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Respiration in Plants · Question 35

AIPMT 2007MCQEasy📈 Topic in 38% papers+4−1
1

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

Answer

(3) succinate dehydrogenase

Solution

Succinate dehydrogenase, which oxidises succinate to fumarate (with FAD → FADH2), is the only TCA-cycle enzyme bound to the inner mitochondrial membrane; it is also complex II of the electron transport system. In prokaryotes (no mitochondria) it is present in the cytosol / plasma membrane.

∵ Isocitrate dehydrogenase and malate dehydrogenase are in the matrix, and lactate dehydrogenase is not a TCA-cycle enzyme (it acts in lactic acid fermentation) ⇒ (1), (2), (4) are wrong.

Answer: (3)

AIPMT 2007

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2

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
3

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
4

In glycolysis, during oxidation electrons are removed by

  1. ATP
  2. glyceraldehyde-3-phosphate
  3. NAD+
  4. molecular oxygen.
AIPMT 2004
5

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
6

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
7

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

  1. 2
  2. 4
  3. 38
  4. 34
AIPMT 2002
8

Cytochrome is

  1. metallo flavo protein
  2. Fe containing porphyrin pigment
  3. glycoprotein
  4. lipid.
AIPMT 2001

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