Answer
Verified
394.5k+ views
Hint: Central dogma states that all the information required to make proteins are present in the DNA, whereas RNA acts as messenger to carry this information to the ribosomes, by which translation takes place. Griffith performed an experiment on the pneumonia bacteria and found the transforming principle.
Complete answer:
a) Central dogma was proposed by Francis crick.
It states that during the expression of the protein coding gene, the information passes from the DNA and from it is transferred to the RNA and finally to proteins.
This flow of information during the formation of protein is called as central dogma of the molecular biology
It is universally accepted, but there is one exception for this, it is Retrovirus, because in this RNA is transferred to DNA with the help of enzyme reverse transcriptase.
b) Based on previous Mendel experiments, Griffith conducted the experiments on streptococcus pneumonia.
Where they collect the streptococcus pneumonia and cultured the bacteria on cultured plates.
While culturing they identified two strains, one is smooth shiny bacteria said to be S strain, and rough bacteria said to be R strain.
The difference between the S and R is the presence of a mucous coat on S strain, which is absent in R strain.
They injected into Mice and observed, Mice injected with S strain develops pneumonia, while Mice injected with R strain was alive.
Later they heated the strains and injected and concluded that transferring things is the genetic material.
Note:
Actually in the year of 1940 after the pandemic of Spanish flu, so many deaths are again noticed and it is identified that this is because of pneumonia, so Griffith started experiments to find out the vaccine for the pneumonia, during this research he identified DNA as the transforming material.
Complete answer:
a) Central dogma was proposed by Francis crick.
It states that during the expression of the protein coding gene, the information passes from the DNA and from it is transferred to the RNA and finally to proteins.
This flow of information during the formation of protein is called as central dogma of the molecular biology
It is universally accepted, but there is one exception for this, it is Retrovirus, because in this RNA is transferred to DNA with the help of enzyme reverse transcriptase.
b) Based on previous Mendel experiments, Griffith conducted the experiments on streptococcus pneumonia.
Where they collect the streptococcus pneumonia and cultured the bacteria on cultured plates.
While culturing they identified two strains, one is smooth shiny bacteria said to be S strain, and rough bacteria said to be R strain.
The difference between the S and R is the presence of a mucous coat on S strain, which is absent in R strain.
They injected into Mice and observed, Mice injected with S strain develops pneumonia, while Mice injected with R strain was alive.
Later they heated the strains and injected and concluded that transferring things is the genetic material.
Note:
Actually in the year of 1940 after the pandemic of Spanish flu, so many deaths are again noticed and it is identified that this is because of pneumonia, so Griffith started experiments to find out the vaccine for the pneumonia, during this research he identified DNA as the transforming material.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
Using the following information to help you answer class 12 chemistry CBSE
Which of the following would not be a valid reason class 11 biology CBSE
Why should electric field lines never cross each other class 12 physics CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
Select the word that is correctly spelled a Twelveth class 10 english CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
What is the z value for a 90 95 and 99 percent confidence class 11 maths CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
What organs are located on the left side of your body class 11 biology CBSE
What is BLO What is the full form of BLO class 8 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE