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Metabolic Biochemistry: 

 

Metabolic pathway is a series of chemical reactions, the various metabolites are formed which are products and intermediates, a metabolic pathway is two types, a catabolic pathway( breaking of molecules and energy is released) and anabolic pathway( molecules are formed and energy is released).

 

Metabolic Biochemistry Sample Questions:

 

Question 1: What are the functions of the TCA cycle?

 

1. NADH generation and reduced flavins.
2. A-ketoglutarate form
3. acetyl-CoA oxidation is produced from glycolysis and fatty acid oxidation.
4.  Excess ATP utilization generated by glycolysis.

 

1) 1, 2, and 3 are correct.
2) 1 and 3 are correct.
3)  2 and 4 are correct.
4)  only 4 are correct.
5)  all four are correct

 

Answer: 1)1, 2, and 3 are correct.

Explanation: Functions of the TCA cycle are NADH generation

 

 

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Question 2: Which substances can directly be formed by a carbon dioxide fixation reaction?

 

1) glucose
2) glutamine
3) lactic acid
4) pyruvic acid
5) oxaloacetic acid

 
Answer:  5) oxaloacetic acid

Explanation: Because carbon dioxide and pyruvate

 

 

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Question 3: What helps the heme group function as an electron carrier?

 

1) Magnesium
2) Iron
3) Phosphorus
4) Silver


Answer: 2) Iron

Explanation: All options are correct because the allosteric

 

 

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Question 4: Why rotenone ingestion is lethal?

 

1) Inhibition of ATP production.
2) Inhibition of electron flow.
3) Inhibition of NADH dehydrogenase.
4) All of the above.


Answer: 4) All of the above.

Explanation: The rotenone is toxic because it inhibits all of the above

 

 

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Question 5: Which of the following is a more potent poison in the electron transport chain?

 

1) Rotenone
2) Antimycin-A
3) Both 1 and 2
4) None of the above.

 

Answer: 2) Antimycin-A

Explanation: antimycin-A is a more potent poison because 

 

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Question 6: What is the respiratory quotient of malic acid?
 

1) 0.7
2) 0.8
3) 1.33
4) 4.0


Answer: 3) 1.33

Explanation: It is because the respiratory quotient of organic acids

 

 

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Question 7: Warburg effect is advantageous to which type of cells.

 

1) Normal somatic cells.
2) Normal germinal cells.
3) Cancer cells.
4) Bacterial cells.

 

Answer: 4) Bacterial cells.

Explanation: Because in Warburg effect there is increased 

 

 

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Question 8: Where does lactic acid fermentation take place?

 

1) Pancreas
2) Stomach
3) Intestine
4) Muscle and liver cells

 

Answer: 4) Muscle and liver cells

Explanation: Lactic acid fermentation takes place in muscle and liver cells 

 

 

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Question 9: What happens in the light reaction during photosynthesis?

 

1) A chemical reaction occurs.
2) Reduction of carbon dioxide occurs.
3) Formation of ATP and NADPH occurs.
4) All of the above.


Answer: 3) Formation of ATP and NADPH occurs.

Explanation:  In light reactions, there is a direct

 

 

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Question 10:  Which antibiotic binds with complex (iv) and inhibits the transfer of electrons to oxygen?

 

1) Antimycin-A
2) Piercidin- A
3) Cyanide, azide, and carbon monoxide.
4) All of the above.

 

Answer: 3) Cyanide, azide, and carbon monoxide.

Explanation:  Cyanide, azide reacts with the oxidized

 

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