(a) Glycine-valine-methionine-histidine-
lysine
(b) Lysine-methionine valine-glycine
(c) Methionine-lysine-glycine-valine-
histidine
(d) Valine-methionine-glycine-histidine-
lysine
- A segment of DNA has the triplet
base sequence. AAG, GAC, AGC, CGC,
ACA and AAA. Due to mutation the first
base only got deleted. Then the likely
effect of this on the coding of DNA
segment is that
(a) There will be complete change in the
types and sequence of amino acids
(b) Polypeptide will have one amino acid
less
(c) There will be no change in polypeptide
chain formed
(d) The first amino acid will be different - How many ATP & GTP molecules
are respectively used for each amino acid
incorporated in peptide chain?
(a) 2 & 1 (b) 1 & 2
(c) 2 & 2 (d) 3 & 3 - Which is not correct?
(a) UGG codes for tryptophan
(b) UAA codes for lysine
(c) Cysteine is coded by UGU & UGC
(d) Tyrosine is coded by UAU & UAC - A coding sequence made of alternating C
and U bases would form a polypeptide
having ....
(a) Either leu or ser residue
(b) Alterating leu and ser residues
(c) Only ser residues
(d) Only leu residues - During translation initiation in prokaryotes
GTP is required for ..
(a) Association of 30S-mRNA with
formyl-met-tRNA
(b) Binding of 30 S subunit of ribosome
with mRNA
(c) Formation of formyl-met-tRNA
(d) Association of 50 S subunit of ribosome
with initiation complex- The correct order of events for synthesis
of the lagging strand is
(a) Primase adds primer, DNA polymerase
I removes the primer, DNA
polymerase extends the segment, the
ligases seals the gap.
(b) primase adds RNA primer, DNA
polymerase III creates a stretch, DNA
polymerase I removes the primer, and
ligase seals the gaps.
(c) Helicase unwinds the DNA, primase
creates a primer, DNA polymerase I
elongates the stretch, DNA polymerase
III removes the primer, and ligase seals
the gaps in the DNA.
(d) Ligase adds bases to the primase,the
primase generates the polymerase I,
polymerase III adds to the stretch,
helicase winds the DNA. - There are 125 Amino acids, we want to
synthesis an ‘mRNA’. How many nitrogen
bases are required to form sufficient codon to
code 125 Amino acids?
(a) 375 (b) 125 (c) 42 (d) 3 - Which is correct ...
(a) Introns are present in mRNA and exons
in tRNA
(b) Codons are present in mRNA and
anticodons in tRNA
(c) Every intron is a set of three terminator
codons
(d) Exons are present in eukaryotes and
introns in prokaryotes - Escherichia coli with completely
radioactive DNA was allowed to replicate
in non-radioactive medium for two
generations. percentage of bacteria with
radioactive DNA is ...
(a) 100% (b) 50% (c) 25% (d) 12.5% - Find the number of phosphodiester bonds
and glycosidic linkages associated with E.
coli DNA respectively-
(a)
(b)