NEET Biology Molecular basis of Inheritance / विरासत का आणविक आधार Question Bank

done Gene Regulation and Genetic Code Total Questions - 53

• question_answer1)
  There are 64 types of codons in genetic code dictionary because [CBSE PMT 1990]
  A)
  There are 64 types of tRNA's found in cell done clear
  B)
  There are 44 meaningless and 20 codons for amino acids done clear
  C)
  There are 64 amino acids for coding done clear
  D)
  Genetic code is triplet done clear
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• question_answer2)
  Barbara McClintock is famous for her work on [BHU 1984; AIIMS 1984]
  A)
  Wheat done clear
  B)
  Rice done clear
  C)
  Maize done clear
  D)
  Pisum done clear
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• question_answer3)
  Genes express their character by forming
  A)
  Enzymes done clear
  B)
  Carbohydrates done clear
  C)
  Fats done clear
  D)
  Vitamins done clear
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• question_answer4)
  The codons causing chain termination are [CBSE PMT 1997; BVP 2001, 02; Kerala CET 2003; MHCET 2003; Pb. PMT 2004]
  A)
  TAG, TAA, TGA done clear
  B)
  GAT, AAT, AGT done clear
  C)
  AGT, TAG, UGA done clear
  D)
  UAG, UGA, UAA done clear
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• question_answer5)
  In mRNA, AUG is the initiation codon and UAA, UAG and UGA are termination codons, therefore polypeptide cannot be synthesized beyond any of these triplets to the end of mRNA. Then which one of the following mRNA can be translated completely [AFMC 1993]
  A)
  AUG UUC UCC UGG UAA UAU done clear
  B)
  AUG UUC UCC UGA UGG UAU done clear
  C)
  AUC ACG UAU UUC UGA CUC done clear
  D)
  AUG UAU UUC UGC CUC UAG done clear
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• question_answer6)
  Genetic code consists of [AFMC 1993; CBSE PMT 1988]
  A)
  4 codons, each with two nucleotides done clear
  B)
  16 codons, each with four nucleotides done clear
  C)
  64 codons, each with two nucleotides done clear
  D)
  64 codons, each with three nucleotides done clear
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• question_answer7)
  Diamond code proposal was made by
  A)
  Watson done clear
  B)
  Nirenberg done clear
  C)
  Gamow done clear
  D)
  Stahl done clear
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• question_answer8)
  Assumption that genetic code is a triplet was suggested by [BHU 1984, 87]
  A)
  Gamow done clear
  B)
  Beadle and Tatum done clear
  C)
  S. Brenner done clear
  D)
  Nirenberg and Matthaei done clear
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• question_answer9)
  Property of a codon for always coding a specific amino acid is called
  A)
  Degenerate done clear
  B)
  Non-ambiguous done clear
  C)
  Non-overlapping done clear
  D)
  None of the above done clear
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• question_answer10)
  Who first discovered genetic code [MP PMT 1996]
  A)
  Khorana done clear
  B)
  Nirenberg and Mathaei done clear
  C)
  Kornberg done clear
  D)
  Phil Lader and Barnett done clear
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• question_answer11)
  What is meant by degenerate code
  A)
  One amino acid is coded by one code done clear
  B)
  One amino acid can be coded by more than one code done clear
  C)
  One code controls one code done clear
  D)
  One code can control more than one amino acid done clear
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• question_answer12)
  Genetic codes are
  A)
  Similar in mtDNA, virusus, bacteria and eukaryotes done clear
  B)
  Different in viruses and bacteria done clear
  C)
  Different in mtDNA done clear
  D)
  Different in mtDNA and bacteria done clear
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• question_answer13)
  In Operon concept, the regulator gene regulates chemical reactions in the cell by [AIIMS 1985]
  A)
  Inactivating enzymes in the reaction done clear
  B)
  Inhibiting transcription of mRNA done clear
  C)
  Inhibiting migration of mRNA into cytoplasm done clear
  D)
  Inhibiting the substrate in the reaction done clear
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• question_answer14)
  The genetic code is called a degenerate code because [JIPMER 1994]
