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MCQs

Total Questions : 159 | Page 11 of 16 pages
Question 101. What is the source of free energy (ΔG) for moving protons out of mitochondria against their concentration and electrical gradients?
  1.    The redox reactions of electron transport
  2.    ATP
  3.    Glycolysis
  4.    Creatine phosphate
 Discuss Question
Answer: Option A. -> The redox reactions of electron transport
Question 102. Water content of active protoplasm is
  1.    40%
  2.    70%
  3.    10%
  4.    90%
 Discuss Question
Answer: Option D. -> 90%
Question 103. Which of the following is not an electron carrier class in the electron transport chain?
  1.    Flavoproteins
  2.    Cytochrome c oxidase
  3.    Iron - sulfur proteins
  4.    Cytochromes
 Discuss Question
Answer: Option B. -> Cytochrome c oxidase
Question 104. Which of the following experimental results does not support Mitchell's chemiosmosis theory?
  1.    Electron transport in isolated mitochondria was shown to result in acidification of the medium
  2.    Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
  3.    An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport
  4.    Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium
 Discuss Question
Answer: Option B. -> Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis
Question 105. The cellular organelle associated with secretion is the
  1.    mitochondrion
  2.    golgi complex
  3.    lysosome
  4.    ribosome
 Discuss Question
Answer: Option B. -> golgi complex
Question 106. Cellular metabolism is an example of
  1.    steady-state metabolism
  2.    a series of reactions that defy the second law of thermodynamics
  3.    a series of reactions occurring under standard conditions
  4.    equilibrium metabolism
 Discuss Question
Answer: Option A. -> steady-state metabolism
Question 107. Both plant and animal cell possess
  1.    cell walls
  2.    chloroplast
  3.    central vacuoles
  4.    mitochondria
 Discuss Question
Answer: Option D. -> mitochondria
Question 108. Which of the following statements about mitochondrial proteins is true?
  1.    Mitochondrial proteins arise from other mitochondrial proteins
  2.    Some mitochondrial proteins are coded for and synthesized in the mitochondria and others
  3.    All mitochondrial proteins are coded for and synthesized in the mitochondria
  4.    All mitochondrial proteins are imported from the cytoplasm
 Discuss Question
Answer: Option B. -> Some mitochondrial proteins are coded for and synthesized in the mitochondria and others
Question 109. Cellular organelles are embedded in the
  1.    microtubules
  2.    cytosol
  3.    cristae
  4.    endoplasmic reticulum
 Discuss Question
Answer: Option B. -> cytosol
Question 110. The composition of the inner mitochondrial membrane is most like that of
  1.    some bacterial plasma membranes
  2.    the cell's plasma membrane
  3.    the nuclear membrane
  4.    the outer mitochondrial membrane
 Discuss Question
Answer: Option A. -> some bacterial plasma membranes

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