CBSE Class 12-science Answered
describe transforming principle given in Griffiths experiments
Asked by lalit786803 | 16 Jun, 2020, 21:51: PM
S. F. Griffith in 1928 studied pathogenicity of different strains of bacterium Streptococcus pneumoniae in mice.
He worked with two strains of Pneumococcus bacteria—type III-S and type II-R.
The major difference between these two types of strains is that the type III-S strain has a smooth polysaccharide coat which makes it resistant to the immune system of mice, whereas the type II-R strain lacks this coat and thus will be destroyed by the immune system of the host.
The experiment performed by Griffith is summarised below:
The occurrence of the living S-type virulent bacteria is possible only by their formation from the R-type non-virulent bacteria which pick up the trait of virulence from dead bacteria. This phenomenon is called Griffith’s effect or transformation.
Answered by Sheetal Kolte | 17 Jun, 2020, 11:52: AM
Concept Videos
CBSE 12-science - Biology
Asked by vstshakti862 | 07 Jan, 2025, 17:52: PM
CBSE 12-science - Biology
Asked by ssmithabasumatary | 10 Sep, 2024, 19:53: PM
CBSE 12-science - Biology
Asked by sunilgupta68065 | 30 Aug, 2023, 18:00: PM
CBSE 12-science - Biology
Asked by imamsyed65p | 09 Jul, 2022, 17:33: PM
CBSE 12-science - Biology
Asked by lalit786803 | 16 Jun, 2020, 21:51: PM
CBSE 12-science - Biology
Asked by nesannesan7387 | 27 May, 2020, 14:54: PM
CBSE 12-science - Biology
Asked by lobilopatz | 16 Jun, 2019, 08:54: AM
CBSE 12-science - Biology
Asked by pb_ckt | 15 Apr, 2019, 15:18: PM
CBSE 12-science - Biology
Asked by Mirsalik25 | 05 Feb, 2019, 17:50: PM
CBSE 12-science - Biology
Asked by pardeepkumar2281 | 03 Oct, 2018, 20:09: PM