  A)
  More than one codon has the same meaning done clear
  B)
  1 codon has many meaning done clear
  C)
  1 codon has one meaning done clear
  D)
  There are 64 codons done clear
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• question_answer15)
  The arrangement of three bases in the genetic code signifies a specific [MP PMT 1994]
  A)
  Protein done clear
  B)
  Amino acid done clear
  C)
  Plasmid done clear
  D)
  Nucleic acid done clear
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• question_answer16)
  The genetic code necessary for building up its own amino acids during the multiplication of virus, is carried by
  A)
  The virus nucleic acid done clear
  B)
  The virus protein done clear
  C)
  The host protein done clear
  D)
  The host nucleic acid done clear
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• question_answer17)
  An inactive repressor produced by regulator gene that does not block the operator site in the tryptophan Operon is called
  A)
  Aporepressor done clear
  B)
  Intron done clear
  C)
  Exon done clear
  D)
  Clone done clear
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• question_answer18)
  Wild type E.coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as the sugar. Which one of the following changes take place [CBSE PMT 1995]
  A)
  The lac-Operon is repressed done clear
  B)
  All Operons are induced done clear
  C)
  E. coli cells stop dividing done clear
  D)
  The lac-Operon is induced done clear
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• question_answer19)
  Khorana got the Nobel Prize on [CPMT 1995; Pb. PMT 1999]
  A)
  DNA synthesis done clear
  B)
  Genetic code done clear
  C)
  Protein synthesis done clear
  D)
  Enzyme synthesis done clear
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• question_answer20)
  The possibility of three letter genetic code was pointed out by
  A)
  Khorana done clear
  B)
  Gamow done clear
  C)
  Holley done clear
  D)
  Nirenberg done clear
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• question_answer21)
  Which is not true for Operon model
  A)
  Regulator gene done clear
  B)
  Promotor gene done clear
  C)
  Repressor gene done clear
  D)
  Operator gene done clear
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• question_answer22)
  Who was awarded Nobel prize for the synthesis of an artificial gene [Kerala PMT 2004]
  A)
  Hargovind Khorana done clear
  B)
  M.S. Swaminathan done clear
  C)
  B.P. Pal done clear
  D)
  P. Maheshwari done clear
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• question_answer23)
  'Operon model' for gene regulation in bacteria was proposed by
  A)
  Jacob and Monad done clear
  B)
  Barry Commoner done clear
  C)
  Crick done clear
  D)
  Watson and Crick done clear
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• question_answer24)
  Which of the following bases is absent in the coding dictionary
  A)
  Uracil done clear
  B)
  Thymine done clear
  C)
  Cytosine done clear
  D)
  Adenine done clear
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• question_answer25)
  Pleitrophy is a condition in which a single gene [AMU 2005]
  A)
  Controls only one phenotype done clear
  B)
  Controls more than one phenotype done clear
  C)
  Does not control any phenotype done clear
  D)
  None of these done clear
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• question_answer26)
  When more than one codon code for the same amino acid, this is called as [MP PMT 1998]
  A)
  Universal nature of genetic code done clear
  B)
  Redundancy of genetic code done clear
  C)
  Punctuation in genetic code done clear
  D)
  Continuous nature of genetic code done clear
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• question_answer27)
  In Operon concept, regulator gene functions as [CBSE PMT 1999; KCET 2004]
  A)
  Repressor done clear
  B)
  Regulator done clear
  C)
  Inhibitor done clear
  D)
  All of these done clear
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• question_answer28)
  Genes that are involved in turning on or off the transcription of a set of structural genes are called [CBSE PMT 1998]
  A)
  Polymorphic genes done clear
  B)
  Operator genes done clear
  C)
