True about sex pilus
Correct Answer: Hollow tubular structure binding bacteria during conjugation
Description: Ans: a) (Hollow tubular....) Ref: Medical microbiology Jawetz 23nl ed. Baily & Scott's diagnostic microbiology 12th edCONJUGATION* Process where male/ donor bacterium mates or makes physical contact with female/ recipient bacterium & transfers genetic elements into it. 1st described by Lederberg & Tatum in E coli called K12.* Plasmids are the genetic elements most frequently transferred by conjugation. But hostDNA& transposons all can be transferred by conjugation.* Fertility factor carried on plasmid is designated F+. This plasmid confers certain donor characteristics upon cells; these characteristics include a sex pilus: an extracellular multimeric protein extrusion that attaches donor cells to recipient organism lacking F factor.* Plasmid DNA in donor replicates & a copy of it passes from door to recipient along sex pilus. Thus recipient becomes F+& can conjugate with other cells.* Along with plasmid DNA, a portion of host DNA is sometimes transferred.* When F exists in some cells in intergrated state with host chromosome - HFr
Category:
Microbiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now