Class XII Subject: Biology
Time: 40 Minutes Full Marks:
40
Q.1 what will be the
number range of adenylate residue in tailing mechanism of hnRNA.
Q.2 what was the roll
of H.G Khorana in the development of genetic code.
Q. 3 A cistron
consist of 20 codons .how many amino acids will it code in the polypeptide
transcribed ? why retro virus does not follow central dogma .explain.
Q.4 Recall the
Griffith experiment if Rna instead of Dna was the genetic material,would the
heat killed strain of streptococcus have transformed the R strain in to
virulent.explain.
Q.5 lac operon is
negatively regulated .what is meant by this?
Q.6 How a polypeptide
chain synthesis terminated during protein synthesis. ?
Q.7 what are
differences between template strand and coding strand?
Q.8 Give the
differences between repetitive DNA and Satellite DNA.
Q.9How Meselson and
Stahal proved that replication of DNA
are semi conservative.
Q.10give the
enzymatic sequence of replication and a red eyed heterozygous female fruit fly
is crossed with a red eyed male . work out all possible genotypes and
phenotypes of the progeny.comment the pattern of inheritance.
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