One gene-one enzyme concept is now more accurately referred to as one .................. one ................... concept.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Original Concept**: The original concept of "one gene-one enzyme" proposed that each gene is responsible for the production of a specific enzyme. This concept was introduced by scientists George Beadle and Edward Tatum.

2. **Limitations of the Original Concept**: It was later recognized that not all proteins are enzymes. While enzymes are proteins that catalyze biochemical reactions, there are many proteins that do not have enzymatic functions. This limitation of the "one gene-one enzyme" concept led to the need for a more accurate description.

3. **Introduction of New Findings**: Scientist Seymour Benzer and others showed that a single protein can be composed of multiple polypeptides, and that a gene can code for a polypeptide rather than just an enzyme. This means that one gene can influence the synthesis of a polypeptide chain that may or may not function as an enzyme.

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