7 ATP is a source of free energy that drives unfavorable reactions.Which of the processes are coupled to the dephosphorylation of ATP?membrane transport that maintains Na+ levels in cellsreversible isomerization of glucose-6-phosphate to fructose-6-phosphate during glucose catabolismthe exergonic hydrolysis of creatine phosphatemyosin action during muscle contractionde novo (from scratch) anabolism of nucleotidesIncorrectOne reason that ATP is a source of energy is that the products of ATP hydrolysis have less free energy than the reactants.Why?electrostatic repulsion in ATPresonance stabilization of free phosphatehydrogen bonding between free phosphate and waterformation of ion pairs involving ATPIncorrect

The structure of ATP comprises of a nucleoside triphosphate, consisting of a nitrogenous base…

Answered: Which of the processes are coupled to…

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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ATP is a source of free energy that drives unfavorable reactions. Which of the processes are coupled to the dephosphorylation of ATP? ion transport with the concentration gradient reversible isomerization of glucose-6-phosphate to fructose-6-phosphate during glucose catabolism the endergonic reaction forming glucose-6-phosphate myosin action during muscle contraction de novo (from scratch) anabolism of nucleotides One reason that ATP is a source of energy is that the products of ATP hydrolysis have less free energy than the reactants. Why? formation of ion pairs involving ATP hydrogen bonding between free phosphate and water resonance stabilization of free phosphate electrostatic repulsion in ATP
Which of the following processes would be directly affected by the presence of a non-hydrolyzable form of ATP ? the depolymerization of tubulin monomers O the depolymerization of actin monomers the polymerization of tubulin monomers the polymerization of actin monomers
Match the following molecules with their functions. Molecules CAMP Protein kinase A Glycogen phosphorylase Phosphoglucomutase Functions Converts glucose 1-P to glucose 6-P Phosphorylates a substrate using an inorganic phosphate Second messenger that can activate downstream proteins Phosphorylates a protein using ATP
Which enzyme activity of the glycogen debranching enzyme is operating during the release of glucose units linked to glycogen branchpoints via a1,6 glycosidic linkage? phosphatase activity phosphorylase activity glucosidase activity transferase activity
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
Which 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
iodoacetate is an irreversible inhibitor of glyceraldehyde-3-phosphate dehydrogenase. which of the following is the expected outcome of the exposure of a cell to iodoacetate - Cellular resiration will stop if the cell solely depends on glucose as fuel - The rate of cellular respiration will increase - The reoxidation of coenzymes will noy be affected , but the efficiency of oxidative phosphorylation will be diminished - There will be no effect on cellular respiration as long as the cell has a large glucose reserve -The cell sill not be able to reoxidize the reduced coenzymes
Several of the enzymes of glycolysis fall into classes that often occurs in metabolism. Describe ONLY ONE reaction types are catalzed by each of the following. Kinases
Which of the following biochemical reactions should be classified as endergonic (endothermic)? conversion of glucose into amylopectin conversion of lactose into glucose and galactose conversion of glycogen into glucose conversion of sucrose into glucose and fructose conversion of amylose into glucose
Which of the following statements is FALSE regarding oxidative phosphorylation? The pH is higher in the matrix relative to that in the inter-membrane space. A large positive difference in reduction potential is associated with a small negative free energy change. Electrons from FADH2 enter at complex II because the reduction potential of FADH2 is greater than that of redox centers in complex I. Oxidation and phosphorylation are coupled via a proton gradient.
What type of enzyme is responsible for initiating the process of glycolysis? O Hydrolase O Phosphorylase O Kinase O Phosphatase
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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