Question Completion status Mng to the next queston prevents changes tome, aswer
ID: 200504 • Letter: Q
Question
Question Completion status Mng to the next queston prevents changes tome, aswer After the process of conjugation of an F+plasmid bearing bactenam with a necipent cell what is the tate of F tactor in the necpnt 0 istranstered back across me sex pus tothe donor ced Nothing n remans as a tree tragment of ONA wihin the cytopiasm Oit is hydrolyzed in the cytoplasnm O It recombines with the bacteral chromosome and is ncorporaned ito the genome o n crculanzes within the cytoplasm, forming an F plasmia Mong to the next queston events cnanges to this answer Road No, taken L OSHIBAExplanation / Answer
Plasmids can be referred as the small, circular, double stranded DNA that is is present in a bacterial cell and is physically seperated from bacterial chromosome. In simple words it can be referred as ' the extra chromosomal DNA present in a cell'.
The F plasmid ( 'F' for Fertility factor) in bacteria is a large plasmid that contain many genes on it and it can be transfereed from one bacteria to another via the process called Conjugation. The bacteria that posess an F plamid is called an F+ ( F plus) strain and the one that lack F plasmid is called an F- ( F minus) strain. Conjugation always occur between an F+ donor bacteruim with an F- reciepient bacterium through a sex pili ( conjugation canal). For conjugation to occur, there should be close physical contact between an F+ strain and an F - strain. The presence of F plasmid provides advantage to bacteria as it usually contains genes for antibiotic resistance, or genes for metabolising new substrates etc.
An F plasmid is an episome, that is they can integrate itself in a bacterial chromosome. So, the single copy of F plasmid present in a bacteria can remain integrated ( hfr strain) with the chromosome or can remain as free.
Usually it remains as a seperate, double stranded, circular DNA. This plasmid after recombination when reaches a reciepient cell, it remains in a circularized manner forming an F plasmid which is now able to tranfer it to new F- strain.ie, Last option is correct.
However, remember that in case of an Hfr strain it remains integrated in a chromosomal DNA ( Homologous crossing over which occasionaly occurs).
The remaining first three options are false. It is never transmitted back to the donor through the sex pilus. Also it can never remain as free DNA in the cytoplasm. It remains as circular , synthesis its own copy and forms double stranded circular DNA. It can never get hydrolyzed within the cytoplasm.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.