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Question
Where are the untranslated regions located on mRNA and why?
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Solution
A translational unit in mRNA is the sequence of RNA that is flanked by the start codon (AUG) and the stop codon and codes for a polypeptide. An mRNA also has some additional sequences that are not translated and are referred as untranslated regions (UTR). The UTRs are present at both 5' -end (before start codon) and at 3' -end (after stop codon). They are required for efficient translation process.
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RELATED QUESTIONS
Which one of the following is a stop codon?
(a) UAG
(b) UAC
(c) AUG
(d) UCA
The process of translation is ______.
UTRs are the untranslated regions present on ______.
Which of the following statements is correct regarding ribosomes?
Which of the following are correct statements for a tRNA molecule?
- It is an adapter molecule.
- Previously called sRNA (soluble RNA)
- tRNA has a codon loop that has bases complementary to the code,
- it also has an amino acid accepter end to which it binds to amino acids.
- It is non-specific for each amino acid.
(a) Identify the polarity of x to x’ in the diagram below and mention how many more amino acids are expected to be added to this polypeptide chain.
(b) Mention the codon and anticodon for alanine.
(c) Why are some untranslated sequences of bases seen in mRNA coding for a polypeptide? Where exactly are they present on mRNA?
How does initiation of the translation process occur in prokaryotes? Explain.
Anticodon loop of tRNA has ______.
What is a triplet codon?
Which site on the ribosome holds the peptidyl-tRNA during translation?
