Two Bacterial Genes Are Transduced Simultaneously

question 22

Multiple Choice

Two bacterial genes are transduced simultaneously.What does this suggest about their proximity to each other within the original host genome?

• A)Not a thing-it's highly likely that two separate virus particles were carrying each gene,and that they coinfected the new target cell at the same time,delivering their genetic payloads.This could mean the two original genes might not even be from the same original host cell!
• B)It's highly likely that the two genes are located next to each other in the original host cell chromosome.Since transduction relies on either mispackaging of bits of host cell DNA into non-functional virus units,or improper excision of lysogenic phage DNA from a host cell chromosome (carrying parts of the host cell DNA with it),the genes must lie close to each other to be transduced into a new cell simultaneously.
• C)They must be within five gene lengths of each other,but not necessarily immediately adjacent.If they were immediately adjacent,the transposons that facilitate the transfer of genetic information between the two cells wouldn't be able to 'jump' into them.
• D)It doesn't mean anything.Transduction relies on the ability of a cell to take up foreign DNA.It's possible here that the cell has simply taken up two separate bits of DNA at the same time from the surrounding environment.

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Definitions:

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A measurement indicating the number of drops contained in one milliliter of liquid, often used in medication dosing.

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A solution containing 5% dextrose (sugar) in water, used intravenously to supply calories and fluids.

Infuse

To introduce a substance, such as a drug or nutrient, into the body, typically through intravenous delivery.

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