THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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UAC
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UGG
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UGA
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UCA
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Detailed explanation-1: -The end of the protein-coding message is signaled by the presence of one of three codons (UAA, UAG, or UGA) called stop codons (see Figure 6-50). These are not recognized by a tRNA and do not specify an amino acid, but instead signal to the ribosome to stop translation.
Detailed explanation-2: -The presence of a stop codon-UAA, UAG or UGA-in the A site of the ribosome is generally a signal to terminate protein synthesis.
Detailed explanation-3: -There are 3 STOP codons in the genetic code-UAG, UAA, and UGA. These codons signal the end of the polypeptide chain during translation. These codons are also known as nonsense codons or termination codons as they do not code for an amino acid.
Detailed explanation-4: -Stop codons (UAA, UAG or UGA) are recognized by release factors which bind into the A-site and use an activated water molecule to hydrolyze the ester linkage between the completed polypeptide and tRNA.
Detailed explanation-5: -UAA, UAG and UGA are the stop codons, and do not code for amino acids. They are also known as termination codons or nonsense codons, and act as signals on the mRNA to stop protein synthesis.