15) Frederick Griffith infected mice with a combination of dead (encapsulated pa
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15) Frederick Griffith infected mice with a combination of dead (encapsulated pathogenic) R and live (non-encapsulated) S bacterial strains. What was the outcome, and why did it occur? A) The mice will live. Transformation was not required B) The mice will die. Transformation of genetic material from R to S was required C) The mice will live. Transformation of genetic material from S to R was required D) The mice will die. Transformation was not required E) None of the above is correct. 16) Competence is the ability of A) recipient cells to take up DNA fragments. B) donor cells to transfer DNA fragments C) plasmids to be spliced with a foreign DNA. D) F+ and F cells to conjugate E) phage to carry chromosomal DNA fragments 17) Which of the following is NOT a method of horizontal gene transfer? A) integration of a transposon B) chromosomal transfer via conjugation C) transduction D) transformation E) plasmid transfer via conjugationExplanation / Answer
15. Grifith experiment showed
E. None of the above is correct.
Correct is :- all mice will die because transformation from S to R is required so that the R strains now behave as S strains and infect and kill the mice
16. Competence is the ability of
A. Recipient cells to take up DNA fragments.
17. Not method of horrizontal gene transfer
A. Intergration of transposons.
There are three methods of horrizontal gene transfer
Transformation
Conjugation
Conjuction
18. Many bacteria secretes proteins that inhibits or kills other bacteria of related species or other strains of same species
D. Bacteriocins.
19. The transfer of chromosomal DNA via
B. Hfr × F+
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