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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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 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.
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
The following reaction takes place during the synthesis of glycogen: Glucose 1-phosphate + UTP + H20 UDP-Glucose + 2Pi This reaction may be best described as a: a. exergonic, catabolic reaction O b. exergonic, coupled reaction C. oxidation-reduction reaction d. endergonic, substrate-level phosphorylation reaction e. exergonic, substrate-level phosphorylation reaction
A cell is grown on minimal media containing only glyceraldehyde 3-phosphate as a source of carbon and energy. What is the most likely place this compound would enter the metabolic cycle? Group of answer choices Glycolysis Conversion of Pyruvate to Acetyl-CoA The TCA Cycle The Electron Transport Chain
Other than oxidative phosphorylation, what other metabolic pathway does "Complex 2" participate in? 1. Glycolysis 2. Gluconeogenesis 3. Lactic acid fermentation 4. Citric acid cycle
Nearly all of the energy used by living cells comes from the energy in the bonds of the sugar glucose. As glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells, it is probably one of the earlier metabolic pathways to evolve since it is used by nearly all the organisms on Earth. As discussed, why are coupled reactions important in the process of glycolysis?
The functioning of a particular pathway often depends not only on control enzymes in that pathway but alsoon control enzymes of other pathways. What happens in the following pathways under the indicated conditions? Suggest what otherpathway or pathways might be influenced.(a) High ATP or NADH concentration and the citric acid cycle.(b) High ATP concentration and glycolysis.(c) High NADPH concentration and the pentose phosphate pathway.(d) High fructose-2,6-bisphosphate concentration and gluconeo genesis.
Some cofactors that participate in the reactions of the citric acid cycle are indicated by letters. Identify the position of positions of NADH in the cycle by selecting the appropriate letter or letters designating its position(s) in the cycle diagram. COA CH, HO--Co, CH čo, 8 CO но-сн CH HC -Co, CO HO-CH LA Citric acid cycle H,0 co, -B COA | 4 Co, čo D.
Which of the 10 reactions of glycolysis are (a) phosphorylations, (b) isomerizations, (c) oxidation–reductions, (d) dehydrations, and (e) carbon–carbon bond cleavages?

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