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Which of the following is true about pathogenicity islands. A. often has a different GC content...

Which of the following is true about pathogenicity islands.

A. often has a different GC content

B. contains multiple virulence genes

C. often carried by phage or plasmids

D. all of the above are true

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Answer #1

The right option is Option (D) All of the above are true

Explanation :-

Pathogenicity islands are GC rich and their GC content varies and differ considerably in comparison to the other part of the genome.

Pathogenicity islands contains genes for a lot of different factors involved in virulence such as Toxins, Adhesins, effector, Superantigens etc. So one island may contain multiple virulence factors.

They are transferred from one bacteria to other through Horizontal gene transfer. HGT is possible only through Plasmids and phages, thus often they are carried by these elements.

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