Q.1
Match the column ... [ AIIMS 2007 ]
(a) tRNA (1) Joining of amino acids
(b) mRNA (2) Transfer of genetic information
(c) rRNA (3) Nucleolar organising region
(d) Peptidyl transferase (4) Passage of amino acids to ribosome
  • a) a - 4, b - 2, c - 3, d - 1
  • b) a - 1, b - 4, c - 3, d - 2
  • c) a - 1, b - 2, c - 3, d - 4
  • d) a - 1, b - 3, c - 32, d - 4
Q.2
The transforming principle of Pneumococcus as found out by Avery, MacLeod and MCCarty was ... ... [ JIPMER 2000 ]
  • a) mRNA
  • b) DNA
  • c) Protein
  • d) Polysaccharide
Q.3
Sequence of amino acids in a polypeptide is determined by .... [ AFMC 2011 ]
  • a) rRNA
  • b) mRNA
  • c) tRNA
  • d) snRNA
Q.4
Which is important for transcription? [ AIIMS 2002 ]
  • a) CAAT Box
  • b) Promoter
  • c) DNA polymerase
  • d) DNA methylase
Q.5
DNA gyrase is a type of ... ... [ KCET 2010 ]
  • a) DNA topoisomerase
  • b) DNA ligase
  • c) DNA polymerase
  • d) Reverse transcriptase
Q.6
What is correct for protein synthesis? [ CPMT 1996]
  • a) Code transfer on mRNA
  • b) Code transfer on tRNA
  • c) Coding is done by DNA strands
  • d) DNA coding takes place in antiparallel fashion
Q.7
In eukaryotes transcription occurs in .... .... [ BHU 2002 ]
  • a) Cytoplasm
  • b) Nucleus
  • c) Cytosol
  • d) Matrix
Q.8
Match the column and find the correct combination ... ... [ kerala 2004 ]
(a) AUG (i) Phenylalanine
(b) UAA (ii) Methionine
(c) UUU (iii) Tryptophan
(c) UGG (iv) Termination
  • a) a-i, b-iv, c-ii, d-iii
  • b) a-iv, b-iii, c-iii, d-i
  • c) a-iv, b-i, c-iii, d-ii
  • d) a-ii, b-iv, c-i, d-iii
Q.9
Gene capable of moving from one chromosome to another is .... ... [ BHU 2008 ]
  • a) Cosmid
  • b) Exonic gene
  • c) Transposon
  • d) Mute gene
Q.10
Mutation cannot change ... .... [ KCET 2007]
  • a) Enzymes
  • b) DNA
  • c) RNA
  • d) Environment
Q.11
Which amino acid has a single codon ... ... [ AMU 2011]
  • a) Serine
  • b) Cysteine
  • c) Tyrosine
  • d) Tryptophan
Q.12
DNA replication is ... ... [ CBSE 2000 ]
  • a) Conservative and discontinuous
  • b) Semi-conservative and semi-discontinuous
  • c) Semi-conservative and discontinuous
  • d) Conservative
Q.13
Largest gene in humans is ... ... [ kerala 2009 ]
  • a) DMD
  • b) INS gene
  • c) Oncogene
  • d) β-globin of haemoglobin
Q.14
Chargaff's rule are applicable to .... .. [ KCET 2002 ]
  • a) Single stranded RNA
  • b) Single stranded DNA and RNA
  • c) Single stranded DNA
  • d) Double stranded DNA
Q.15
Assertion : Amber is termination codon Reason: If is an mRNA a termination codon is present, protein synthesis stops abruptly whether it is complete or not ... .... [ AIIMS 2007 ]
  • a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
  • c) Assertion is true but, Reason is false
  • d) Assertion is false but, Reason is true
Q.16
Environmental agent triggering transcription from an operon is .... ... [ CBSE 1995 ]
  • a) Inducer
  • b) Regulator
  • c) Derepressor
  • d) Controlling factor
Q.17
Which is not correct ... ... [ KCET 2010 ]
  • a) UGG codes for tryptophan
  • b) UAA codes for lysine
  • c) Cysteine is coded by UGU and UGC
  • d) Tyrosine is coded by UAU and UAC
Q.18
Genes are organised over ... ... [ CPMT 2003 ]
  • a) Chromosome
  • b) Chromonema
  • c) Lysosome
  • d) Golgi body
Q.19
A nonsense/ termination codon is .... .. [ DPMT 200 8]
  • a) UUU
  • b) GCG
  • c) UAG/UAA
  • d) CCC
Q.20
Matching DNA sequence of criminal with suspect is known as .... ... [AMU 2005 ]
  • a) DNA finger printing
  • b) DNA amplification
  • c) Gene mapping
  • d) DNA resolution
Q.21
Larger subunit of ribosome produces ... ....
  • a) Gyrase
  • b) RNA-polymerase
  • c) Topoisomerase
  • d) Peptidyl transferase
Q.22
Who proved that DNA is basic genetic material? [ CBSE 1993 ]
  • a) griffith/ Avery et al
  • b) Watson
  • c) Boveri and Sutton
  • d) Hershey and Chase
Q.23
In which of the following will DNA melts at the lowest temperature ... ... [ BHU 1998 ]
  • a) 5' -AATAAAGC -3' 3' -TTATTTCG -5'
  • b) 5' -AATGCTGC -3' 3' -TTACGACG -5'
  • c) 5' -ATGCTGAT -3' 3' -TACGACTA -5'
  • d) 5' -GCATAGCT -3' 3' -CGTATCGA -5'
Q.24
Some genes in bacteria and virus may code for more than one polypeptide. they are ... ... [ Odisha 2011 ]
  • a) Overlapping genes
  • b) Split genes
  • c) Jumping genes
  • d) None of the above
Q.25
DNA segment, 3' TAC ATG GCT CCG 5', transcribes one mRNA. Four tRNAs with anticodons (a) AUG (b) UAC (c) CCG and (d) GCU are required for translation. What is the order of tRNAs .... [ KCET 2002 ]
  • a) abdc
  • b) badc
  • c) abcd
  • d) bacd
Q.26
Which is mostly transcribed ... ... [ Odisha 2006 ]
  • a) Single copy DNA sequence
  • b) Highly repetitive DNA sequence
  • c) Middle repetitive DNA sequence
  • d) Only RNA sequence
Q.27
The element of bacterial transformation was discovered by ... ... [ MPPMT 1998 ]
  • a) Beadle and Tatum
  • b) Avery et al
  • c) Khorana
  • d) Robert Brown
Q.28
On which organism Beadle and Tatum worked to propose one gene-one enzyme hypothesis ... ... [ CBSE 2007 ]
  • a) Drosophila
  • b) Escherichia coli
  • c) Neurospora crassa
  • d) Nostoc
Q.29
Enzyme responsible for DNA chain elongation is ... ...
  • a) DNA polymerase II
  • b) DNA ligase
  • c) RNA polymerase
  • d) DNA polymerase III
Q.30
Reverse transcriptase .... .... [ AFMC 1999 ]
  • a) Disintegrates host DNA
  • b) Polymerises host DNA
  • c) Translates host DNA
  • d) Transcribes viral RNA to cDNA
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