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

1. The codons that signal the end of a polypeptide chain are called terminators. The correct option among all the options given is the fourth option or option "4".

2. "A dehydration reaction forms a peptide bond." is the one among the following that occurs after a codon and anticodon form hydrogen bonds. The correct option is the third option or option "3".

3. If cysteine is specified by the codons UGC and UGU, the anticodons present on tRNAs that carry cysteine are ACG and ACA. The correct option among the options given is the fourth option or option "4".

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