Link Reaction 18.2 Flashcards

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1
Q

Name the main parts of the mitochondria

A
  • Outer mitochondrial membrane
  • Intermembrane space
  • Inner mitochondrial membrane
  • Cristae
  • Matrix
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2
Q

Outer mitochondrial membrane

A

Separates contents of mitochondria from the rest of the cell so that it is the optimum conditions for respiration

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3
Q

Intermembrane space

A

The electron transport chain pumps protons into here. The space is small so that the concentration builds up quickly

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4
Q

Inner mitochondrial membrane

A

This is where the electron transport chain is located and it contains hydrophilic membrane channels

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5
Q

Matrix

A

Contains mitochondrial DNA and many enzymes for the Krebs cycle and link reactions

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6
Q

Cristae

A

Projections of the inner mitochondrial membrane that increases surface area for oxidative phosphorylation

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7
Q

Where does the link reaction occur?

A

In the mitochondrial matrix

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8
Q

What is needed for the link reaction to occur?

A

ATP and oxygen

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9
Q

Describe what happens during the Link reaction

A

Pyruvate is actively transported from the cytoplasm to the mitochondrial matrix which is why ATP and oxygen are needed.

  • Pyruvate is oxidised by NAD+ which becomes NADH
  • It then has a carbon dioxide removed which is called decarboxylation and an acetyl group is formed ( 2 carbons).
  • The Co2 is removed as waste
  • The acetyl group is combined with coenzyme A to form acetyl CoA which is used later.
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10
Q

What is the role of NAD?

A

It is a coenzyme that carries hydrogens and uses them and accepts them to take part in redox reactions. The enzyme it assists is dehydrogenase enzyme

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11
Q

Why does glycolysis not occur in the mitochondria?

A
  • Glucose too big move into the mitochondria
  • Inorganic phosphate ions are needed from the cytoplasm
  • No transport proteins for pyruvate in the mitochondria
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