Which of the following is not true of a codon?-It never codes for more than one amino acid. -It is the basic unit of the genetic code. -It extends from one end of a tRNA molecule. -It consists of three nucleotides. -It may code for the same amino acid as another codon.
  • *several transcription factors have bound to the promoter.
  • *a single nucleotide insertion downstream of, and close to, the start of the coding sequence
  • *It extends from one end of a tRNA molecule.
  • *Exons are cut out before mRNA leaves the nucleus.
Which of the following is not true of RNA processing? -Nucleotides may be added at both ends of the RNA. -RNA splicing can be catalyzed by spliceosomes. -Exons are cut out before mRNA leaves the nucleus. -A primary transcript is often much longer than the final RNA molecule that leaves the nucleus. -Ribozymes may function in RNA splicing.
  • *several transcription factors have bound to the promoter.
  • *Exons are cut out before mRNA leaves the nucleus.
  • *It extends from one end of a tRNA molecule.
  • *a single nucleotide insertion downstream of, and close to, the start of the coding sequence
Which of the following mutations would be most likely to have a harmful effect on an organism? -a deletion of three nucleotides near the middle of a gene -a nucleotide-pair substitution -a single nucleotide deletion in the middle of an intron -a single nucleotide insertion downstream of, and close to, the start of the coding sequence -a single nucleotide deletion near the end of the coding sequence
  • *a single nucleotide insertion downstream of, and close to, the start of the coding sequence
  • *Exons are cut out before mRNA leaves the nucleus.
  • *It extends from one end of a tRNA molecule.
  • *several transcription factors have bound to the promoter.
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