  Redundant genes done clear
  D)
  Regulatory genes done clear
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• question_answer29)
  Functioning of structural genes is controlled by   [MP PMT 2001]
  A)
  Operator done clear
  B)
  Promoter done clear
  C)
  Ligase done clear
  D)
  Regulatory gene done clear
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• question_answer30)
  Wobble hypothesis was given by [AIIMS 2002]
  A)
  R. W. Holley done clear
  B)
  H. G. Khorana done clear
  C)
  M. Nirenberg done clear
  D)
  F. H. C. Crick done clear
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• question_answer31)
  Out of 64 codons, 61 codons code for 20 types of amino acid. It is called  [CBSE PMT 2002]
  A)
  Wobbling of codon done clear
  B)
  Overlapping of gene done clear
  C)
  Universility of codons done clear
  D)
  Degeneracy of genetic code done clear
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• question_answer32)
  The regulatory genes are located [Kerala CET 2003]
  A)
  Along with the structural genes done clear
  B)
  In between operator and the structural genes done clear
  C)
  In the middle of structural genes done clear
  D)
  At the end of structural genes done clear
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• question_answer33)
  Which one of the following codons codes for the same information as UGC [AIIMS 2003]
  A)
  UGU done clear
  B)
  UGA done clear
  C)
  UAG done clear
  D)
  UGG done clear
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• question_answer34)
  Identify the correct match between the codons and coding functions. [Kerala PMT 2004]

  	Column I	Column II
  A.	AUG	1. Phenylalanine
  B.	UAA	2. Methionine
  C.	UUU	3. Tryptophan
  D.	UGG	4. Termination

  A)
  A-1, B-4, C-2, D-3 done clear
  B)
  A-2, B-4, C-1, D-3 done clear
  C)
  A-4, B-3, C-2, D-1 done clear
  D)
  A-4, B-1, C-3, D-2 done clear
  E)
  A-2, B-3, C-4, D-1 done clear
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• question_answer35)
  Which one of the following pairs is correctly matched [Kerala PMT 2004]
  A)
  Ribosomal RNA-carries aminoacids to the site of protein synthesis done clear
  B)
  Transcription-process by which protein is synthesized done clear
  C)
  Translation-process by which \[mRNA\] carries the information from nucleus to the ribosome done clear
  D)
  Anticodon-site of tRNA molecule that contains complementary bases to the triple code on the RNA done clear
  E)
  Cistron-is a unit of mutation done clear
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• question_answer36)
  A naturally occurring coding strand composed of alternating C and U residues would result in the formation of [Kerala PMT 2004]
  A)
  A polypeptide containing alternating leu and ser residues done clear
  B)
  A polypeptide containing either leu or ser residues done clear
  C)
  A polypeptide containing only leu residues done clear
  D)
  A polypeptide containing only ser residues done clear
  E)
  A polypeptide containing only phe residues done clear
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• question_answer37)
  Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it  [AIIMS 2004]
  A)
  UUA-Valine done clear
  B)
  AAA-Lysine done clear
  C)
  AUG-Cysteine done clear
  D)
  CCC-Alanine done clear
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• question_answer38)
  A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid [CBSE PMT 2004]
  A)
  One done clear
  B)
  Two done clear
  C)
  Three done clear
  D)
  Four done clear
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• question_answer39)
  In the lactose operon of Escherichia coli, what is the function of promoter
  A)
  Binding of Gyrase enzyme done clear
  B)
  Binding of RNA polymerase done clear
  C)
  Codes for RNA polymerase done clear
  D)
  Processing of messenger RNA done clear
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• question_answer40)
  Operon is [Kerala PMT 2004]
  A)
  A set of closely linked genes regulating a metabolic pathways in prokaryotes done clear
  B)
  The sequence of three nitrogen bases determining a single amino acid done clear
  C)
  The sequence of nitrogen bases in mRNA which codes for a single amino acid done clear
  D)
