Which one among the following statements is correct ?

Enzymes are biological catalysts that accelerate chemical reactions within living organisms [5]. Historically, it was believed that all enzymes were proteins; however, the discovery of ribozymes (catalytic RNA molecules) in the 1980s modified this absolute axiom. Despite these exceptions, the vast majority of enzymes are indeed proteins [6]. Conversely, the statement 'All proteins are enzymes' is incorrect because proteins serve a wide variety of non-catalytic roles, including structural support, transport (like hemoglobin), and regulation [6]. While modern biochemistry recognizes ribozymes, in the context of general biological classifications and standard academic examinations, the relationship is traditionally defined by the fact that enzymes are a specialized subset of proteins [6]. Therefore, among the provided options, the statement that all enzymes are proteins is the most accurate representation of their fundamental biochemical nature.

Sources

1. [5] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 25: Agriculture > Nitrogen (N) > p. 363
2. [3] https://www.britannica.com/science/enzyme
3. [6] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 1: Ecology > f)Materials: > p. 6
4. [4] https://pmc.ncbi.nlm.nih.gov/articles/PMC4692135/
5. [1] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > How do living things get their food? > p. 81