An Hfr Strain Is Produced When

question 31

Multiple Choice

An Hfr strain is produced when

• A) an F episome integrates into the E. coli chormosome.
• B) an F episome leaves the E. coli chromosome.
• C) an F episome is transferred to a new cell.
• D) an F episome leaves the host chromosome and removes some of the host chromosome.

---

Definitions:

Variable Ratio

A schedule of reinforcement where a response is reinforced after an unpredictable number of responses, making it highly resistant to extinction.

Fixed Ratio

A schedule of reinforcement where a response is reinforced only after a specified number of responses have occurred.

Variable Interval

A schedule in operant conditioning where a response is rewarded after an unpredictable amount of time has passed.

Premack Principle

A theory that more probable behaviors can reinforce less probable behaviors.