quiz online uji nyali 2 biologi dasar II

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quiz online uji nyali 2 biologi dasar II
QUIZ ONLINE UJI NYALI MENGHADAPI KUIS MINGGUAN 2 BIOLOGI DASAR II: Pengaturan Ekspresi gen & rekayasa gen serta proyek human genome

  
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  • 1. 
    The flow of genetic material in microbial cells usually proceeds from
    • A. 

      Proteins through RNA to DNA

    • B. 

      RNA through DNA to proteins

    • C. 

      DNA through RNA to proteins


  • 2. 
    The final step in gene expression is protein synthesis, or
    • A. 

      Translation

    • B. 

      Transcription

    • C. 

      Replication


  • 3. 
    Another name for the three stop codons which aid in termination of translation is
    • A. 

      Nonsense codons

    • B. 

      Missense codons

    • C. 

      Pause codons


  • 4. 
    Another name for the RNA polymerase recognition/binding site upstream of a gene is the
    • A. 

      Promoter

    • B. 

      Terminator

    • C. 

      Facilitator


  • 5. 
    Mutations that arise without exposure to external agents are called
    • A. 

      Induced mutations

    • B. 

      Analogous mutations

    • C. 

      Spontaneous mutations


  • 6. 
    A mutagen is
    • A. 

      A chemical or physical agent that induces mutations

    • B. 

      An enzyme that repairs mutations

    • C. 

      A molecule which stabilizes DNA thus prevents mutations from occurring


  • 7. 
    A mutation that affects only a single nucleotide is called
    • A. 

      A regional mutation

    • B. 

      A site mutation

    • C. 

      A point mutation


  • 8. 
    Which form of RNA acts as a blueprint for polypeptide biosynthesis by the ribosome?
    • A. 

      MRNA

    • B. 

      TRNA

    • C. 

      RRNA


  • 9. 
    RNA is synthesized under the direction of DNA by this enzyme
    • A. 

      DNA polymerase

    • B. 

      DNA ligase

    • C. 

      RNA polymerase


  • 10. 
    Which regions of interrupted genes code for RNA that will be present in the final RNA product?
    • A. 

      Introns

    • B. 

      Exons

    • C. 

      Promoter


  • 11. 
    Most procaryotic proteins begin with this modified amino acid
    • A. 

      N-formylleucine

    • B. 

      N-formylmethionine

    • C. 

      N-formylserine


  • 12. 
    The most common initiator codon is
    • A. 

      GUA

    • B. 

      UAA

    • C. 

      AUG


  • 13. 
    Which part of translation involves the addition of amino acids to an existing polypeptide chain?
    • A. 

      Initiation

    • B. 

      Elongation

    • C. 

      Termination


  • 14. 
    What molecule catalyzes the transpeptidation reaction?
    • A. 

      Peptidyl transferase

    • B. 

      RNA polymerase

    • C. 

      DNA ligase


  • 15. 
    Aminoacyl-tRNA binds to which site of the ribosome during elongation?
    • A. 

      P site

    • B. 

      A site

    • C. 

      E site


  • 16. 
    Enzymes that recognize and cleave specific 4 to 8 base pair sequences
    • A. 

      DNA ligase

    • B. 

      Helicases

    • C. 

      Restriction endonucleases


  • 17. 
    Vectors are:
    • A. 

      Molecules that degrade nucleic acids

    • B. 

      Molecules that are able to covalently bond to and carry foreign DNA into cells

    • C. 

      Molecules that protect host cells from invasion by foreign DNA


  • 18. 
    The enzyme used to covalently bond foreign DNA to a vector plasmid  
    • A. 

      DNA polymerase

    • B. 

      Restriction endonuclease

    • C. 

      DNA ligase


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