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

• phosphodiester bonds

• glycosidic bonds

• disulphide bonds

• hydrogen bonds

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

• TAC - GTC

• UAC - GUC

• UCA - TUA

• TCA - GTC

DNA sequences that code for protein are known as

• introns

• exons

• control regions

• intervening sequences

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

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

Which one of the following triplet codon is known as initiation codon?

• UUU

• UAA

• AUG

• UGA

Structural element of chromatin is

• histone

• acid protein and DNA

• nuclear matrix

• nucleosomes

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

• UGU

• AAU

• UUG

• UAG

A-DNA is

• left-handed helix with 12 nucleotide pairs per turn

• right-handed helix with 11 nucleotide pairs per turn

• right handed helix with 12 nucleotide pairs per turn

• left-handed helix with 11 nucleotide pairs per tum

What is ribozyme?