Microbiologists found that an enzyme-producing bacterial strain received little protection from its enzyme because the molecule diffused away, while a capsule-bearing strain produced no enzyme and was also vulnerable. In mixed colonies, however, the capsule trapped the enzyme near both strains, sharply improving their survival. Because this protection appeared only through interaction and was not present in either strain alone, researchers described it as an ______ property of the mixed colony.
Which choice completes the text with the most logical and precise word or phrase?
For a words-in-context question, identify the exact relationship the blank must express before evaluating the options. Here, compare what happens in each strain alone with what happens in the mixed colony, then select the word whose definition captures that system-level difference rather than merely describing combination, inheritance, or chance.
Hints
Compare the separate and mixed colonies
Determine whether either strain has the protective feature when grown by itself.
Focus on the level of organization
Look for a word describing a feature that exists at the level of the mixed colony because its components interact.
Step-by-step Explanation
Identify how the protection arises
Neither strain receives meaningful protection on its own. Protection appears only when the enzyme-producing strain and the capsule-bearing strain interact.
Choose the precise description
An emergent property is a feature of a combined system that is not present in its individual components. That meaning precisely matches the mixed colony's protection.