What does operator mean in biology

Examples of operator in the following topics: The trp Operon: A Repressor Operon A DNA sequence called the operator sequence is encoded between the promoter region and the first trp-coding gene.

This operator contains the DNA code to which the repressor protein can bind. Because the repressor protein actively binds to the operator to keep the genes turned off, the trp operon is negatively regulated and the proteins that bind to the operator to silence trp expression are negative regulators. When tryptophan is plentiful, two tryptophan molecules bind the repressor protein at the operator sequence.

When tryptophan is absent, the repressor protein does not bind to the operator and the genes are transcribed. Conditioned Behavior In classical conditioning, a behavior is paired with an unrelated stimulus; in operant conditioning, behaviors are modified by consequences. Two types of conditioning techniques include classical and operant conditioning.

In operant conditioning, the conditioned behavior is gradually modified by its consequences as the animal responds to the stimulus.

This type of learning is an example of operant conditioning. The training of dolphins by rewarding them with food is an example of positive reinforcement operant conditioning. The lac Operon: An Inducer Operon CAP binds to the operator sequence upstream of the promoter that initiates transcription of the lac operon. If glucose is absent, then CAP can bind to the operator sequence to activate transcription.

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'operator. Send us feedback. See more words from the same year. Accessed 14 Nov. More Definitions for operator. See the full definition for operator in the English Language Learners Dictionary.

Nglish: Translation of operator for Spanish Speakers. Britannica English: Translation of operator for Arabic Speakers. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Save Word. Definition of operator. Other Words from operator operatorless adjective.

Examples of operator in a Sentence the operator of an automobile the operator of a nuclear power plant Call the operator for the phone number.

Operator , please connect me with extension She's quite an operator —no one else could have gotten them all to agree to the project. Recent Examples on the Web How quickly a utility notifies its customers often depends on when the utility is informed by the regional transmitter operator , which determines when restrictions are needed. Coast Guard, which came into question in the days after the incident. First Known Use of operator , in the meaning defined at sense 1.

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