What happens to the mice when they were injected with R-type live and heat killed S-type Streptococcus pneumonae strain?
a) the mice show no ill effect
b) the mice died
c) half mice died half were not affected
d) none of these
Explanation: some R-type transformed into S-type
The transfer of genetic material from one organism to another by which genetic make-up of recipient is altered is called
a) transduction
b) conjugation
c) transformation
d) mutation
Explanation: Bacterial transformation is a process of horizontal gene transfer by which some bacteria take up foreign genetic material (naked DNA) from the environment.
The agent responsible for transforming R-type to S-type went undiscovered until
a) 1928
b) 1944
c) 1949
d) 1953
Explanation: it was DNA not protein
Who discovered the transforming principle by which genetic make-up of recipient is altered?
a) Oswald Avery
b) Colin Macleod
c) Maxlyn McCarty
d) all of them
With the removing of which of the following content/s, the transforming activity of bacteria reduces?
a) protein
b) RNA
c) DNA
d) all of these
Explanation: by using DNAase enzyme
Harshay and Chase which of the following for investigating the basis of genetic material?
a) E. coli
b) S. pneumonae
c) HIV
d) Bacteriophage
Explanation: bacteriophage, also called phage or bacterial virus, any of a group of viruses that infect bacteria.
