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Answer for the clue "Enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic ", 13 letters:
penicillinase

Word definitions for penicillinase in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context biochemistry English) A specific type of beta-lactamase showing specificity for penicillins.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Penicillinase \Pen`i*cil"lin*ase\, n. (Bioch.) an enzyme which destroys the antibacterial activity of penicillin by hydrolyzing the amide bond in the beta-lactam ring. Many penicillinases are known, and are produced by a wide variety of bacteria. The production ...

WordNet Word definitions in WordNet
n. enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic [syn: beta-lactamase ]

Usage examples of penicillinase.

An example would be the bacteria that secrete penicillinase, which is an enzyme that destroys penicillin.