Which one of the following triplet codon is known as initiation codon?
UUU
UAA
AUG
UGA
C.
AUG
AUG and GUG are called initiation codons because they initiate the polypeptide chain. UAA (Ochre), UAG (Amber) and UGA (Opal) are termination codons. If these codons are present in mRNA, the protein synthesis stops abruptly, whether the protein synthesis is complete or not.
UUU codes for phenylalanine.
Melting of DNA at an elevated temperature (70°C) is primarily due to the breakdown of
phosphodiester bonds
glycosidic bonds
disulphide bonds
hydrogen bonds
DNA sequences that code for protein are known as
introns
exons
control regions
intervening sequences
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
What will be the codons in mRNA if the DNA codes are ATG - CAG?
TAC - GTC
UAC - GUC
UCA - TUA
TCA - GTC
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
