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Which of the following could be an example of a reaction in the chemical equilibrium of a cell?



A. A reaction in which the free energy at equilibrium is higher than the energy content at any point away from equilibrium
B. A chemical reaction in which the entropy change in the reaction is just balanced by an opposite entropy change in the cell s surroundings
C. An endergonic reaction in an active metabolic pathway where the energy for that reaction is supplied only by heat from the environment
D. A chemical reaction in which both the reactants and products are only used in a metabolic pathway that is completely inactive
E. There is no possibility of having chemical equilibrium in any living cell.

This question is part of Chapter 8 Test - AP Biology
Asked by Muitran, Last updated: Jan 12, 2020

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3 Answers

R. Glover

R. Glover, Editor, New York City

Answered Oct 04, 2018

The answer to this is D. Take note that cells may encounter different reactions depending on what it is being exposed to. Chemical reactions are common as well. There are even times when it will be going through different reactions all at the same time. Cells that are in a state of equilibrium may react differently.

The reactants and the products will still be available in the metabolic pathway but this time, they will not be active. Take note that they will only appear this way because the product and substrate will be the same or equal to each other which means that no reaction will take place.

 

Anonymous

Anonymous

Answered Jan 17, 2018

A cell has many chemical reactions occurring simultaneously. The metabolism is always at work and is driven by these chemical reactions. However, in a state of equilibrium the substrates and reactants are in a specific ratio without any changes. In other words it can be said that a chemical reaction in equilibrium is one in which the reactants and products in a metabolic pathway are both used in a metabolic pathway, which is in fact inactive.

Although, in reality this means that the rate of substrate and products interconverting into one another is equal, which gives the impression as if nothing is happening and the pathway is inactive.

 

John Smith

John Smith

Answered Dec 13, 2016

A chemical reaction in which both the reactants and products are only used in a metabolic pathway that is completely inactive
 

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