341.

Balbiani rings are the sites of

• DNA replication

• RNA and protein synthesis

• synthesis of lipids

• synthesis of polysaccharides

Which of the following is structural subunit of DNA?

• Protein

• Carbohydrate

• RNA

• Nucleotide

DNA sequences that code for protein are known as

• introns

• exons

• control regions

• intervening sequences

What is ribozyme?

Structural element of chromatin is

• histone

• acid protein and DNA

• nuclear matrix

• nucleosomes

Out of A-T, G-C pairing, bases of DNA may exist in alternate valency state owing to arrangement called

• tautomerisational mutation

• analogue substitution

• point mutation

• frameshift mutation

The chemical nature of chromatin is as follows

• nucleic acids

• nucleic acid and histone proteins

• nucleic acids, histone and non-histone proteins

• nucleic acids and non-histone proteins

Which one of the following triplet codon is a chain termination codon?

• UGU

• AAU

• UUG

• UAG

What will be the codons in mRNA if the DNA codes are ATG - CAG?

• TAC - GTC

• UAC - GUC

• UCA - TUA

• TCA - GTC

Melting of DNA at an elevated temperature (70°C) is primarily due to the breakdown of

• phosphodiester bonds

• glycosidic bonds

• disulphide bonds

• hydrogen bonds