Bio1334 Genetics - Molecular Genetics - RNA To Proteins (Lecture 3)

18 Questions | Total Attempts: 143

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Bio1334 Genetics - Molecular Genetics - RNA To Proteins (Lecture 3)

Demonstrate a sound knowledge of the principles of mRNA translation and protein synthesis Demonstrate a sound understanding of the roles of RNA in translation


Questions and Answers
  • 1. 
    How many types of amino acids are in proteins?
  • 2. 
    Fill in the gap:The genetic code is said to be ___________, because in most cases several codons specify the same amino acid.
  • 3. 
    How do we know the genetic code is not over-lapping?
    • A. 

      Single base mutations only ever affect one amino acid.

    • B. 

      Single base mutations only ever affect one base.

    • C. 

      Single base mutations affect the entire protein.

  • 4. 
    Name the virus used by Crick and Brenner, which affects E. coli, that was used to crack the genetic code.
  • 5. 
    Fill in the blank: Crick and Brenner generated mutants in rII gene of bacteriophage T4 using ________, a planar molecule that intercalates between base pairs in DNA and causes frame-shift mutations.
  • 6. 
    RRNA makes up the ribosome.How many rRNA molecules can be found in the ribosome?
    • A. 

      Four: three in the large subunit, one in the small subunit.

    • B. 

      Four: two in each subunit.

    • C. 

      Three: two in the large subunit, one in the small subunit.

    • D. 

      Three: one in the large subunit, and two in the small subunit.

  • 7. 
    Which of the following items can be found within a ribosome?
    • A. 

      Large ribosomal subunit

    • B. 

      Small ribosomal subunit

    • C. 

      Medium ribosomal subunit

    • D. 

      E site

    • E. 

      A site

    • F. 

      P site

    • G. 

      X site

    • H. 

      Y site

    • I. 

      RRNAs

    • J. 

      TRNAs

    • K. 

      MRNAs

    • L. 

      SnRNAs

  • 8. 
    What is the name given to the first step of translation?
  • 9. 
    What is the name given to the second step of translation?
  • 10. 
    What is the name given to the final step of translation?
  • 11. 
    In which direction is polypeptide synthesis?
    • A. 

      N to C (amino-terminal to carboxy-terminal)

    • B. 

      C to N (carboxyl-terminal to amino-terminal)

    • C. 

      5' to 3'

    • D. 

      3' to 5'

  • 12. 
    The ribosome is a ___________, as it is composed of rRNA which catalyses peptide bond formation.
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