Molecular Basis of Inheritance Set 2

All India Pre Medical Test (AIPMT)

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This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Molecular Basis of Inheritance Set 2

Q1 | Which one is a ribozyme ?
  • Helicase
  • Ribonuclease - P
  • Peptidyl transferase
  • Both (B) & (C)
Answer: Both (B) & (C)
Q2 | Which of the following pairs is not correctly matched ?
  • Recombinant DNA - DNA forming by union of segments of DNA from diffrent Sources
  • Purines - Nitrogenous bases Cytosine , thymine and Uracil
  • ATP - The principal energy carrying compound inthe cell
  • r-RNA - RNA molecules found in ribosomes
Answer: Purines - Nitrogenous bases Cytosine , thymine and Uracil
Q3 | Which one of the following pairs is correctly matched ?
  • Ribosomal RNA - Carries amino acids to the site of protein synthesis
  • Transcription - Process by which protein in synthesized
  • Translation - Process by which m RNA carries the information from nucleus to ribosomes
  • Anticodon - Site of t-RNA that binds to the m-RNA
Answer: Anticodon - Site of t-RNA that binds to the m-RNA
Q4 | Which is not the step of translation ?
  • Initiation
  • Replication
  • Elongation
  • Termination
Answer: Replication
Q5 | The enzyme amino acyl t-RNA-synthetase facilitates.
  • Joining two neighbouring amino acids on ribosomes
  • A doption of amino acids by a t-RNA molecule
  • Insertion of amino acyl t-RNA into the ribosome sites
  • Transfer of amino acyl t-RNA from the ribosomal ‘A’ site to ‘P’ site
Answer: A doption of amino acids by a t-RNA molecule
Q6 | state the anticodon of initiation codon of protein synthesis
  • UAC
  • UUU
  • CAU
  • AUG
Answer: UAC
Q7 | Which is the energy source for the process of elongation ?
  • ATP
  • GTP
  • Creatine-PO4
  • All the above
Answer: GTP
Q8 | What does a gene consist of ?
  • Promoter
  • Initiation site & termination site
  • coding sequence
  • All the above
Answer: All the above
Q9 | Name the enzymes needed for lactose Catabolism in E.coli ?
  • ? - galactosidase, permease transacetylase
  • ? - galactosidasee Lactase, transacetylase
  • ? - galactosidase, lactase, permease
  • Lactase, permease, transacetylase
Answer: ? - galactosidase, permease transacetylase
Q10 | What does operon contain ?
  • Regulator gene + promotor gene
  • Operator gene + structural gene
  • Regulator gene + promotor gene structural gene
  • Regulator gene + promotor gene + operator gene + structural gene
Answer: Regulator gene + promotor gene + operator gene + structural gene
Q11 | Select correct match with respect to lac-operon model ?
  • Active represser + inducer ? Inactive repressor
  • Active repressor + corepressor ? Inactive repressor
  • Inactive repressor + inducer ? Active repressor
  • Inactive repressor + corepressor? Active repressor
Answer: Active represser + inducer ? Inactive repressor
Q12 | In relation of lac operon in E-coli , Which protein is not regulated by the repressor ?
  • Tryptophan
  • galactosidase
  • Lactose permease
  • Transacetylase
Answer: Tryptophan
Q13 | Which is not correct regarding the activity of helicase during DNA replication ?
  • Cuts hydrogen bomds
  • Requires ATP
  • separates DNA strands
  • Stabilizes single strands
Answer: separates DNA strands
Q14 | Which of the following enzyme is not produced by E. coli during lactose catabolism ?
  • ? - galactosidase
  • Thioglactoside translacetylase
  • Lactose dehydrogenase
  • Lactose permease
Answer: Lactose dehydrogenase
Q15 | Which is the incorrect statement regarding HGP ?
  • HGP is an Indian scientific research project
  • In 1990, the Project was initiated
  • A working draft of the genome was announced in 2000
  • In February 2001, the analysis of the working draft was published
Answer: HGP is an Indian scientific research project
Q16 | Humans have approximately _____ times more genes than E.coli
  • 8
  • 15
  • 100
  • 50
Answer: 50
Q17 | Which of the following is not according to the chargoff’s rule ?
  • A = T
  • C = G
  • A + G = T + C
  • A + T / G + C =1
Answer: A + T / G + C =1
Q18 | Select the correct answer / answers from the following1. Ligase :- Joins short segments of DNA together2. DNA Polymerase :- cuts DNA at specific sequence3. Helicase :- Breaks the hydrogen bonds between complementary pairs during DNA replication4. Gyrase : - Joins weak hydrogen bonds between complementary pairs
  • 1, 2, 3 and 4, are corrent
  • 1 and 2 are correct, 3 and 4 are false
  • 1 and 3 are correct, 2 and 4 false
  • 1, 2, 3 are correct, 4 is false
Answer: 1 and 3 are correct, 2 and 4 false
Q19 | DNA replication in eukaryotes is
  • Unidirectional with many origin
  • Bidirectional with many origin
  • Unidirectional with single origin
  • Bidirectional with single origin
Answer: Bidirectional with many origin
Q20 | Aminoacids lysine, serine and arginine are coded by how many codons ?
  • 6, 4, and 3 respectively
  • 4, 2 and 2 respectively
  • 6 codons
  • 4 codons
Answer: 6 codons
Q21 | Which of the following amino acid is coded by 3 codons ?
  • serine
  • Proline
  • Tryptophan
  • Isoleucine
Answer: Isoleucine
Q22 | How many nucleotides make one okazaki segment in eukaryotes ?
  • 1000-1500
  • 100-200
  • 5000
  • Not fixed
Answer: 1000-1500
Q23 | Which of the following enzymes help in the process of formation of phosphodiester bond during reverse transcription ?
  • DNA - dependant RNA polymerase
  • DNA dependant DNA polymerase
  • RNA - dependant RNA polymerase
  • RNA - dependant DNA polymerase
Answer: RNA - dependant DNA polymerase
Q24 | The two strands of a DNA molecule are separted and one of them is analysed for its A + T / G + C ratio, This is found to be 0.2 What is the A + T / G + C ratio of the other strand
  • 0.02
  • 0.08
  • 0.8
  • 0.2
Answer: 0.2
Q25 | DNA replication in lagging strand of most of the eukaryotic organis ms is
  • conservative and continuous
  • semi conservative but discontinuous
  • conservative and semi - discontinuous
  • semi conservative but continuous
Answer: semi conservative but discontinuous
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