Question 1.
Represser Lac-Operon protein attached to:
(a) Operator
(b) Inducer
(c) Regulator
(d) β-Glacto sidase

Answer

Answer: (b) Inducer

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Question 2.
Following is important in Ïranscription:
(a) DNA Methylase
(b) CAAT Box
(c) Promotar
(d) DNA Polymerase

Answer

Answer: (a) DNA Methylase

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Question 3.
Anticodon found in:
(a) On DNA
(b) On t-RNA
(c) On r-RNA
(d) On m-RNA

Answer

Answer: (b) On t-RNA

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Question 4.
In DNA helix:
(a) Quadrate structure
(b) Polarity
(c) Antiparallel Polarity
(d) Disuiphide bond

Answer

Answer: (c) Antiparallel Polarity

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Question 5.
During splicing axon attached and inducer enzyme for reaction:
(a) RNA Ligase
(b) RNA Catalase
(c) RNA permease
(d) RNA poloymerase

Answer

Answer: (b) RNA Catalase

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Question 6.
During DNA synthesis formed segment is:
(a) Polymerase fragment
(b) RNA fragment
(c) Okazaki fragment
(d) RNA Primer

Answer

Answer: (c) Okazaki fragment

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Question 7.
In a give DNA segment ATC ACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by the DNA segment will result in :
(a) One amino acid less in protein
(b) No change in the sequence
(c) Complete change in the type and sequence of amino acid
(d) Change in first amino acid only

Answer

Answer: (b) No change in the sequence

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Question 8.
DNA fragments are joined in a correct sequence by :
(a) DNA ligase
(b) RNA polymerase
(c) Helicase
(d) DNA polymerase

Answer

Answer: (b) RNA polymerase

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Question 9.
The ratio constant for a species is :
(a) T+C/G + A
(b) A+C/T + G
(c) G + G/A + T
(d) A + C/C + T

Answer

Answer: (b) A+C/T + G

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Question 10.
DNA repairing is done by:
(a) By DNA polymerase I
(b) By DNA Polymerase II
(c) Both (a) and (b)
(d) By Ligase

Answer

Answer: (b) By DNA Polymerase II

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Question 11.
A ribotide is made up of:
(a) Ribose + Phosphate + Uracil
(b) Deoxribose + Uracil + Phosphate
(c) Thymine + Ribose + Phosphate
(d) Deoxyribpse + Phosphate + Adenine

Answer

Answer: (a) Ribose + Phosphate + Uracil

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Question 12.
the enzyme involved in transcription is:
(a) DNA Polymerase I
(b) DNA Polymerase II
(c) RNA Polymerase
(d) DNA Polymerase

Answer

Answer: (d) DNA Polymerase

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Question 13.
Antiparallel strands of a DNA molecule means that:
(a) One strand turns clockwise
(b) One strand turns anticlockwise
(c) The phosphate groups at the start of two DNA strands are in opposite position
(d) The phosphate groups at the start of two DNA strands, at their ends, share the same position

Answer

Answer: (c) The phosphate groups at the start of two DNA strands are in opposite position

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Question 14.
Which one is mainly transcribed:
(a) Only RNA sequence
(b) Middle repetitive DNA sequence
(c) Highly repetitive DNA sequence
(d) Single copy of DNA sequence

Answer

Answer: (c) Highly repetitive DNA sequence

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Question 15.
Amino acid sequence, in protein synthesis is decided by the sequence of?
(a) c-DNA
(b) r-RNA
(c) f-RNA
(d) m-RNA

Answer

Answer: (b) r-RNA

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Question 16.
DNA multiplication is also called:
(a) Replication
(b) Transduction
(c) Translation
(d) Transcription

Answer

Answer: (b) Transduction

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Question 17.
During Protein synthesis, atone point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt:
(a) UUC, UUA, UAC
(b) UAG, UGA, UAA
(c) UUE, UCA, UCG
(d) UUU, UCC, UAU

Answer

Answer: (b) UAG, UGA, UAA

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Question 18.
One turn of the helix in p-from DNA is approximately:
(a) 20 Å
(b) 2 nm
(c) 20 nm
(d) 34 nm

Answer

Answer: (d) 34 nm

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Question 19.
Which is not component of lac operon:
(a) Primer gene
(b) Promoter gene
(c) constructive gene
(d) Regulator gene

Answer

Answer: (c) constructive gene

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Question 20.
Okazaki fregments is:
(a) RNA primer
(b) small segments of DNA on leading stand
(c) Small segments of DNA on lagging stand
(d) None of these

Answer

Answer: (c) Small segments of DNA on lagging stand

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Question 21.
Transposons occur in:
(a) In Eukaryotes
(b) In Prokaryotes
(c) In both (a) and (b)
(d) None of these

Answer

Answer: (c) In both (a) and (b)

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Question 22.
One of these is not prepared directly from DNA
(a) m-RNA
(b) f-RNA
(c) r-RNA
(d) Protein

Answer

Answer: (d) Protein

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Question 23.
Coiling of DNA duplex is:
(a) Left-handed
(b) Right-handed
(c) Parallel
(d) All of these

Answer

Answer: (c) Parallel

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Question 24.
DNA double helix model was given by:
(a) Knoll and Ruska
(b) Khorana
(c) Watson and Crick
(d) Priestley

Answer

Answer: (c) Watson and Crick

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Question 25.
Inprokaryotic translation, GTP molecule required in at:
(a) Formation of formyl-met-f-RNA
(b) Joining of 30S sub-unit of ribosome with n-RNA
(c) Joining of 30S m-RNA on Formyl-met-f-RNA
(d) Joining of 50S subunit of ribosome with initiation complex

Answer

Answer: (b) Joining of 30S sub-unit of ribosome with n-RNA

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Question 26.
DNA transcription, if nucleotide sequence of DNA strand, that is being coded in ATACG, then the nucleotide sequence in m-RNA would be:
(a) UATGC
(b) TATGC
(c) TCTGG
(d) UAUGC

Answer

Answer: (b) TATGC

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Question 27.
In a m-RNA, how many nucleotide sequence code for amino acid:
(a) One
(b) Two
(c) Three
(d) Four

Answer

Answer: (a) One

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Question 28.
RNA from which has clover leaf model:
(a) f-RNA
(b) r-RNA
(c) hn-RNA
(d) m-RNA

Answer

Answer: (a) f-RNA

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Question 29.
Nitrogenous bases present in DNA:
(a) Adenine, guanine, cytosine, thymine
(b) Adenine, guanine, cytosine, uracil
(c) Adenine, thymine, uracil
(d) Guanine, uracil

Answer

Answer: (a) Adenine, guanine, cytosine, thymine

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