UPSC Prelims 2010·GS1·science-and-technology·science and technology

Which one of the following processes in the bodies of living organisms is a digestive process?

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  1. ABreakdown of proteins into amino acidsCorrect
  2. BBreakdown of glucose into CO₂ and H₂O
  3. CConversion of glucose into glycogen
  4. DConversion of amino acids into proteins

Explanation

Digestion is the biological process of breaking down complex, large food molecules into smaller, simpler, and water soluble molecules that can be easily absorbed by the body. Option A is correct because proteins are complex macromolecules that must be broken down into their constituent units, amino acids, to be utilized by the organism. Option B describes cellular respiration, which is a process of energy release. Options C and D describe anabolic processes where smaller units are built up into larger storage or structural molecules. Therefore, only the breakdown of proteins into amino acids fits the definition of a digestive process.
science-and-technology: Which one of the following processes in the bodies of living organisms is a digestive process?

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