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Quiz 13
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Q.1
Emerson's enhancement effect and Red drop have been instrumental in the discovery of :- …[AIPMT-2016]
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a) Photophosphorylation and non-cyclic electron transport
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b) Two photosystems operating simultaneously
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c) Photophosphorylation and cyclic electron transport
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d) Oxidative phosphorylation
Explanation
Answer:(b)
Q.2
The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products …[NEET 2013] Arrows numbered 4, 8, and 12 can all be
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a) NADH
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b) ATP
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c) H2O
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d) FAD+ or FADH2
Explanation
ATP is generated at substrate level in glycolysis (A) and Kreb's cycle (B) but through oxidative phosphorylation in ETS (C). Answer:(b)
Q.3
Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins? …[NEET 2013]
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a) Glucose-6-phosphate
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b) Fructose 1,6-bisphosphate
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c) Pyruvic acid
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d) Acetyl CoA
Explanation
Acetyl CoA (2C compound) is common to respiration mediated breakdown of fats, carbohydrates and proteins. Answer:(d)
Q.4
Which of the following biomolecules is common to respiration-mediated breakdown of fat s, carbohydrates and proteins ? …[NEET 2016]
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a) Pyruvic acid
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b) Acetyl CoA
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c) Glucose-6-phosphate
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d) Fructose 1,6-bisphosphate
Explanation
Answer:(b)
Q.5
Oxidative phosphorylation is :- …[NEET 2016]
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a) Addition of phosphate group to ATP.
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b) Formation of ATP by energy released from electrons removed during substrate oxidation.
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c) Formation of ATP by transfer of phosphate group from a substrate to ADP
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d) Oxidation of phosphate group in ATP
Explanation
Answer:(b)
Q.6
Which statement is wrong for Krebs' cycle? ….[NEET- 2017]
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a) There are three points in the cycle where NAD+ is reduced to NADH + H+
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b) There is one point in the cycle where FAD+ is reduced to FADH2
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c) During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised
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d) The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid
Explanation
Krebs cycle starts with condensation of acetyl CoA (2C) with oxaloacetic acid (4C) to form citric acid (6C). Answer:(d)
Q.7
What is the role of NAD+ in cellular respiration ? [NEET 2018]
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a) It functions as an enzymes
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b) It functions as an electron carrier
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c) It is a nucleotide source for ATP synthesis
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d) It is the final electron acceptor for anaerobic respiration
Explanation
Answer : (b)
Q.8
Which of these statements is incorrect ? [NEET 2018]
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a) Enzymes of TCA cycle are present in mitochondrial matrix.
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b) Glycolysis occurs in cytosol.
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c) Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
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d) Oxidative phosphorylation takes place in outer mitochondrial membrane.
Explanation
Answer : (d)
Q.9
he complex V in ETS can be inhibitted by which of the following? Question submitted by Leo Leo
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a) CO
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b) oligimycin
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c) pyruvic acid
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d) antimycin
Explanation
ATP synthase is sometimes described as Complex V of the electron transport chain (ETS) Oligomycin is an antibiotic that inhibits ATP synthase by blocking its proton channel , which is necessary for oxidative phosphorylation of ADP to ATP (energy production). The inhibition of ATP synthesis would also stop electron transport chain. Answer : (b)
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