18 Questions
What is the term used for plasmids that confer pathogenicity?
Virulence plasmids
What is the function of Hfr cells in bacterial conjugation?
To integrate F plasmid into the bacterial chromosome
Which type of plasmid synthesizes toxins that kill other bacteria?
Killer plasmids
What distinguishes Hfr cells from other bacterial cells during conjugation?
Ability to form pilus
Which plasmid type allows bacteria to utilize persistent organic compounds like toxins and synthetic compounds?
Degradative plasmids
In bacterial conjugation, what is the main function of F plasmids?
To promote conjugation by forming pilus
What is the key characteristic of lysogenic bacteriophages?
They can integrate their DNA into the bacterial chromosome.
During the lytic cycle, what is the first step that occurs after the phage adsorbs to the bacterial surface?
Passage of phage DNA through the bacterial cell wall
What is a common property of lysogens that makes them immune to reinfection by a phage?
They possess prophages integrated into the bacterial chromosome.
What is the main genetic element defined as the genome of the bacterium Escherichia coli str.K-12 substr.MG1655?
Chromosomal DNA
What type of bacteria lacks certain organelles such as mitochondria and chloroplasts?
Gram-negative bacteria
In the lysogenic cycle, what happens to a bacterium containing a complete set of phage genes?
It becomes a lysogen.
Which bacterium causes food poisoning and is extensively studied in relation to bacteriophages?
Salmonella typhimurium
What distinguishes temperate phages from virulent phages?
Temperate phages can undergo lysogenic cycle.
What happens during induction in lysogens?
The prophage is excised from the bacterial chromosome and triggers the lytic cycle.
What are the genetic elements found in bacteria based on the provided text?
Chromosomal DNA, plasmids, transposable elements
Which of the following bacterial characteristics is associated with a lack of nuclear membrane and certain organelles?
Rod shape
What is the size of the genome of Escherichia coli K-12 substr.MG1655 in bases according to the text?
$4,639,221$ bases
Test your knowledge on bacterial phage life cycles including lysogenic and lytic cycles. Learn about the stages involved such as adsorption, DNA passage, and phage production.
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