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21. Under which case of conjugation, recombination for chromosomal genes can be expected in E.coli? (1) F+ X F–             (2) F+ X HFr (3) F– X HFr           (4) F– X […]

20. Bacterial conjugation was first described by Lederberg and Tatum in 1946 as a phenomenon involving the exchange of markers between closely related strains Of Escherichia coli. For experiment they […]

19. The F+ segment of bacterta may be transferred to F bacteria by the process of (1) Conjugation             (2) Transduction (3) Transformation        (4) Fragmentation The correct answer is (1) Conjugation, […]

18. If bacteria possess two copies of certain genes then they referred as (1) Amphidiploid      (2) Merodiploid (3) Euploid              (4) Polyploid The correct answer for the question “If bacteria possess […]

17. F-Plasmids in bacteria helps in- (1) Transformation  (2) Transduction (3) Conjugation       (4) Replication F-plasmids in bacteria primarily facilitate conjugation, making option (3) the correct answer. This conjugative plasmid, also […]

16. Which of the following mattings between E. coli strains would result in a high frequency of transfer of chromosomal genes? (1) F+ X F–            (2)  F+ X F+ (3) […]

15. Five bacterial markers were followed for a co- transduction experiment. The following table documents the observations of this experiment. ‘+’ denotes co- transduction and ‘-‘ denotes lack thereof; ‘ND’ […]

14. Phages are collected from an infected E. coli donor strain of genotype cys+ Leu+ thr+ and used to transduce a recipient of genotype cys– Leu– thn–, The treated recipient […]

22 TRANSDUCTION WAS USED TO MAP THE fadL and two linked markers, purF and aroC are shown below. Which one of the following is the correct map for the three […]

A co-transduction experiment was performed to decipher the linear order of 4 genes: a, b, c and d. Three sets of experiments were done where transductants were selected for a […]