The free energy released by the hydrolysis of ATP under standard conditions is -30.5 kJ/mol.If ATP is hydrolyzed under standard conditions except at pH 5.0, is more or less free energy released? Why?More free energy is released because the increased [H+] stabilizes the negative charge on the ADP molecule.Less free energy is released because an acidic environment depletes cellular ATP levels.Less free energy is released because the reaction favors ATP production over hydrolysis due to the higher [H+]in solution.More free energy is released because the total cellular concentrations of ATP, ADP, and P; are greater at the lowerpH.Correct Answer

ATP hydrolysis is a fundamental biochemical reaction that provides energy for many cellular…

Answered: The free energy released by the…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter2: Cell Physiology

Section: Chapter Questions

Problem 2SQE

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Figure 6.8 Look at each of the processes shown, and decide if it is endergonic or exergonic. In each case, does enthalpy increase or decrease, and does entropy increase or decrease?
PREDICT In the following reaction series, which enzyme(s) is/are most likely to have an allosteric site to which the end product E binds? (a) enzyme 1 (b) enzyme 2 (c) enzyme 3 (d) enzyme 4 (e) enzymes 3 and 4
Which of the following comparisons or contrasts between endergonic and exergonic reactions is false? Endergonic reactions have a positive ?G and exergonic reactions have a negative ?G Endergonic reactions consume energy and exergonic reactions release energy Both endergonic and exergonic reactions require a small amount of energy to overcome an activation barrier Endergonic reactions take place slowly and exergonic reactions take place quickly.
Using the Nernst equation, calculate the equilibrium potential for Ca2 and for C1 from the following sets of data: a. Given [ Ca2+ ]0=1mM,[ Ca2+ ]i=100nM, find Eca2+ b. Given [ Cl- ]0=110mM,[ Cl- ]i=100mM, find Ecl
Energy is stored long-term in the bonds of _____ and used short-term to perform work from a(n)_____molecule. a. ATP : glucose b. an anabolic molecule : catabolic molecule c. glucose: ATP d. a catabolic molecule : anabolic molecule
Figure 4.5 Energy inputs and outputs in chemical reactions. 1 Some reactions convert molecules with lower energy to molecules with higher energy, so they require a net energy input in order to proceed. 2 Other reactions convert molecules with higher energy to molecules with lower energy, so they end with an energy release Figure It Out: Which law of thermodynamics explains energy inputs and outputs in chemical reactions?
Describe the position of the transition state on a vertical energy scale, from low to high, relative to the position of the reactants and products, for both endergonic and exergonic reactions.
Figure 27.3 illustrates the response of R (ATP-regenerating) and U (ATP-utilizing) enzymes to energy charge. a. Would hexokinase be an R enzyme or a U enzyme? Would glutamine: PRPP amidotransferase, the second enzyme in purine biosynthesis, be an R enzyme or a U enzyme? b. If energy charge = 0.5: Is the activity of hexokinase high or low? Is ribose-5-P pyrophosphokinase activity high or low? c. If energy charge = 0.95: Is the activity of hexokinase high or low? Is ribose-5-P pyrophosphokinase activity high or low?
Examine the ActiveModel for alcohol dehydrogenase and describe the structure and function of the catalytic zinc center.
Enzymes _______. a. enhance reaction rates b. are affected by pH c. act on specific substrates d. all of the above
Figure 7.11 Dinitrophenol (DNP) is an "uncoupler" that makes the inner mitochondrial membrane "leaky" to protons. It was used until 1938 as a weight-loss drug. What effect would you expect DNP to have on the change in pH across the inner mitochondrial membrane? Why do you think this might be an effective weight-loss drug?
Both prokaryotic and eukaryotic organisms carry out some form of glycolysis. How does ha fact support or not support the assertion that glycolysis is one of the oldest metabolic pathways?

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