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Respiration in Plants · Question 31

AIPMT 2009MCQEasy📈 Topic in 12% papers+4−1
1

Aerobic respiratory pathway is appropriately termed

  1. parabolic
  2. amphibolic
  3. anabolic
  4. catabolic.

Answer

(2) amphibolic

Solution

As per NCERT, the respiratory pathway is involved in both breakdown (catabolism) and synthesis (anabolism).

Respiratory substrates are broken down, and intermediates such as acetyl CoA and α-ketoglutaric acid are withdrawn for the synthesis of fatty acids, amino acids, etc.

The respiratory pathway is better considered an amphibolic pathway rather than a purely catabolic one.

Answer: (2)

AIPMT 2009

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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 2008
3

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
4

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
5

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
6

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
7

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
8

In glycolysis, during oxidation electrons are removed by

  1. ATP
  2. glyceraldehyde-3-phosphate
  3. NAD+
  4. molecular oxygen.
AIPMT 2004
9

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
10

In which one of the following do the two names refer to one and same thing?

  1. Krebs' cycle and Calvin cycle
  2. Tricarboxylic acid cycle and citric acid cycle
  3. Citric acid cycle and Calvin cycle
  4. Tricarboxylic acid cycle and urea cycle
AIPMT 2003
11

How many ATP molecules are produced by aerobic oxidation of one molecule of glucose?

  1. 2
  2. 4
  3. 38
  4. 34
AIPMT 2002

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