Question:

Krebs' cycle starts with the formation of a six carbon compound by reaction between

Updated On: Jul 6, 2022
  • fumaric acid and pyruvic acid
  • $OAA$ and acetyl $CoA$
  • malic acid and acetyl $CoA$
  • succinic acid and pyruvic acid
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The Correct Option is B

Solution and Explanation

Acetyl $CoA$ ($2$-carbon compound) combines with oxaloacetate ($4$-carbon compound) in the presence of condensing enzyme citrate synthase to form a tricarboxylic $6$-carbon compound called citric acid. It is the first product of Krebs' cycle. $CoA$ is liberated. Acetyl $CoA +$ Oxaloacetic acid $+ H_2O$ $ {->[\text{citrate synthase}] }$ Citrate $+ CoA$
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Concepts Used:

Respiration in Plants

Respiration in plants is a process that entails the production of energy in plants. This process can simply be described as the intake of Oxygen and the release of Carbon Dioxide as an outcome of the oxidation of complex organic compounds. Though plants do not have any specific organ to balance the process of respiration, their stems, roots, and leaves do this work at a very low rate than other living beings. The process of respiration is very crucial for the plants to sustain the growth of the plant tissues.

This process can be stated as-

\[C_6H_{12}O_6 + 6O_2 → 6CO_2 + 6H_2O + \text{Energy}\]