Multiple Choice Questions

The tRNA anticodon, GAC, is complementary to the mRNA codon with the sequence _____.•CAG•CTG•GAC•CUG•TCG
  • the rules for base pairing between the third base of a codon and tRNA are flexible.
  • a signal-recognition particle that brings ribosomes to a receptor protein in the ER membrane.
  • A-site
  • CUG
Suppose that an error in transcription alters the formation of a single tRNA molecule in a cell. The altered tRNA still attaches to the same amino acid (Phe), but its anticodon loop has the sequence AAU, which binds to the mRNA codon UUA (usually specifying leucine, Leu). What will be the effect on translation in this cell?The altered tRNA will result in an amino acid variant in all copies of the protein.One altered tRNA molecule will be relatively inconsequential because it will compete with many "normal" ones.The altered tRNA will be so unstable that it will not participate in translation.The altered tRNA will cause this mRNA to make only nonfunctioning product.The tRNA-Leu will not be able to enter the ribosome to bind to the UUA codon.
  • One altered tRNA molecule will be relatively inconsequential because it will compete
  • the small subunit of the ribosome recognizes and attaches to the 5' cap of mRNA
  • bonding of the anticodon to the codon and the attachment of amino acids to tRNAs.
  • The entire template molecule is represented in the product.
Accuracy in the translation of mRNA into the primary structure of a polypeptide depends on specificity in theattachment of amino acids to tRNAs.bonding of the anticodon to the codon and the attachment of amino acids to tRNAs.shape of the A and P sites of ribosomes.bonding of the anticodon to the codon.binding of ribosomes to mRNA.
  • many noncoding stretches of nucleotides are present in eukaryotic DNA.
  • It binds to the stop codon in the A site in place of a tRNA.
  • the rules for base pairing between the third base of a codon and tRNA are flexible.
  • bonding of the anticodon to the codon and the attachment of amino acids to tRNAs.
The initiator tRNA attaches at the ribosome's _____ site.•A•translocation•E•P•Q
  • Phosphorylation
  • P
  • complementary to the corresponding mRNA codon
  • The promoter is a nontranscribed region of a gene.
If a mutated DNA sequence produces a protein that differs in one central amino acid from the normal protein, which of the following kinds of mutations could have occurred?A deletion mutation.An addition mutation and a deletion mutation.An addition mutationNone.
  • One addition and one deletion mutation.
  • RNA polymerase AND Aminoacyl-tRNA synthetase
  • The entire template molecule is represented in the product.
  • An addition mutation and a deletion mutation.
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Multiple Choice Questions
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