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MCQs

Total Questions : 159 | Page 15 of 16 pages
Question 141. . What is the source of free energy (ΔG) for moving protons out of mitochondria against their concentration and electrical gradients?
  1.    Glycolysis
  2.    Creatine phosphate
  3.    The redox reactions of electron transport
  4.    ATP
 Discuss Question
Answer: Option C. -> The redox reactions of electron transport
Question 142. . 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.    Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium
  4.    An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport
 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 143. . Both plant and animal cell possess
  1.    cell walls
  2.    mitochondria
  3.    central vacuoles
  4.    chloroplast
 Discuss Question
Answer: Option B. -> mitochondria
Question 144. . The cellular organelle associated with secretion is the
  1.    golgi complex
  2.    mitochondrion
  3.    ribosome
  4.    lysosome
 Discuss Question
Answer: Option A. -> golgi complex
Question 145. . Which of the following statements about mitochondrial proteins is true?
  1.    All mitochondrial proteins are coded for and synthesized in the mitochondria
  2.    Some mitochondrial proteins are coded for and synthesized in the mitochondria and others
  3.    All mitochondrial proteins are imported from the cytoplasm
  4.    Mitochondrial proteins arise from other mitochondrial proteins
 Discuss Question
Answer: Option B. -> Some mitochondrial proteins are coded for and synthesized in the mitochondria and others
Question 146. . If the ester bonds of a triacylglycerol molecule's are broken then the kind of molecule, which would be soluble in water, is
  1.    fatty acid
  2.    steroid
  3.    glycogen
  4.    glycerol
 Discuss Question
Answer: Option D. -> glycerol
Question 147. . Cellular organelles are embedded in the
  1.    endoplasmic reticulum
  2.    cristae
  3.    cytosol
  4.    microtubules
 Discuss Question
Answer: Option C. -> cytosol
Question 148. . Which molecule serves as a carrier of fatty acids in mitochondria?
  1.    Acetyl-CoA
  2.    Carnitine
  3.    Dolichol
  4.    Malonyl-CoA
 Discuss Question
Answer: Option B. -> Carnitine
Question 149. . If complex III were incorporated into an artificial lipid vesicle in order to demonstrate it's proton translocating ability in isolation, which of the following would be an appropriate electron donor?
  1.    Cytochrome c red
  2.    Cytochrome c peroxidase
  3.    Ubiquinol (UQH2)
  4.    Cytochrome c oxidase
 Discuss Question
Answer: Option C. -> Ubiquinol (UQH2)
Question 150. . The composition of the inner mitochondrial membrane is most like that of
  1.    the outer mitochondrial membrane
  2.    the cell's plasma membrane
  3.    some bacterial plasma membranes
  4.    the nuclear membrane
 Discuss Question
Answer: Option C. -> some bacterial plasma membranes

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