Each of the following enzymes are similar in that they are all regulation points for the pathway/cycle they operate in ... except for one enzyme. Which of the following is not a regulated enzyme? CPyruvate carboxylase Transketolase C Glycogen phosphorylase C Citrate Synthase Phosphofructokinase Acetyl CoA carboxylase

Each of the following enzymes are similar in that they are all regulation points for the pathway/cycle they operate in ... except for one enzyme. Which of the following is not a regulated enzyme? CPyruvate carboxylase Transketolase C Glycogen phosphorylase C Citrate Synthase Phosphofructokinase Acetyl CoA carboxylase

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter19: The Tricarboxylic Acid Cycle

Section: Chapter Questions

Problem 22P: Study Figure 19.18 and decide which of the following statements is false. Pyruvate dehydrogenase is...

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Which of the following is a negative regulator of the pyruvate dehydrogenase complex (PDC)? 1. acetyl CoA 2. ADP 3. pyruvate 4. citrate
Which of the following catalyzes a step that does NOT produce CO2? Group of answer choices alpha-ketoglutarate dehydrogenase complex malate dehydrogenase pyruvate dehydrogenase complex isocitrate dehydrogenase Citrate synthase is regulated by... Group of answer choices Concentrations of substrate and products Fructose-2,6-Bisphosphate Covalent modification Allosteric regulation by the levels of NADDH
Which of the following is NOT a component of the pyruvate dehydrogenase complex? a. dihydrolipoyl dehydrogenase b. dihydrolipoyl transacetylase c. pyruvate dehydrogenase d. dihydrolipoyl catalase
Most defects in pyruvate dehydrogenase complex are due to mutations in ______, so supplements with ______ are given. E2 and TPP E1 and lipoamide E3 and NAD+ E2 and lipoamide E1 and TPP
Complete the following description of the mechanism of the pyruvate dehydrogenase complex by using words provided. Not all words will be used. Each word will be used only one time. Three enzymes of the pyruvate dehydrogenase complex work together to catalyze the production of Acetyl CoA from Pyruvate. First, a 2-carbon unit composed of Carbons # ____ and ____ of Pyruvate are added to the co-enzyme ______ and whereas Carbon # ______ leaves as CO. The C-2 unit together with the co-enzyme is called ______ .The C-2 unit is then transferred to the 2nd co-enzyme ____, which is initially in it ___ state. The enzyme that catalyzes this step is ______.From here, the C-2 unit is transferred to form a _____ linkage with CoA-SH to generate_____
In the last step of glycolysis, phosphoenolpyruvate (PEP) is converted to pyruvate and during this reaction ATP is synthesized. Based on the fact that ATP is synthesized, which of the following enzymes would most likely catalyze this reaction? a. enolase b. pyruvate kinase c. aldolase d. pyruvate isomerase e. pyruvate dehydrogenase
Which of the following is NOT a metabolic fate of pyruvate? The pyruvate dehydrogenase complex catalyzes the oxidative decarboxylation of pyruvate to form acetyl-CoA. Pyruvate carboxylase catalyzes the carboxylation of pyruvate to form oxaloacetate. Pyruvate kinase catalyzes the formation of phosphoenolpyruvate from pyruvate. Lactate dehydrogenase catalyzes the formation of lactate from pyruvate.
Complete the following description of the mechanism of the pyruvate dehydrogenase complex by using words provided. Not all words will be used. Each word will be used only one time. 5 Three enzymes of the pyruvate dehydrogenase complex work together to catalyze the production of Acetyl CoA from Pyruvate. First, a 2-carbon unit composed of Carbons # Pyruvate are added to the co-enzyme and whereas Carbon # of leaves as CO» The C-2 unit together with the co-enzyme is called transferred to the 2nd co-enzyme 11 12 The C-2 unit is then which is initially in its state. The enzyme that catalyzes this step is From here, the C-2 unit is transferred to form a linkage with CoA-SH to generate Acetyl COA Oxidized Hydroxyethyl TPP Phosphodiester Reduced Hydroxypropiony! TPP Lipoamide E-1 NADH 3 Dihydrolipoyl dehydrogenase Thioester 2 HydroxyacetyITPp Dihydropipoyl Transacetylase Type the words in the correct order separated by commas. Example: 1, 3, E-1, Thioester, Lipoamide ...
Explain the advantage to the cell of each of the following regulatory actions: a. The pyruvate dehydrogenase complex (PDC) is inhibited by ATP.b. Isocitrate dehydrogenase is stimulated by ADP.c. Pyruvate carboxylase is stimulated by acetyl-CoA.d. Citrate synthase is inhibited by NADH.e. PDC is inhibited by fatty acids
Which of the following glycolytic enzymes catalyzes the conversion of fructose-1,6-bisphosphate into the two product molecules dihydroxyacetone phosphate, and glyceraldehyde-3-phosphate? phosphoglycerate kinase pyruvate kinase malate dehydrogenase aldolase phosphofructokinase
Below are some statements about the TCA Cycle. Which statement is true based on what we have learned in the class? Question 16 options: Oxaloacetate can be replenished from pyruvate carboxylation catalyzed by pyruvate carboxylase. The catabolism of proteins can only feed into the TCA cycle at one point, which is Acetyl-CoA. Acetyl-CoA has transporter proteins and can be transported directly from matrix to cytoplasm (for fatty acid synthesis). In TCA cycle, both Acetyl-CoA and Succinyl-CoA hydrolysis reactions are coupled with ATP/GTP synthesis.
Which of the following is most likely to cause accumulation of acetyl CoA? Group of answer choices There is not enough oxaloacetate present to run the citric acid cycle Increase activity of pyruvate dehydrogenase kinase Increased fatty acid synthesis Increased citrate synthase activity When fluoroacetate (an analog of acetate) is added to the mitochondria, it causes build up of fluorocitrate. Which of the following is most likely to be true? Group of answer choices Fluoroacetate cannot be converted to fluoroacetyl CoA Fluoroacetyl CoA cannot be combined with oxaloacetate to enter the citric acid cycle Addition of fluoroacetate will cause an increase in isocitrate Aconitase cannot use fluorocitrate as a substrate