Which of the following conversions would you expect to consume energy and which would you expect to yield energy based on the final oxidation state of the coenzymes involved in each reaction? a. pyruvate → lactate

Hello, everyone. Our next problem says, consider the following conversion pyruvate to lactate. And we have two statements which we have to declare either true or false. Number one, the conversion is expected to yield energy. And number two, the co enzyme involved is in the oxidized state after the reaction. So we need to think about this conversion of pyruvate to lactate. It's part of that process of lactic acid fermentation and it requires the consumption of a molecule of N A DH which becomes N A plus. So our coenzyme is going to be N A DH being that molecule that's required here. And we have to think about what's happening to it. Well, if we think about the fact that N A DH is an electron carrier, so it gives up electrons. Also, we can see that we've gone from neutral to positive. So that indicates that we've lost electrons, let's put lost electrons. And what does it mean to lose electrons in the context of redox reactions? It means that the N A DH was oxidized. So we know looking back at our statements, that statement two, the coenzyme involved is in the oxidized state after the reaction will be true. And then looking at our first statement, the conversion is expected to yield energy. Well, this is overall an exer reaction, we know that the N A DH gave up its high energy electrons to make that proceed. So overall, we're not looking to this conversion to yield energy. The, the yield of energy in the f in the future is when that N AD plus will be used to supply glycolysis allowing a TP generation to continue. So, so statement one is false as this conversion is not expected to yield energy. So our answers here are statements about the conversion from pyrite to lactate. We have number one false, the conversion expected to yield energy. And number two true, the coenzyme involves as an in the oxidized state after the reaction. See you in the next video.