Chapter 6 Quiz

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When energy released by an exergonic reaction is used to drive an end endergonic reaction

Coupled reaction

The energy that must be added to cause molecules to react with each other

Energy of activation

The relative amount of disorganization

Entropy

is an unusable form of energy

Heat

as soon as a critizal level of end product builds up

If an enzymatic reaction was controlled by feedback inhibition, we would expect it to stop

breaking down molecules

catabolism

requires input of energy

endergonic reaction

spontaneous and release energy

exergonic reactions

Proteins

most enzymes are

ATP supplies the energy needed to pump substances across the plasma membrane

transport work

energy cannot be created or destroyed but it can be changed from one form to another

which of the fallowing statements most accurately describes the first law of thermodynamics

synthesis of molecules

anabolism

endergonic reaction

Chemical reactions that require an input of energy are

ADP plus phosphate plus energy

ATP can be broken down into

The enzym and the substrate form a temporary complex

During an enzymatic reaction, what happens to the enzyme?

ATP supplies the energy needed for muscle contractions, chromosomes to moves cilia and flagella to beat, ext

Mechanical work

but the amount of stored ATP is not great because our body constantly generates ATP from ADP + P

Most cells use a tremendous amount of ATP

the sun

The ultimate source of energy for the majority of organisms on Earth is

a coupled reaction

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

Entropy has decreased

When a cell uses substantial energy to organize its cell contents to a greater degree than the organization that exists outside the living cell:

adding the correct enzyme can lower the energy of activation

Which is true about energy of activation

Chemicals, but no energy, may cycle through living things

Which of the following is a true statement regarding energy and chemicals?

Metobolic pathways often intersent one another

Which of the following is an accurate statement about metobolic pathways?

whether or not oxygen is involved, a reaction is considered an oxidation reaction if electrons are lost

Which of the following is true statement regarding oxidation reaction?

The catalyze only one specific type of reaction

Which of the following statements is true about enzyme

change to optimum pH for the reaction

Which of the following will increase enzyme activity?

Energy cannot be changed from one formt o another without a loss of usable energy

Which statement most accurately describes the second law of thermodynamics

free energy

amount of energy available to do work after a chemical reaction has occurred is called

subtracting the free energy content of the reactants from that of the products

the change in free energy of a reaction, delta G, is calculated by


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