Which statement best describes the reason why some of the reactions of glycolysiscannot be run in reverse in gluconeogenesis?1)The last reactions occur in mitochondria and reactions there can never bereversed.2) Glycolysis includes isomerization reactions and these can never be reversed.3)There are some allaşteric enzymes and allosteric enzymes can never bereversed.4)Some reactions have such large negative free energy changes that they cannever be reversed under cellular conditions.O

Introduction: Glycolysis and gluconeogenesis are the two processes that are involved in the…

Answered: Which statement best describes the…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Similar questions

Of the 36 molecules of ATP produced by the complete metabolism of glucose, how many are produced directly in glycolysis alone, that is, before the common pathway?
Give all the reversible reactions in glycolysis. Specify the enzymes involved that catalyze each reaction
Explain why some of the molecules are positioned away from the diagonal in the graph given below. What kind of processes are involved in this phenomenon? Moreover, explain differences and similarities between H-ATPases and H-PPases.
Indicate at what step in the glycolysis pathway each of the following events occur 1. First phosphorylation of ADP occurs 2. First “energy rich” compound is produced 3. Second “energy rich” compound undergoes reaction 4. First isomerization reaction occurs 5. Second formation of ATP occurs 6. Second “energy rich” compound is produced 7. ATP is converted to ADP for the second time 8. A dehydration reaction occurs
The following image is a schematic of the metabolic processes occurring in a plant contained in a closed container. A=Light Dependent reactions B=Glycolysis C=Light Independent Reactions D=Kreb's cycle E=electron transport chain 2a) Use the figure above to explain the conditions in which the oxygen concentration remains constant in the container. b) 2-carboxyarabinitol-1,5-bisphosphate (CABP) is an inhibitor of the enzyme rubisco. Which pathway would this affect most?
Explain the origin of the word glycolysis and why this is anappropriate name for the function of that reaction pathway.
Explain why gluconeogenesis is not the mere reversal of glycolysis. Give at least 3 reasons to support your answer. The answer must include the terms; endergonic, exergonic, reciprocal regulation, and futile cycle.
Which of the following events does not occur during Krebs Cycle? Citrate synthase catalyzers the transfer of an acetyl group from acetyl coenzyme A to oxaloacetate to form citrate. Isocitrate dehydrogenase converts citrate to its isomer isocitrate. A carbon dioxide is released when alpha-ketoglutarate is oxidized to succinyl coenzyme A. The energy released from the conversion of succinyl coenzyme A to succinate is used to transfer a phosphate group to ADP to form ATP. During Krebs Cycle, succinate is oxidized to fumarate which is coupled to the reduction of FAD to FADH2. During electron transport, the electrons from FADH2 are transferred to coenzyme Q. Which of the following catalyzes these reactions? NADH dehydrogenase Succinate dehydrogenase FADH2 hydrogenase NADH hydrogenase reductase
3-Phosphoglycerate is a metabolite in glycolysis. Which glycolytic enzyme generates this metabolite?
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. What two enzymes in glycolysis are regulated by high ATP concentrations? Write out the substrates, products and enzyme involved for the two ATP producing steps in glycolysis. What bonds are cleaved in fructose-1,6-bisphosphate to form dihydroxyacetone phosphate and glyceraldehyde-3-phosphate? Phosphates are added to glucose in two separate steps to produce fructose-1,6- bisphosphate. (a) Which position ends up on the 3 C-product that is used for ATP production? (b) What is the function of the phosphate on the other carbon? What molecule acts as an oxidizing agent in glycolysis? When fructose is the carbon source what carbon is phosphorylated? What 3-carbon phosphorylated product results from aldolase B? Under anaerobic conditions what is the fate of pyruvate? What product of pyruvate is used to form citrate in the TCA cycle? Write out the substrates, products and enzymes responsible for the three steps oxidizing the original carbon skeleton of…
For each of the descriptions below, put a check mark in the column(s) for any pathway the statement describes. Note that some descriptions may have multiple pathways that match. You will need to mark 22 boxes-no more 7. and no less. Glycolysis Krebs ETC & Gluconeo- genesis Glyco- genesis Glycogen- olysis PPP Ox Phos Description Example: Name contains a G Occurs in the cytosol Flux may increase in liver during intense exercise Has different isozymes in liver versus muscle Contains one or more near to equilibrium reactions Requires FAD Requires UTP availability Involves a decarboxylation step Produces reducing power for the cell Generates 14C-CO, from 3-14C- glucose
The coenzymes NAD+ and NADP+ are important electron carriers that pick up electrons from one pathway and deliver them to another. Below is a list of pathways or enzyme complexes that we have covered in class. Indicate which coenzyme these pathways or complexes produce by writing NAD+, NADP+, NADH or NADPH in the blank provided. ________ glycolysis ________ citric acid cycle ________ alcoholic fermentation ________ pyruvate dehydrogenase complex ________ gluconeogenesis ________ mitochondrial electron transport ________ photosynthesis light reactions ________ photosynthesis dark reactions

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