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Metabolic reaction

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1.;What does?G of a metabolic reaction measure?;the net change in free energy during a reaction;the amount of heat energy gained or lost in a reaction;the amount of matter transferred in a reaction;the change in activation energy required in a reaction due to enzyme activity;the activation energy of a reaction;2.;Which of the following does a catalyst change during a chemical reaction?;the free energy of the products;heat;entropy;activation energy;the free energy of the reactants;3.;ATP is not the only molecule that can drive reactions. When ATP is depleted during exercise, muscle cells use phosphocreatine to drive the regeneration of ATP.;Consider the following half reactions;1. ATP + H2O? ADP + Pi;?G = ?7.3 kcal/mol;2. Phosphocreatine + H2O? creatine + Pi;?G = ?10.3 kcal/mol;From these two reactions, calculate the Gibbs free energy of the following coupled reaction, catalyzed by creatine kinase;Phosphocreatine + ADP? ATP + creatine;?G =?;Which is the correct net Gibbs free energy of the reaction?;?G = ?3 kcal/mol;?G = ?17.6 kcal/mol;?G = 0 kcal/mol;?G = +3 kcal/mol;?G = +17.6 kcal/mol;4.;Which source of energy does active transport use?;the regeneration of ATP bound to an active transport pump;the hydrolysis of ATP bound to an active transport pump;the hydrolysis of GTP bound to the active transport pump;the transport of ATP bound to an active transport pump;the transport of GTP bound to an active transport pump;5.;Which is an anabolic process?;protein synthesis;glycolysis;ATP hydrolysis;protein degradation;active transport;6.;The sodium-potassium pump is an active transport pump that uses energy to pump potassium into cells and sodium out of cells. Why is ATP energy required?;to change the shape of the ions;to transfer glucose in the same direction as Na+ ions;to pump the Na+ and K+ ions along their diffusion gradient;to pump the Na+ and K+ ions against their diffusion gradient;for the membrane to change shape;7.;Which definition best describes a cell's metabolism?;the chemical reactions that break down glucose for energy;the use of ATP as an energy carrier;the energy level that must be overcome for a chemical reaction to move forward;the burning of fat molecules for energy;the sum of all the chemical reactions occurring in an organism;8.;Which reaction can provide the energy needed to run an endergonic reaction?;protein synthesis;photosynthesis;ATP hydrolysis;enzyme catalysis;All answers are correct.;9.;Which process(es) can directly amplify signals in a transduction pathway?;activating adenylyl cyclase;activating kinases;activating phosphatases;activating phospholipase C;All answers are correct.;10.;What happens when protein kinase A (PKA) phosphorylates phosphorylase kinase in the epinephrine signal transduction pathway?;Phosphorylase kinase becomes deactivated, and glucose production is suppressed.;Phosphorylase kinase becomes activated, and glucose production is suppressed.;Phosphorylase kinase becomes deactivated, and glucose production is enhanced.;Phosphorylase kinase becomes activated, and glucose production is enhanced.;None of the answers are correct.;11.;Which is a catabolic process?;glycolysis;ATP synthesis;ion transport;photosynthesis;translation of mRNA into protein;12.;Which reaction does a kinase catalyze in a signal transduction pathway?;binding of a signal molecule to a receptor;production of cAMP;phosphorylation of a target protein

 

Paper#15097 | Written in 18-Jul-2015

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