Two Different Strains of a Mutant Phage Infect a Single

question 47

Multiple Choice

Two different strains of a mutant phage infect a single bacterium. One phage strain is d^- and the other is e^-. Some of the progeny phages are genotype d⁺e⁺, and some are d^-e^-. What genetic phenomenon does this demonstrate?

• A) complementation
• B) specialized transduction
• C) generalized transduction
• D) recombination
• E) conjugation

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Definitions:

Helium

A chemical element with symbol He and atomic number 2, known for being a lightweight, inert gas widely used in balloons and as a coolant.

Neon

A chemical element with the symbol Ne and atomic number 10, it is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air and is used in fluorescent lamps and signs.

Argon

A noble gas element with the atomic number 18, colorless, odorless, and inert, making up about 1% of the Earth's atmosphere.

React

To react means to respond to a stimulus or to undergo a chemical change.