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Respiration in Plants · Question 28

NEET 2013MCQMedium📈 Topic in 25% papers+4−1
1

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.

Answer

(4) ATP.

Solution

Pathway A = glycolysis (glucose → pyruvic acid, arrow 2); Pathway B = Krebs (TCA) cycle; Pathway C = electron transport system and oxidative phosphorylation (receives NADH by arrows 3, 6 and FADH2 by arrow 7; uses O2).

⇒ Arrow 4 is a net product of glycolysis, arrow 8 a net product of the Krebs cycle and arrow 12 a net product of the ETS.

∵ As per NCERT, ATP is formed in glycolysis (substrate-level phosphorylation), in the Krebs cycle (one GTP/ATP per turn, from succinyl-CoA) and in oxidative phosphorylation in the ETS,

∴ ATP is the only product common to all three pathways (H2O forms only in the ETS, NADH is not formed in the ETS, FADH2 forms only in the Krebs cycle).

Answer: (4)

NEET 2013

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2

In mitochondria, protons accumulate in the

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

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)
4

Aerobic respiratory pathway is appropriately termed

  1. parabolic
  2. amphibolic
  3. anabolic
  4. catabolic.
AIPMT 2009
5

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
6

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
7

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
8

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
9

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
10

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
11

In glycolysis, during oxidation electrons are removed by

  1. ATP
  2. glyceraldehyde-3-phosphate
  3. NAD+
  4. molecular oxygen.
AIPMT 2004

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