Topic 8 - Cell Respiration and Photosynthesis
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Remember what goes on in oxidation and reduction
OIL RIG - oxidation it loses, reduction it gains
What happens in OXIDATION?
- Often associated with the release of energy
- Loss of electrons
- Gain oxygen
- Loss of hydrogen
What happens in REDUCTION?
- Often associated with the gain of energy
- Gain of electrons
- Loss of oxygen
- Gain of hydrogen
Where does glycolysis occur?
In the cytoplasm of cells
- One glucose is converted to 2 pyruvates2 ATP molecules are used per glucose (but 4 are made...so net increase of 2 ATP)
- 2 NAD+ are converted into 2 NADH + H+
List the 4 stages of GLYCOLYSIS
- 1. Phosphorylation
- 2. Lysis
- 3. Oxidation
- 4. ATP formation
What does the diagram show?
Cell respiration involves....
the production of ATP using energy released by oxidation of glucose, fat or other substances
What does NAD stand for?
nicotinamide adenine dinucleotide
What reaction (of respiration) occurs in the matrix of mitochondrion?
The link reaction
Where does the link reaction occur
In the matrix of mitchondrion
Outline what happens in the Link Reaction
- Enzymes in matrix of mitochondrion remove H and CO2 from pyruvate
- Hydrogen is accepted by NAD+
- Removal of H is oxidation
- Removal of CO2 is decarboxylation
The product of oxidative decarboxylation of pyruvate is an acetyl group (which is accepted by CoA).
What does the diagram show?
What is this organelle?
What are the stages in Aerobic Respiration?
- 1. Link Reaction
- 2. Krebs Cycle
- 3. Electron transport chain
What does the diagram represent?
Draw a mitochondrion diagram
Summarise Krebs Cycle
- Carbon dioxide is removed in two reactions
- Hydrogen is removed in 4 reactions NAD+ accepts the hydrogen in 3 reactions
- FAD accepts the hydrogen in 1 reaction
- ATP is produced in one of the reactions
Where does the Krebs Cycle occur?
In the matrix of the mitochondria
Which process produces the most ATP per molecule of glucose?
A. Anaerobic respiration in a yeast cell
B. Aerobic respiration in a bacterial cell
C. Glycolysis in a human liver cell
D. The formation of lactic acid in a human muscle cell
- A. Anaerobic respiration in a yeast cell
- B. Aerobic respiration in a bacterial cell
- C. Glycolysis in a human liver cell
- D. The formation of lactic acid in a human muscle cell
Which of the following is true of the link reaction of aerobic respiration?
A. The reduction of FAD+ occurs.
B. The decarboxylation of pyruvate occurs.
C. It occurs in the cytoplasm.
D. The regeneration of NAD+ occurs.
- A. The reduction of FAD+ occurs.
- B. The decarboxylation of pyruvate occurs.
- C. It occurs in the cytoplasm.
- D. The regeneration of NAD+ occurs.
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