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1. The plasmid-mediated properties is/are
A. fermentation of lactose
B. production of enterotoxin
C. resistance to antibiotics
D. all of these
2. In the extracellular medium, DNA-degrading enzymes would likely be to prevent the transfer of DNA by
A. conjugal transfer by a self-transmissible plasmid
B. generalized phage transduction
C. natural transformation
D. none of the above
3. What is the term used for a segment of DNA with one or more genes in the centre and the two ends carrying inverted repeat sequences of nucleotides?
A. Plasmid
B. Transposon
C. Insertion sequence
D. None of these
4. The plasmids can be eliminated from a cell by the process known as
A. curing
B. breaking
C. fixing
D. expulsion
5. Recombination of virus genomes occurs
A. by transduction
B. by transcription
C. simultaneous infection of a host cell by two viruses with homologous chromosomes
D. by transformation
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