Why is glucose phosphorylated to become glucose-6-phosphate? Group of answer choices to isomerize it to glucose 1 phosphate to activate the enzyme hexokinase to trap glucose inside the cell and commit it to the pathway to form bisphosphate molecules
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Why is glucose phosphorylated to become glucose-6-phosphate?
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- Glycogen is the main storage form of glucose in animals. Why is glucose necessary as opposed to simply keeping a high concentration of intracellular glucose ready for when the cell needs energy? O Free glucose is cytotoxic Glycogen has the highest energy capacity of any organic compound To maintain osmotic balance O Glucose precipitates out of solution in cellular conditions O None of the above i Question 26 Suppose you incubated a sample of glycogen with debranching enzyme, transferase, orthophosphate and glycogen phosphorylase. What would be the approximate ratios of G1P to Glucose (G1P/Glucose)? O Not enough information O 10 O 100 25The proton channel of ATP synthase consists of: 8–14 pairs of α helices. 8–14 a subunits. 7 α helices. 8–14 α helices. 8–14 half-channels.Loss of this enzyme would be lethal to the cell CH₂-CH-CH₂ OH OH Glycerol- phosphate Loss of this enzyme would severely reduce the exchange of lipids between the cytosol and lumen P CH₂-CH-CH₂ O O I =C C=O Loss of this enzyme would lead to membrane phospholipids with identical phosphate head groups Phosphatase Acyl transferase Loss of this enzyme would result in membranes deficient in phosphatidylcholine Choline head Cytosol group ER lumen Choline phosphotransferase Loss of these enzymes would prevent lipid transfer between the ER and mitochondria Flippase lipid exchange proteins
- A medical student was studying the effect of glucose oxidase on glucose and fructose metabolism. He noticed the affect only with the glucose and no effect with fructose. Which ONE of the following property would explain his Indings? DStereo or optical specificity OBond specificity OAbsolute specificity OReaction specificity Group specificityWhich of the following conditions will produce active glycogen phosphorylase? AMP АТР Phosphorylation of Serine 14 Glucose Glucose-6-Phosphate Phosphorylation of Serine 14 and AMP Phosphorylation of Serine 14 and ATPWhich steps are part of the energy investing half of glycolysis? OPhosphorylation Isomerization Second Phosphorylation Cleavage Conversion of DHAP into GADP O Dephosphorylation Phosphate transfer O Dehydration Second dehydration
- An enzyme that catalyzes a reaction such as the one below is alan: || C-0 || C-0 C=0 С —о — Н I| Н-С—Н H- C H H isomerase O kinase O dehydratase O dehydrogenase O phosphorylase O - IWhich steps are part of the energy investing half of glycolysis? Phosphorylation Isomerization Second Phosphorylation O Cleavage Conversion of DHAP into GADP ODephosphorylation U Phosphate transfer Dehydration Second dehydrationWhich reaction is most likely to have a positive value for ∆G? Synthesis of a polymer from monomers Hydrolysis of ATP Ã ADP Payoff phase of glycolysis Diffusion of ions from high to low concentration
- CH₂OH 애 H2COPO 2- ATP OH 1 애 애 어 애 The class of the enzyme catalyzing the reaction shown in this figure is a(n) Choose the one best answer. ligase 매 +ADP 매Glucose transporter (GLUT) isoforms move glucose in and out of the cell GLUTS respond to the glucose equilibrium concentrations. Use your knowledge of enzyme catalysis and lonetics to predict which of the following correctly rank the steps in glucose transport by GLUT1? 1. Glucose binding results in a conformational change, opening the binding site on the opposite side of the membrane 11. Glucose binds to the transporter on one side of the membrane II. The transporter reverts to initial conformation IV. The glucose disassociates OA III, IV, III OB. 1,1,1, IV OCIV, II, II, I ODII, IV III OENI, LIymes change their conformation after each reaction, therefore they can only be used once. OEnzymes can be proteins that can be denatured by changes in pH or temperature. D Question 37 A major difference between purine and pyrimidine biosynthesis is that pyrimidine: O are attached to the ribose sugar while being synthesized O are completely synthesized prior to attaching to the ribose sugar O are partially synthesized, the sugar is added, then synthesis is completed O do not have a sugar moiety Question 38 Which of the following is produced in largest numbers by the TCA cycle?