Eukaryotic Cells and Hybrid Genomes

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Questions and Answers

What is the function of the three codons that do not specify any amino acid?

  • To specify the start of a protein-coding sequence
  • To code for methionine
  • To recognize and bind to tRNAs
  • To specify the end of a protein-coding sequence (correct)

What is the typical pattern of codons that specify the same amino acid?

  • They vary at all three positions
  • They vary at the third position, and contain the same nucleotides at the first and second positions (correct)
  • They contain the same nucleotides at all three positions
  • They vary at the first and second positions, and contain the same nucleotides at the third position

What is the role of the anticodon in tRNA?

  • To act as a termination site
  • To specify the start of a protein-coding sequence
  • To recognize and bind to the amino acid
  • To pair with the complementary codon in an mRNA molecule (correct)

What is the function of the AUG codon?

<p>It acts as an initiation codon, signaling the start of a protein-coding sequence (A)</p> Signup and view all the answers

What is the length of a typical tRNA molecule?

<p>About 80 nucleotides (D)</p> Signup and view all the answers

What is the role of tRNA molecules in protein synthesis?

<p>To act as an adaptor molecule, recognizing and binding both to the codon and the amino acid (D)</p> Signup and view all the answers

What is the convention for writing codons?

<p>The 5`-terminal nucleotide is written to the left (B)</p> Signup and view all the answers

What is the relationship between the codons that specify the same amino acid?

<p>They have the same nucleotides at the first and second positions, and vary at the third position (D)</p> Signup and view all the answers

What is the function of the initiation codon?

<p>It signals the start of a protein-coding sequence (C)</p> Signup and view all the answers

What is the shape of a tRNA molecule?

<p>An L-shaped molecule (D)</p> Signup and view all the answers

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