  A gene responsible for switching on or off other genes done clear
  E)
  A segment of DNA specifying one polypeptide chain in protein synthesis  done clear
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• question_answer41)
  Code of m-RNA and proteins are [DPMT 2004]
  A)
  Coplanar done clear
  B)
  Colinear done clear
  C)
  Nonlinear done clear
  D)
  Irregular done clear
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• question_answer42)
  In a double stranded DNA, the sequences of base pairs in one strand are AGCTAAGCC. What?s the complementary sequence on the other strand [BVP 2004]
  A)
  TCGATTCGG done clear
  B)
  CGUAUUCG done clear
  C)
  AGCTAAGC done clear
  D)
  CAUTAUCG done clear
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• question_answer43)
  Which of the following is the simplest amino acid [CBSE PMT 2005]
  A)
  Tyrosine done clear
  B)
  Asparagine done clear
  C)
  Glycine done clear
  D)
  Alanine done clear
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• question_answer44)
  In lac operon model; repressor protein binds to which site [Manipal 2005]
  A)
  Regular done clear
  B)
  Promotor done clear
  C)
  Operator done clear
  D)
  Structural genes done clear
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• question_answer45)
  Terminator gene [BHU 2005]
  A)
  Help in terminating flowering done clear
  B)
  Help in terminating seed germination done clear
  C)
  Used in hybridisation done clear
  D)
  None of these done clear
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• question_answer46)
  In the lac operon, the structural genes are switched off when [Kerala CET 2005]
  A)
  Repressor binds to operator done clear
  B)
  Repressor binds to promotor done clear
  C)
  Repressor binds to regular done clear
  D)
  Repressor binds to inducer done clear
  E)
  Repressor binds to allolactose done clear
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• question_answer47)
  In a given DNA segment ATGACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by this DNA segment will result in [Kerala CET 2005]
  A)
  Complete change in the type as well as sequence of amino acids done clear
  B)
  Change in the first amino acid only done clear
  C)
  No change in the squence done clear
  D)
  One amino acid less in the protein done clear
  E)
  No coding done clear
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• question_answer48)
  Which one of the following is common to both prokaryotes and eucaryotes [Kerala CET 2005]
  A)
  Mitotic apparatus done clear
  B)
  Histones done clear
  C)
  Mitochondira done clear
  D)
  Genetic code done clear
  E)
  Endoplasmic reticulum done clear
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• question_answer49)
  Triplet codon in genetics is [Wardha 2005]
  A)
  Fixed done clear
  B)
  Degenerate done clear
  C)
  Ambiguous done clear
  D)
  Non-wobbly done clear
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• question_answer50)
  Genetic code translates the language of [AMU 1989]
  A)
  RNA into that of proteins done clear
  B)
  Proteins into that of RNA done clear
  C)
  Amino acids into that of RNA done clear
  D)
  RNA into that of DNA done clear
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• question_answer51)
  Jacob and Monad studied lactose metabolism in E. coli and proposed operon concept, which is applicable for [CBSE PMT 2002]
  A)
  Prokaryotes done clear
  B)
  Eukaryotes done clear
  C)
  Protozoanes done clear
  D)
  All of these done clear
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• question_answer52)
  Anticodon is [CBSE PMT 1995]
  A)
  Paired triplet of bases on messenger RNA done clear
  B)
  Unpaired triplet of bases on rRNA done clear
  C)
  Paired triplet of bases on rRNA done clear
  D)
  An unpaired triplet of bases in an exposed position of tRNA done clear
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• question_answer53)
  A triplet codon means [KCET 1994; J&K CET 2002]
  A)
  A sequence of three nitrogen bases on mRNA done clear
  B)
  A sequence of three nitrogen bases in tRNA done clear
  C)
  A sequence of three bases in rRNA done clear
  D)
  The presence of only three bases in mRNA done clear
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