CH 8 - Energy, Enzymes, and Metabolism

Question 1

What is “Energy Coupling”?

Answer 1

energy production rxs of catabolism are used to drive the energy requiring rxs of anabolism

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Question 13

What is the best description of Gibb’s Free Energy (Biological)?

Answer 13

The portion of a system’s energy that is able to perform work when T is uniform throughout system; symbolized by “G”

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Question 20

In reference to reactions in closed systems, what is one of the defining characteristics of life?

Answer 20

Metabolic dis-equilibrium
G cannot = 0 otherwise that means the cell is dead

Question 21

Cellular respiration is endergonic or exergonic?

Answer 21

Exergonic: releases approximately 686 kcal

Question 22

Photosynthesis is endergonic or exergonic?

Answer 22

Steeply endergonic: requires approximately 686 kcal/mol which is acquired from light energy (sunlight)

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Question 25

True or False: Enzymes alter the Gibb’s Free Energy, Activation Energy, and equilibrium of a reaction to increase the reaction rate

Answer 25

False: enzymes only lower the activation energy barrier for reactions

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Question 28

What is the Induced Fit Model?

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