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Respiration in Plants · Question 27

NEET 2013MCQEasy📈 Topic in 12% papers+4−1
1

Which of the metabolites is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

  1. Pyruvic acid
  2. Acetyl CoA
  3. Glucose-6-phosphate
  4. Fructose-1,6-bisphosphate

Answer

(2) Acetyl CoA

Solution

As per NCERT (amphibolic pathway), carbohydrates are broken down to glucose → pyruvic acid → acetyl CoA; fats are broken down to glycerol and fatty acids, and the fatty acids are degraded to acetyl CoA; proteins are broken down to amino acids, which (after deamination) enter as pyruvic acid, acetyl CoA or Krebs cycle intermediates.

∵ Fatty acids enter respiration directly as acetyl CoA (not via pyruvic acid or the hexose phosphates),

∴ acetyl CoA is the metabolite common to the breakdown of all three.

Answer: (2)

NEET 2013

Keep practising — Respiration in Plants

2

The three boxes in this diagram represent the three major biochemical pathways in aerobic respiration. Arrows represent net reactants or products. [figure] Arrows numbered 4, 8 and 12 can all be

  1. H2O
  2. FAD or FADH2
  3. NADH
  4. ATP.
NEET 2013
3

In mitochondria, protons accumulate in the

  1. outer membrane
  2. inner membrane
  3. intermembrane space
  4. matrix
AIPMT 2011 (Mains)
4

The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

  1. glycolysis
  2. fermentation
  3. aerobic respiration
  4. photorespiration
AIPMT 2010 (Prelims)
5

Aerobic respiratory pathway is appropriately termed

  1. parabolic
  2. amphibolic
  3. anabolic
  4. catabolic.
AIPMT 2009
6

The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

  1. glycolysis
  2. fermentation
  3. aerobic respiration
  4. photorespiration
AIPMT 2008
7

The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because

  1. a proton gradient forms across the inner membrane
  2. there is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP)
  3. high energy bonds are formed in mitochondrial proteins
  4. ADP is pumped out of the matrix into the intermembrane space
AIPMT 2008
8

The overall goal of glycolysis, Krebs' cycle and the electron transport system is the formation of

  1. ATP in one large oxidation reaction
  2. sugars
  3. nucleic acids
  4. ATP in small stepwise units
AIPMT 2007
9

All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membrane in eukaryotes and in cytosol in prokaryotes. This enzyme is

  1. isocitrate dehydrogenase
  2. malate dehydrogenase
  3. succinate dehydrogenase
  4. lactate dehydrogenase
AIPMT 2007
10

How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO2 and H2O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?

  1. 1
  2. 2
  3. 30
  4. 57
AIPMT 2006
11

During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

  1. Glycolysis
  2. Krebs' cycle
  3. Conversion of pyruvic acid to acetyl CoA
  4. Electron transport chain
AIPMT 2005

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All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
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