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Respiration in Plants · Question 29

AIPMT 2011 (Mains)MCQEasy📈 Topic in 38% papers+4−1
1

In mitochondria, protons accumulate in the

  1. outer membrane
  2. inner membrane
  3. intermembrane space
  4. matrix

Answer

(3) intermembrane space

Solution

During electron transport in the inner mitochondrial membrane, the complexes pump protons (H+) from the matrix into the intermembrane space.

⇒ A proton gradient is set up across the inner membrane.

∴ Protons accumulate in the intermembrane space and flow back to the matrix through F0 of ATP synthase, forming ATP.

Answer: (3)

AIPMT 2011 (Mains)

Keep practising — Respiration in Plants

2

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)
3

Aerobic respiratory pathway is appropriately termed

  1. parabolic
  2. amphibolic
  3. anabolic
  4. catabolic.
AIPMT 2009
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 2008
5

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
6

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
7

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
8

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
9

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
10

In glycolysis, during oxidation electrons are removed by

  1. ATP
  2. glyceraldehyde-3-phosphate
  3. NAD+
  4. molecular oxygen.
AIPMT 2004
11

In alcohol fermentation

  1. triose phosphate is the electron donor while acetaldehyde is the electron acceptor
  2. triose phosphate is the electron donor while pyruvic acid is the electron acceptor
  3. there is no electron donor
  4. oxygen is the electron acceptor.
AIPMT 2003

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