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MCQs

Total Questions : 63 | Page 3 of 7 pages
Question 21. The number of ATP molecules produced from one glucose molecule by a bacterium producing lactic acid is
  1.    approximately equal to producing ethanol
  2.    none of these
  3.    lesser than producing ethanol
  4.    greater than producing ethanol
 Discuss Question
Answer: Option A. -> approximately equal to producing ethanol
Question 22. Which of the following is the most complete definition of fermentation?
  1.    Production of ethyl alcohol from glucose
  2.    Oxidation of glucose with organic molecules serving as electron acceptors
  3.    Complete catabolism of glucose to CO2 and HO2
  4.    Production of energy by substrate-level phosphorylation
 Discuss Question
Answer: Option B. -> Oxidation of glucose with organic molecules serving as electron acceptors
Question 23. Which one of the following is not produced in any of the steps of glycolysis?
  1.    ATP
  2.    NAD+
  3.    ADP
  4.    NADH
 Discuss Question
Answer: Option B. -> NAD+
Question 24. In anaerobic respiration, the final electron acceptor can be
  1.    oxygen
  2.    pyruvate
  3.    nitrate
  4.    acetyl-CoA
 Discuss Question
Answer: Option C. -> nitrate
Question 25. For each pair of electrons passing from NADH located inside the mitochondria to oxygen, how many ATP molecules can be generated?
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option C. -> 3
Question 26. The enzymes that catalyze the reactions of the Krebs cycle are found in which subcellular organelle of eukaryotes?
  1.    Ribosome
  2.    Mitochondrion
  3.    Chloroplast
  4.    Endoplasmic reticulum
 Discuss Question
Answer: Option B. -> Mitochondrion
Question 27. Fatty acids are oxidized to acetyl-CoA by which of the following pathways?
  1.    Embden-Meyerhof pathway
  2.    Entner-Doudoroff
  3.    pentose phosphate pathway
  4.    β-oxidation
 Discuss Question
Answer: Option D. -> β-oxidation
Question 28.  
Organisms can synthesize ATP by oxidative phosphorylation when they
  1.    ferment
  2.    oxidize glucose to pyruvate
  3.    pass electrons from the oxidation of chlorophyll through an electron transport system
  4.    pass electrons to oxygen through an electron transport system containing cytochromes
 Discuss Question
Answer: Option D. -> pass electrons to oxygen through an electron transport system containing cytochromes
Question 29.  Suppose a eukaryotic cell had a mutation that prevented the production of cytochrome c. As a result of this mutation, which of the following processes would not occur?
  1.    Cellular respiration
  2.    Photosynthesis
  3.    Mitosis
  4.    Cell wall synthesis
 Discuss Question
Answer: Option A. -> Cellular respiration
Question 30.  In glycolysis, ATP is created by
  1.    photophosphorylation
  2.    the chemiosmotic mechanism
  3.    substrate level phosphorylation
  4.    the pentose phosphate pathway
 Discuss Question
Answer: Option C. -> substrate level phosphorylation

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