(a) did Griffith explain the transformation of R strain (no virulent) bacteria into S strain (virulent)? (b) Explain how MacLeod, Mc Carty and Avery determined the biochemical nature of the molecule responsible for transforming R strain bacteria into S strain bacteria.
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Lichens are symbiotic association of A) Algae and bacteria
B) Algae and fungi
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Write the chemical reaction given by Van Niel in case of bacteria that use H2S and CO2 to synthesize carbohydrates. Write his postulate.
Chemical reaction given by Van Niel: 6CO2 + 12H2S → C6H12O6 + 6H2O + 12S ↓ Van Niel’s postulate: Green plants use water in place of H2S and O2 is evolved in place of...
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The top 8 inches of soil of one acre may contain ……….. of bacteria and fungi.
(B) 5 1/2 tons
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The transformation of larva into adult through drastic changes is called …..
C) Metamorphosis
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“Adolescence is the age of stress and strain” – this was said by ……….
(C) Stanley Hall
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Cyanobacteria and some other photosynthetic bacteria don’t have chloroplasts.
Cyanobacteria and other photosynthetic bacteria have thylakoids suspended freely in the cytoplasm (i.e., they are not enclosed in membrane), and they have bacteriochlorophyll.
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What does ‘competent’ refer to in competent cells used in transformation?
Competent means bacterial cells which by various methods like treatment with CaCl2 are made capable of taking up foreign DNA.
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Write the conclusion Griffith arrived at the end of his experiment with Streptococcus pneumoniae.
Griffith concluded that the R-strain bacteria had somehow been transformed by heat-killed S-strain bacteria. This must be due to transfer of genetic material.
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Calculate DeltaH (in kcal) for the following phase transformation : A (s,1 bar, `200`K) rarr A (g, `1` bar ,`200` K) Standard melting poing of A = `20
Correct Answer - 24
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How did Macleod, McCarty and Avery establish the Bio-Chemical nature of the so called "genetic material" identified by Griffith in his experiment.
They (worked on the bio-chemical nature of transforming principle in Griffith's experiment) purified proteins DNA and RNA from heat killed S cells, they discovered protein digesting enzyme (protease) RNA digesting enzyme...
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