1. the codons that signal the end of a polypeptide chain are called
1. promoters.
2. introns.
3. exons.
4. terminators.
2. which of the following occurs after a codon and anticodon form hydrogen bonds?
1. rrna and protein combine to form a ribosome
2. a three-base sequence binds to a peptide.
3. a dehydration reaction forms a peptide bond.
4. trna carrying an amino acid binds to the ribosome.
3. if cysteine is specified by the codons ugc and ugu, what are the anticodons present on trnas that carry cysteine?
1.tcg and tct
2.tgc and tgt
3.agc and aga
4.acg and aca