(a) (iii) and (iv) only (b) (i) and (ii) only
(c) (i), (ii), (iii) and (v) (d) (i), (ii) and (v) only
- Which of the following is an incorrect statement?
(a) Chemically, adenine is 6 amino purine.
(b) Cytosine and adenine are purine bases.
(c) Two DNA strands are antiparallel due to hydrogen
bonds holding them together.
(d) Pitch of dsDNA is 3.4 nm.
- mRNA directs building of proteins through sequence of its
(a) exons (b) anticodons
(c) introns (d) codons.
- To which factor, RNA polymerase binds transiently to
terminate transcription?
(a) Sigma (b) Amber codon
(c) AUG (d) Rho
- Which of the following is a wrong match?
(a) Rho factor – Terminates translation
(b) AUG – Initiates transcription
(c) Sigma factor – Initiates translation
(d) All of these
- ‘QB bacteriophage’ has genetic material as
(a) ssRNA (b) dsDNA (c) dsRNA (d) ssDNA.
- E.coli with dsDNA labelled with radioactive thymidine,
allowed to replicate in simple nutrient medium for two
generation. What will be the percentage of bacteria
containing only non-radioactive DNA?
(a) 12.5% (b) 6.25% (c) 25% (d) 50%
- During protein synthesis which of the following is true?
(a) Mn++ is required for completion of ribosome.
(b) 3 ′ of mRNA enter the ribosome.
(c) Main energy source used in elongation steps is GTP.
(d) EF-Ts helps in codon-anticodon recognition.
- How many of the following statements are true?
(i) 6 turns of Z-DNA has 144 nucleotides.
(ii) Transposable elements were first discovered in maize.
(iii) Operon concept was given by Jacob and Monod while
working on yeast.
(iv) Enzyme required for peptide chain synthesis is a
ribozyme in bacteria and lies in 50S subunit.
(v) Small segment of RNA synthesised during replication
of DNA is “Okazaki segment”.
(a) 2 (b) 3 (c) 1 (d) 5
- During translation, for formation of one peptide bond, how
many phosphate bonds are used?
(a) 2 each from ATP and GTP
(b) 3 (c) 4 from GTP
(d) 2 + 1 + 1 + 1
- Virus integrated into bacterial genome is commonly called
(a) virion (b) viroid
(c) virusoid (d) provirus.
31. Which of the following is wrongly matched?
(i) Virus – Has either DNA or RNA
(ii) Peplomer – Building block of envelope
(iii) Virus – Obligate intracellular parasite
(iv) Prong and Pins – Help in locomotion in bacteriophage
(v) Virus crystallised by – Stanley
(a) (ii), (iii) and (iv) (b) All except (i)
(c) (iv) only (d) (i), (ii) and (iv)
32. Feature of genetic code where many different codons, code
for same amino acid is called
(a) deciphering of genetic code
(b) colinearity of genetic code
(c) degeneracy
(d) ambiguity.
33. Eukaryotic genome differs from prokaryotic genome in
(a) DNA is circular and single-stranded in prokaryotes
(b) IVS are present in eukaryotic DNA
(c) DNA is complexed with histones in prokaryotes
(d) DNA is not organised into operons in eukaryotes.
34. Virus mediate transfer of DNA from one bacterium to another is
(a) transduction (b) transformation
(c) transversion (d) translation.
35. A collection of DNA fragments produced by restriction
endonucleases representing, whole DNA from an organism
is called
(a) gene bank (b) gene pool
(c) gene library (d) genoid.
