MICROBIAL RECOMBINATION AND GENE TRANSFER QUIZ

Which of the following statement(s) is/are true in regards to F+ x F- mating events?

No DNA is transferred because F- cells are unable to perform conjugation

DNA is transferred from F+ to F- cells

DNA is transferred from F- to F+ cells

No DNA is transferred because F+ cells are unable to perform conjugation

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The main difference between a self-transmissible and a mobilizable plasmid is that the self-transmissible plasmid

carries genes encoding the mating apparatus

transfers both strands of the plasmid DNA

usually has a transposon inserted into it

transfers antibiotic resistance genes

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In lysogeny,

a bacteriophage genome is integrated into the bacterial genome

bacteria take up double stranded DNA from the environment

DNA-degrading enzymes in the extracellular medium would stop the process

a bacteriophage transfers bacterial DNA

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Which of the following type of recombination does not require homologous sequences and is important for the integration of viral genomes into bacterial chromosomes?

Site-specific recombination

Mutagenic recombimation

Replicative recombination

General recombination

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Inverted repeat sequences at each end and a gene encoding transposase is contained in which of the following transposable element?

Virus

Insertion element

Plasmid

Composite transposon

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The plasmid which makes the host more pathogenic is

Metabolic plasmid

F factors

Virulence plasmid

None of these

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What is term used for a bacterial cell that is able to take up naked DNA?

Infected

Liable

Competent

Complementary

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Which type of plasmid can exist with or without being integrated into the host's chromosome?

Medisome

Lysogen

Episome

Lisosome

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F factor plasmids play a major role in

conjugation

trasnscription

replication

transduction

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The chromosomal genes, possessing fertility factor is known as

R factor

HFr

F prime factor

F factor

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