle or citric acid cycle. OK. So here because we're using a dehydrogenase, this is an oxidation reaction we're making N A DH, which is an electron carrier. This is indicative of a biochemical reaction that's going to produce energy.
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Problem
Problem
Which of the following biochemical reactions would not produce energy?
A
ATP + H2O → ADP + HOPO32− + H+
B
6-phosphogluconate + NADP+ → ribulose-5-phosphate + CO2 + NADPH
C
Pyruvate + NAD+ + HS–CoA → Acetyl CoA + CO2 + NADH
D
Glucose + ATP → glucose-6-phosphate + ADP + H+
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