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प्रश्न
Which of the following is true with respect to AUG?
विकल्प
It codes for methionine only
It is an initiation codon
It codes for methionine in both prokaryotes and eukaryotes
All of the above
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उत्तर
All of the above
Explanation:
The codon AUG is unique because it serves as the universal initiation codon, signalling the ribosome to begin the process of translation. Beyond its role as a “start” command, it is the only codon that codes for the amino acid methionine, ensuring that this specific building block is the first one incorporated into most protein chains. This function is highly conserved across the tree of life, as AUG codes for methionine in both prokaryotes and eukaryotes, though prokaryotes use a slightly modified version called fMet for the starting position.
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संबंधित प्रश्न
Which one of the following is a stop codon?
(a) UAG
(b) UAC
(c) AUG
(d) UCA
List two essential roles of ribosomes during translation.
Ribosomes are composed of two subunits; the smaller subunit of a ribosome has a binding site for _________ and the larger subunit has two binding sites for two __________.
An operon is a ______.
The translation termination triplet is ______.
The three codons which result in the termination of polypeptide chain synthesis are ______.
During translation, activated amino acids get linked to tRNA. This process is commonly called as ______.
Which of the following life processes is evolved around RNA?
In an mRNA molecule, untranslated regions (UTRs) are present at ______.
UTRs are the untranslated regions present on ______.
Regulation of gene expression occurs at the level of ______.
Which cellular process is shown below?
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.
The first phase of translation is ______
The process of translation is ______.
(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?
Explain the process of aminoacylation of tRNA and its role in the process of translation.
How does initiation of the translation process occur in prokaryotes? Explain.
Where are the untranslated regions located on mRNA and why?
How many different proteins does the ribosome consist of?
