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 2 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 2 original genes might not even be from the same original host cell!
B) It's highly likely that the 2 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 5 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 2 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 2 separate bits of DNA at the same time from the surrounding environment.
Correct Answer:
Verified
Q31: Gene transfer that requires cell-to-cell contact is
A)transformation.
B)competency.
C)conjugation.
D)functional
Q41: DNA transfer by conjugation is more efficient
Q42: Double-stranded DNA enters the recipient cell during
Q43: Transposons may leave a cell by incorporating
Q43: Organisms termed his- are considered prototrophic for
Q44: Strong chemical mutagens may be used to
Q45: Each gene mutates at a characteristic frequency.
Q50: Some bacteria have a higher incidence rate
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Q61: The Ames test is useful as a
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