Proteins in acid solution undergo?

Analysis

The question asks for the chemical process that occurs when proteins are placed in an acidic solution. We need to identify the reaction that breaks down the complex protein structure into its simpler components (amino acids).

Concept Explanation

Proteins are large, complex molecules known as polymers. They are made up of long chains of smaller units called amino acids, which are linked together by peptide bonds.

In chemistry, hydrolysis is a reaction where a molecule is broken down by the addition of water. When proteins are heated in the presence of an acid (or a base, or specific enzymes), the peptide bonds holding the amino acids together are cleaved (broken) by the addition of water molecules. This process converts the protein back into its constituent amino acids.

Step-by-Step Solution

1. Identify the structure: Proteins are polypeptides (long chains of amino acids).
2. Identify the reagent: An acid solution provides the necessary environment (H⁺ ions) to catalyze the breaking of peptide bonds.
3. Analyze the reaction: • Substitution: Involves replacing one atom or group with another; this does not break down a polymer chain. • Fermentation: A metabolic process that converts sugar to acids, gases, or alcohol; it is not the primary reaction for protein breakdown in this context. • Hydrolysis: Specifically refers to the cleavage of chemical bonds by the addition of water. This is exactly what happens to proteins in an acidic medium. • Polymerisation: The process of joining small units (monomers) to form a large chain (polymer). This is the opposite of what happens here.
4. Conclusion: Since the acid facilitates the breaking of peptide bonds using water, the process is hydrolysis.

Final Answer

The correct option is C.

Exam Tip: Whenever you see "hydrolysis," think "breaking with water." Remember that proteins are broken down into amino acids via hydrolysis, while carbohydrates (like starch) are broken down into simple sugars (like glucose) via the same process.