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MCQs

Total Questions : 211 | Page 15 of 22 pages
Question 141. Which of the following takes place in substrate level phosphorylation?
  1.    Oxidation of one molecule of substrate is linked to synthesis of more than one ATP molecule
  2.    High energy intermediate compounds cannot be isolated
  3.    Only mitochondrial reactions participate in ATP formation
  4.    Substrate reacts to form a product containing a high energy bond
 Discuss Question
Answer: Option D. -> Substrate reacts to form a product containing a high energy bond
Answer: (d).Substrate reacts to form a product containing a high energy bond
Question 142. If rotenone is added to the mitochondrial electron transport chain
  1.    Succinate oxidation remains normal
  2.    P: O ratio of NADH is reduced from 3:1 to 2:1
  3.    Oxidative phosphorylation is uncoupled at site I
  4.    Rate of NADH oxidation is diminished to two-thirds of its initial value
 Discuss Question
Answer: Option A. -> Succinate oxidation remains normal
Answer: (a).Succinate oxidation remains normal
Question 143. Which of the following accepts only one electron?
  1.    Cytochrome b
  2.    Coenzyme Q
  3.    FMN
  4.    FAD
 Discuss Question
Answer: Option A. -> Cytochrome b
Answer: (a).Cytochrome b
Question 144. Chemiosmotic hypothesis does not involve
  1.    Only proton transport is strictly regulated, other positively charged ions can diffuse freely across the mitochondrial membrane
  2.    ATPase activity is reversible
  3.    Proton flow in to the mitochondria depends on the presence of ADP and Pi
  4.    Electron transport by the respiratory chain pumps protons out of the mitochondria
 Discuss Question
Answer: Option A. -> Only proton transport is strictly regulated, other positively charged ions can diffuse freely across the mitochondrial membrane
Answer: (a).Only proton transport is strictly regulated, other positively charged ions can diffuse freely across the mitochondrial membrane
Question 145. Out of the following the one having highest redox potential is
  1.    Ubiquinone
  2.    O₂
  3.    FMN
  4.    NAD
 Discuss Question
Answer: Option B. -> O₂
Answer: (b).O₂
Question 146. The proposal of chemiosmotic hypothesis was by
  1.    Peter D. Mitchell
  2.    Charles Darwin
  3.    Mendele
  4.    Alfred Russell
 Discuss Question
Answer: Option A. -> Peter D. Mitchell
Answer: (a).Peter D. Mitchell
Question 147. ATP synthesis by chemiosmosis is by
  1.    ATP dehydrogenase
  2.    Gyrase
  3.    ATP synthase
  4.    Dehydrogenase
 Discuss Question
Answer: Option C. -> ATP synthase
Answer: (c).ATP synthase
Question 148. The measure of potential energy stored as combination of proton and voltage gradients across membrane is termed as
  1.    Proton motive force
  2.    Electron motive force
  3.    Molecule motive force
  4.    Ion motive force
 Discuss Question
Answer: Option A. -> Proton motive force
Answer: (a).Proton motive force
Question 149. Three identical β subunits of the F1 complex during ATP synthesis have
  1.    Different affinities for ATP and ADP
  2.    Similar affinities for ADP and ATP
  3.    Different affinities for ADP but not ATP
  4.    Different affinities for ATP but not ADP
 Discuss Question
Answer: Option A. -> Different affinities for ATP and ADP
Answer: (a).Different affinities for ATP and ADP
Question 150. The transport of acyl co-A for oxidation using a shuttle involves formation of the intermediate
  1.    Acyl coenzyme A
  2.    3 acetyl co-A
  3.    Acyl cartinine
  4.    None of the mentioned
 Discuss Question
Answer: Option C. -> Acyl cartinine
Answer: (c).Acyl cartinine

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