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stop codon on mRNA
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∙ 9y ago
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When does the polypeptide stop growing?
It reaches a stop codon on the mRNA molecule
A stop codon on an mRNA molecule does not code for any?
amino acid
What is the sequence of events in translation?
1 ribosomes bind to mRNA 2 Amino acid-carrying tRNA molecules bind to mRNA 3 the polypeptide elongates as new amino acids are added 4 a stop codon on the mRNA is reached 5 the polypeptide is released 6 the ribosomes dissociate from the mRNA plato=C
What would happen if during translation of a protein the mRNA codon UAA sequence was presented?
This is a stop codon. The polypeptide would be completed here and would detach from the ribosome.
What is the difference between codon and anticodon?
A codon is the triplet sequence in the messenger RNA (mRNA) transcript which specifies a corresponding amino acid (or a start or stop command). An anticodon is the corresponding triplet sequence on the transfer RNA (tRNA) which brings in the specific amino acid to the ribosome during translation. The anticodon is complementary to the codon, that is, if the codon is AUU, then the anticodon is UAA. There are no T (Thymine) nitrogen bases in mRNA. It's replaced by U (Uracil).
When does the polypeptide stop growing?
It reaches a stop codon on the mRNA molecule
If an mRNA is made up of 60 bases how many codons does it contain and how many amino acid does it code for?
A codon is exactly three bases long, so an mRNA strand with 60 bases would contain 20 codons. The first codon will encode for methionine (this is called the "start" codon) and the last codon will be a "stop" codon, which does not encode for an amino acid. Thus, an mRNA strand of 60 bases will code for 19 amino acids. Keep in mind, it is possible for a stop codon to be anywhere on the mRNA strand, and when a stop codon reaches the ribosome, translation must stop. For example, if an mRNA strand contained 30 codons, and the 15th were a stop codon, the mRNA would only code for 14 amino acids and then be done. The other 15 codons would go untranslated.
A stop codon on an mRNA molecule does not code for any?
amino acid
What is the sequence of events in translation?
1 ribosomes bind to mRNA 2 Amino acid-carrying tRNA molecules bind to mRNA 3 the polypeptide elongates as new amino acids are added 4 a stop codon on the mRNA is reached 5 the polypeptide is released 6 the ribosomes dissociate from the mRNA plato=C
What is the third codon in the mrna you produce in?
What the third codon is differs depending on the type of mRNA used for translation. The one thing that all translations have in common is that they all start with methionine (AUG), the start codon, and end with one of several stop codons. Everything in between is determined by the mRNA.
Which mRNA codons will start the process of translation?
If you're referring to stop codons, then there are three: UAA, UAG and UGA. They do indeed stop translation, though I wouldn't say they halt ribosomes. Stop codons code for a releaser enzyme, one that fits the A site of the ribosome, but does not carry an amino acid. This enzyme cuts the bond between the polypeptide and the last tRNA.
Which molecules match mRNA codons to specific amino acids?
Starting from the translation start codon in the mRNA molecule, each three bases corresponds to a single amino acid, until you reach the stop signal. Some amino acids have more that one triplet that codes for them (redundancy). Some parts of the mRNA molecule are untranslated and therefore do not correspond to amino acids.
Why is UAG codon called amber codon?
The UAG codon is a special kind of codon called a stop codon. There are three types of stop codons: amber, ochre, and opal. UAG is an mRNA codon that is specific for the amber stop codon. The amber codon was named after Harris Bernstein, then a Caltech graduate student, whose last name means "amber" in German. The related link points to an article that discusses the history a bit more.
What is the three nucleotide?
Messenger RNA (mRNA) serves as the primary transcript, and its nucleotide sequence determines the amino acid sequence of proteins. A codon in mRNA comprises of three nucleotides that encode a specific amino acid. For example, the codon for glutamine is CAG (Cytosine, Adenine and Guanine). The most common stop and start codon is TAA and AUG respectively.
What would happen if during translation of a protein the mRNA codon UAA sequence was presented?
This is a stop codon. The polypeptide would be completed here and would detach from the ribosome.
A mutation within a gene that will insert a premature stop codon in mRNA would?
Most likely result in mRNA that could not be translated and thus would not give rise to any proteins
What is a good description of messenger RNA?
mRNA codons pair with the template strand of DNA in order to make a molecule of mRNA that will move out of the nucleus to a ribosome in order to be translated into a sequence of amino acids that will make a protein. Each mRNA codon represents an amino acid, or a stop or start codon.
