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Standard XII
Biology
Krebs Cycle
Question

Which of the following reaction needs catalyses by decarboxylase enzyme?

  1. Conversion of citric acid to cis-aconitic acid
  2. Fumaric acid to malic acid
  3. Oxalosuccinic acid to α-ketoglutaric acid
  4. Malic acid to oxaloacetic acid

A
Conversion of citric acid to cis-aconitic acid
B
Oxalosuccinic acid to α-ketoglutaric acid
C
Fumaric acid to malic acid
D
Malic acid to oxaloacetic acid
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Solution
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Oxalosuccinate is decarboxylated to form α-ketoglutarate through the enzyme decarboxylase. It is one of the steps involved in Krebs cycle. It releases one molecule of CO2.
OxalosuccinateDecarboxylase→Mg2+α-ketoglutarate+CO2

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Similar Questions
Q1
In which of the following steps of citric acid cycle, CO2 is evolved?
I. Citric acid→α−ketoglutaric acidII. Succinic acid→Malic acidIII. Malic acid→Oxaloacetic acidIV. α−ketoglutaric acid→Succinyl Co−A
Select the correct answer using the codes given below
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Q2
Arrange the following compound formed in respiration based on their C-atoms in ascending order.
(I) Pyruvic acid (II) α-ketoglutaric acid (III) Citric acid (IV) Malic acid
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Q3
Pick up the reactions from the following where a water molecule is removed and reduction of NAD+ does not occur in the reactions of respiration.
i) Succinic acid to fumaric acid
ii) Malic acid to oxaloacetic acid
iii) 2-Phosphoglycerate to phosphoenol pyruvic acid
iv) Pyruvic acid to acetyl CoA
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Q4
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Q5
Before combining with the oxaloacetic acid of citric acid cycle the pyruvic acid changes into
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