Short Answer TypeThe base sequence in one of the strands of DNA is TAGCATGAT.
(i) Give the base sequence of its complementary strand.
(ii) How are these base pairs held together in a DNA molecule?
(iii) Explain the base complementarity rules. Name the scientist who framed this rule.
Long Answer TypeDescribe how the lac operon operates, both in the presence and absence of an inducer in E.coli.
Short Answer Type(a) Draw a neat labelled diagram of a nucleosome.
(b) Mention what enables histones to acquire a positive charge.(a) Diagram of Nucleosome
(b) Histones are positively charged because they are rich in the basic amino acid residues like lysine and arginine which carry positive charges in their side chains.
Long Answer TypeDescribe Frederick Griffith’s experiment on Streptococcus pneumonia. Discuss the conclusion he arrived at.
Short Answer TypeFollowing are the features of genetic codes. What does each one indicate ? [2]
Stop codon; Unambiguous codon; Degenerate codon; Universal codon.
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