You have taken E. coli strain A which has its own plasmids, and mixed it with E. coli B strain without plasmids.  E. coli B cells now have plasmids but, in addition, they also carry some genes from E. coli A strain.  What has happened is

A. the cells of E. coli A were Hfr cells.
B. vertical transmission of DNA has occurred.
C. the E. coli B cells have become mutants of the original culture.
D. an example of transformation.


Answer: A

Biology & Microbiology

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Red blood cells are bi-concave. Their shape is determined by interior proteins anchored to the membrane termed

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Represented by only two living genera, Psilotum and Tmesipteris, ____ resemble the extinct Cooksonia. Having no

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Biology & Microbiology