Biochemistry: Biologic Oxidation By Jiryl at Silliman University | Flashcards & Summaries

Lernmaterialien für Biochemistry: Biologic Oxidation by Jiryl an der Silliman University

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TESTE DEIN WISSEN

True or false.

Oxidation of a molecule (the

electron donor) is always accompanied by reduction of a second molecule

(the electron acceptor).

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TESTE DEIN WISSEN

True

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TESTE DEIN WISSEN

True or false.

Many biologic oxidations can take place without the participation of molecular oxygen, 

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TESTE DEIN WISSEN

True

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TESTE DEIN WISSEN

Free energy changes can be expressed in terms of ______ potential.

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TESTE DEIN WISSEN

redox

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TESTE DEIN WISSEN

The _______ is proportionate to the tendency of reactants to donate or accept electrons.

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TESTE DEIN WISSEN

free energy change

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TESTE DEIN WISSEN

However, for biologic systems, the redox potential (E′0) is normally expressed at pH 7.0, at which pH the electrode potential of the hydrogen electrode is -0.42 V.

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TESTE DEIN WISSEN

True

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TESTE DEIN WISSEN

What are the 4 groups of oxidoreductases?

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1. oxidases

2. dehydrogenases

3. hydroperoxidases

4. oxygenases

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TESTE DEIN WISSEN

Oxidases catalyze the removal of hydrogen from a substrate using oxygen

as a hydrogen acceptor. They form ______ or _______ as a

reaction product.

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TESTE DEIN WISSEN

water

hydrogen peroxide

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TESTE DEIN WISSEN

_______ is a hemoprotein widely distributed in many tissues, having the typical heme prosthetic group present in myoglobin,  hemoglobin, and other cytochromes.

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TESTE DEIN WISSEN

Cytochrome oxidase

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TESTE DEIN WISSEN

Cytochrome oxidase is aka


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TESTE DEIN WISSEN

cytochrome aa3


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TESTE DEIN WISSEN

Flavoproteins examples:


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TESTE DEIN WISSEN

amino acid oxidase

xanthine oxidase

aldehyde dehydrogenase

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TESTE DEIN WISSEN

2 main functions of dehydrogenase

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TESTE DEIN WISSEN

1. Transfer of hydrogen from one substrate to another in a coupled

oxidation-reduction reaction

2. Transfer of electrons in the respiratory chain of electron transport

from substrate to oxygen

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TESTE DEIN WISSEN

______ defined as the removal of electrons and ______ as the gain of electrons.

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TESTE DEIN WISSEN

oxidation

reduction

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Q:

True or false.

Oxidation of a molecule (the

electron donor) is always accompanied by reduction of a second molecule

(the electron acceptor).

A:

True

Q:

True or false.

Many biologic oxidations can take place without the participation of molecular oxygen, 

A:

True

Q:

Free energy changes can be expressed in terms of ______ potential.

A:

redox

Q:

The _______ is proportionate to the tendency of reactants to donate or accept electrons.

A:

free energy change

Q:

However, for biologic systems, the redox potential (E′0) is normally expressed at pH 7.0, at which pH the electrode potential of the hydrogen electrode is -0.42 V.

A:

True

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Q:

What are the 4 groups of oxidoreductases?

A:

1. oxidases

2. dehydrogenases

3. hydroperoxidases

4. oxygenases

Q:

Oxidases catalyze the removal of hydrogen from a substrate using oxygen

as a hydrogen acceptor. They form ______ or _______ as a

reaction product.

A:

water

hydrogen peroxide

Q:

_______ is a hemoprotein widely distributed in many tissues, having the typical heme prosthetic group present in myoglobin,  hemoglobin, and other cytochromes.

A:

Cytochrome oxidase

Q:

Cytochrome oxidase is aka


A:

cytochrome aa3


Q:

Flavoproteins examples:


A:

amino acid oxidase

xanthine oxidase

aldehyde dehydrogenase

Q:

2 main functions of dehydrogenase

A:

1. Transfer of hydrogen from one substrate to another in a coupled

oxidation-reduction reaction

2. Transfer of electrons in the respiratory chain of electron transport

from substrate to oxygen

Q:

______ defined as the removal of electrons and ______ as the gain of electrons.

A:

oxidation

reduction

Biochemistry: Biologic Oxidation by Jiryl

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