- Synthesis of all Polypeptides encoded by
nuclear genes begins in
(a) Cytosol (b) Nucleus
(c) Mitochondria (d) Golgicomplex
- In Contract to DNA Polymerase,
RNA Polymerase
(a) Synthesis RNA primer of intiate DNA
synthesis
(b) Fills the gap between Okazaki fragment
(c) Catalyses new strand in
direction
(d) Checks & edits simultaneously during
synthesis
- An eukaryotic cell, post transcription
prepares itself for synthesis of proteins,
so as to meet its metabolic needs. The
modified mRNA translates into proteins
through a sequential stepwise process.
Identify the correct sequence of steps in
translation and select the correct option.
i. Amino acylation of tRNA
ii. Attachment of larger subunit of
ribosome to mRNA-tRNA complex.
iii. Linking of adjacent amino acid to form
a polypeptide
iv. Codon anticodon reaction between
RNA and amino acyl tRNA complex
v. Attachment of mRNA with smaller
subunit of ribosome
(a) i g ii g v g iv g iii
(b) ii giii g i g iv g v
(c) i g v g iv g ii g iii
(d) ii g iv g v g i g iii
- Catabolite repression of lac operon in
E.coli occurs in presence of
(a) Glucose (b) Lactose
(c) Allolactose
(d) Glucose k Lactose
- Nirenberg synthesised an RNA having
34 adenine residues (AAAA...) and
obtained a polypeptide of 11 lysine
residues. it proved that genetic code of
lysine is
(a) Adenine (b) AA
(c) AAA (d) AAAA ....A.
31. Read the sequence of the nucleotides
in the given segment of mRNA and the
respective amino acid sequence in the
polypeptide chain.
mRNA
Polypeptide Met Phe val Ser
i. Triplet bases (codons) for (a) Valine (b)
Proline
ii. Nucleotide sequence of the DNA strand
from which this mRNA was transcribed
iii. Last codon of this RNA stands for
The correct answer to the question i, ii
and iii are
(a) i. Valine, GGU proline, CCU. ii. TAC
AAA TAC GGA CAAAGAATT. iii.
Stop.
(b) i. Valine, GUU Proline, CCU. ii. TAC
AAA TAC GGA CAAAGAAT. iii.
Stop.
(c) i. Valine, GUU Proline, CCU. ii. ATG
TTT ATG CCT GTT TCT TAA. iii.
Stop.
(d) i. Valine, GUU Proline, CCC. ii. TAC
AAA TAC GGA CAAAGAATT. iii.
Stop.
- 3’-AAATGCGCGATA-5’ sequence of
gene will have mRNA and anticodons
(a)
(b)
(c)
(d)
- From bacteria to men, a near universal code
for phenylalanine is ...
(a) UUU (b) UUA
(c) UUG (d) CUU
- In protein synthesis, a ploypeptide of
five amino acids is synthesized which
one of the following can be the correct
poplypeptide?
