Unit 3 Target 4: Translation

11 Questions | Total Attempts: 767

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Unit 3 Target 4: Translation


Questions and Answers
  • 1. 
    Which of the following mRNA sequences codes for valine (Val), glutamic acid (Glu), and serine (Ser), respectively?
    • A. 

      GUA-GCC-AGU

    • B. 

      GUA-GGG-AGC

    • C. 

      GUG-GAC-GGU

    • D. 

      GUG-GAG-AGC

  • 2. 
    The mRNA sequence ACU codes for the amino acid Thr. A mutation occurs, and the resulting mRNA sequence is AUU. What amino aci will replace Thr?
    • A. 

      Val

    • B. 

      Met

    • C. 

      Ile

    • D. 

      Ala

  • 3. 
    Persons A and B have similar mRNA sequences with the exception of 1 nucleotide.        Person A: AUGGUUACUAAGGGCUGA        Person B: AUGGUUACUGAGGGCUGAUse the genetic code chart to determine how this difference affects the sequence of amino acids in the resulting protein.
    • A. 

      Lys in Person A is replaced with Glu in Person B.

    • B. 

      Phe in Person A is replaced with Leu in Person B.

    • C. 

      Persons A and B have identical amino acid sequences.

    • D. 

      A stop codon is generated in Person B and not in Person A.

  • 4. 
    Refer to the illustration above. What is the portion of the protein molecule coded for by a piece of mRNA with the sequence CUCAAGUGCUUC?
    • A. 

      Ser—Tyr—Arg—Gly

    • B. 

      Val—Asp—Pro—His

    • C. 

      Leu—Lys—Cys—Phe

    • D. 

      Pro—Glu—Leu—Val

  • 5. 
    What happens during the process of translation? 
    • A. 

      Messenger RNA is made from DNA.

    • B. 

      The cell uses information from messenger RNA to produce proteins.

    • C. 

      Transfer RNA is made from messenger RNA.

    • D. 

      Copies of DNA molecules are made.

  • 6. 
    During translation, the type of amino acid that is added to the growing polypeptide depends on the 
    • A. 

      Codon on the tRNA only.

    • B. 

      Anticodon on the tRNA to which the amino acid is attached only.

    • C. 

      Codon on the mRNA and the anticodon on the tRNA to which the amino acid is attached.

    • D. 

      Anticodon on the mRNA only.

  • 7. 
    Where does translation occur?
    • A. 

      Nucleus

    • B. 

      Nucleolus

    • C. 

      Cytoplasm

    • D. 

      Ribosome

  • 8. 
    The 3 base sequence found on a tRNA molecule is called a ______. 
    • A. 

      Codon

    • B. 

      Anticodon

    • C. 

      Amino acid

    • D. 

      Polypeptide

  • 9. 
    Which of the following is a STOP codon?
    • A. 

      UCA

    • B. 

      UGG

    • C. 

      UAA

    • D. 

      All of the above

  • 10. 
    How many codons are needed to specify three amino acids?
    • A. 

      3

    • B. 

      6

    • C. 

      9

    • D. 

      12

  • 11. 
    Why is it possible for an amino acid to be specified by more than one kind of codon? 
    • A. 

      Some codons have the same sequence of nucleotides.

    • B. 

      The codon AUG codes for the amino acie methionine and serves as the "start" codon for protein synthesis.

    • C. 

      Some codons do not specify an amino acid.

    • D. 

      There are 64 different kinds of codons but only 20 amino acids.

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