Molecular Basis of Inheritance PYQs Set 3 (PDF)

Set 3 of 5 · Questions 61-90 of 143

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Mere Teacher · Previous Year Questions NEET Biology · Molecular Basis of Inheritance · Set 3 (Q61-90)
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61. $Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a "triplet" :-$ (1) $Beadle and tatum$ (2) $Nirenberg and Mathaei$ (3) $Hershey and Chase$ (4) $Morgan and Sturtevant$ 62. $Differentiation of organs and tissues in a developing organism, is association with :-$ (1) $Developmental mutations$ (2) $Differential expression of genes$ (3) $Lethal mutations$ (4) $Deletion of genes$ 63. $The recombination frequency between the genes (A) & (C) is 5%, (B) & (C) is 15%, (B) & (D) is 9%, (A) & (B) is 20%, (C) & (D) is 24% and (A) & (D) is 29%. What will be the sequence of these genes on a linear chromosome?$ (1) $(A), (C), (B), (D)$ (2) $(A), (D), (B), (C)$ (3) $(D), (B), (A), (C)$ (4) $(A), (B), (C), (D)$ 64. $If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as:$ (1) $Bioinformatics$ (2) $Sequence annotation$ (3) $Gene mapping$ (4) $Expressed sequence tags$ 65. $Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria?$ (1) $23 S rRNA$ (2) $5.8 S rRNA$ (3) $5 S rRNA$ (4) $18 S rRNA$ 66. $In the polynucleotide chain of DNA, a nitrogenous base is linked to the -OH of:$ (1) $3^{’} C pentose sugar$ (2) $5^{’} C pentose sugar$ (3) $1^{’} C pentose sugar$ (4) $2^{’} C pentose sugar$ 67. $In gel electrophoresis, separated DNA fragments can be visualized with the help of :$ (1) $Ethidium bromide in infrared radiation$ (2) $Acetocarmine in bright blue light$ (3) $Ethidium bromide in UV radiation$ (4) $Acetocarmine in UV radiation$ 68. $Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?$ (1) $Guanine, Adenine - Purines$ (2) $Adenine, Thymine - Purines$ (3) $Thymine, Uracil - Pyrimidines$ (4) $Uracil, Cytosine - Pyrimidines$ 69. $A molecule that can act as a genetic material must fulfil the traits given below, except$ (1) $It should be able to generate its replica$ (2) $It should be unstable structurally and chemically$ (3) $It should provide the scope for slow changes that are required for evolution$ (4) $It should be able to express itself in the form of Mendelian characters.$ 70. $In an E.coli strain i gene gets mutated and its product can not bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome?$ (1) $z, y, a genes will be transcribed$ (2) $z, y, a genes will not be translated$ (3) $RNA polymerase will bind the promoter region$ (4) $Only z gene will get transcribed$ 71. $In eukaryotic cell transcription, RNA splicing and RNA capping takes place inside the$ (1) $Ribosomes$ (2) $Nucleus$ (3) $Dictyosomes$ (4) $Endoplasmic Reticulum$ 72. $The two polynucleotide chains in DNA are :$ (1) $Parallel$ (2) $Discontinuous$ (3) $Antiparallel$ (4) $Semiconservative$ 73. $In the history of biology, the human genome project led to the development of$ (1) $Biotechnology$ (2) $Biomonitoring$ (3) $Bioinformatics$ (4) $Biosystematics$ 74. $Which one of the following statements about the particular entity is true?$ (1) $Centromere is found in animal cells, which produces aster during cell division.$ (2) $The gene for producing insulin is present in everyone’s cell.$ (3) $Nucleosome is formed of nucleotides.$ (4) $DNA consists of core of eight histones.$ 75. $Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene?$ (1) $β-galactosidase$ (2) $Lactose permease$ (3) $Transacetylase$ (4) $Lactose permease and Transacetylase$ 76. $What are those structures that appear as ‘beads-on-string’ in the chromosomes when viewed under electron microscope?$ (1) $Nucleotides$ (2) $Nucleosomes$ (3) $Base pairs$ (4) $Genes$ 77. $Which one of the following also acts as a catalyst in a bacterial cell?$ (1) $snRNA$ (2) $hnRNA$ (3) $23S rRNA$ (4) $5 S rRNA$ 78. $The term 'Nuclein' for the genetic material was used by :$ (1) $Franklin$ (2) $Meischer$ (3) $Chargaff$ (4) $Mendel$ 79. $Gene regulation governing lactose operon of E. coli that involves the lacI gene product is$ (1) $Positive and inducible because it can be induced by lactose.$ (2) $Negative and inducible because repressor protein prevents transcription.$ (3) $Negative and repressible because repressor protein prevents transcription.$ (4) $Feedback inhibition because excess of β galactosidase can switch off transcription.$ 80. $If a DNA molecule is shortened by 25 base pairs, how many helical turns will be reduced from its structure?$ (1) $3$ (2) $2.5$ (3) $2$ (4) $1$ 81. $The commonly used vectors for human genome sequencing are$ (1) $T-DNA$ (2) $BAC and YAC$ (3) $Expression vectors$ (4) $T/Cloning vectors$ 82. $Which one of the following statement about histones is wrong?$ (1) $The pH of histones is slightly acidic.$ (2) $Histones are rich in amino acids - Lysine and Arginine.$ (3) $Histones carry positive charge in the side chain.$ (4) $Histones are organized to form a unit of 8 molecules.$ 83. $Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y-gene?$ (1) $Lactose permease and transacetylase$ (2) $β-galactosidase$ (3) $Lactose permease$ (4) $Catalase$ 84. $A single strand of nucleic acid tagged with a radioactive molecule is called$ (1) $Vector$ (2) $Selectable market$ (3) $Plasmid$ (4) $Probe$ 85. $If DNA contained sulphur instead of phosphorus and proteins contained phosphorus instead of sulfur, what would have been the outcome of Hershey and Chase experiment?$ (1) $No radioactive sulfur in bacterial cells$ (2) $Both radioactive sulfur and phosphorus in bacterial cells$ (3) $Radioactive sulfur in bacterial cells$ (4) $Radioactive phosphorus in bacterial cells$ 86. $Which of the following step cannot be considered as a process of regulation of gene expression in eukaryotes?$ (1) $Translational level$ (2) $Transcriptional level$ (3) $Replication level$ (4) $Processing level$ 87. $Which one of the following is not a part of a transcription unit in DNA?$ (1) $The inducer$ (2) $A terminator$ (3) $A promoter$ (4) $The structural gene$ 88. $Companion cells are closely associated with$ (1) $Sieve elements$ (2) $Vessel elements$ (3) $Trichomes$ (4) $Guard cells$ 89. $What initiation and termination factors are involved in transcription in prokaryotes?$ (1) $σ and ρ, respectively$ (2) $α and β, respectively$ (3) $β and γ, respectively$ (4) $α and σ, respectively$ 90. $One of the strands of double stranded DNA has base composition as follows : 15% A, 15% T, 40% G and 30% C. What will be the percentage of these bases in the complementary strand?$ (1) $15% A, .10% T, 40% G, 15% C$ (2) $15% A, 15% T, 40% G, 30% C$ (3) $15% A, 40% T, 15% G, 30% C$ (4) $15% A, 15% T, 30% G, 40% C$