- 1(current)
Q. No.Under conditions where methionine must be the first amino acid, what protein would be coded for by the following mRNA?
5'-CCUCAUAUGCGCCAUUAUAAGUGACACACA-3'
| 1. | pro his met arg his tyrlyscys his thr |
| 2. | met arg his tyrlyscys his thr |
| 3. | met arg his tyrlys |
| 4. | met pro his met arg his tyrlyscys his thr |
Which of the following pairs of codons encode the same amino acid?
| 1. | AUG and AUC | 2. | UAA and UAC |
| 3. | GUA and GUG | 4. | UAG and UAC |
The amino acid sequence for a eukaryotic gene is placed in a plasmid just downstream of a promoter. Which of the following can be the most likely result?
| 1. | The cell would die because of the antigenicity of the eukaryotic proteins. |
| 2. | The prokaryotic cell will demonstrate the eukaryotic processes such as splicing. |
| 3. | An mRNA would form, but would it would be much longer than that formed directly from the template in the original eukaryote. |
| 4. | If the ribosome could bind the mRNA, a polypeptide that is longer than the one from the original eukaryote would be created. |
Identify the correct statements from the given statements and choose the correct option:
| I: | Both prokaryotic and eukaryotic mRNAs have a 5' cap. |
| II: | Only prokaryotic mRNAs are polyadenylated at the 3' end. |
| III: | In prokaryotes, transcription is coupled to translation. |
| IV: | In eukaryotes, RNA splicing occurs after the mRNA is transported into the cytoplasm. |
| V: | RNA splicing requires the formation of a spliceosome. |
| VI: | Both prokaryotic and eukaryotic mRNAs are synthesized by RNA polymerase. |
| 1. | III, V, and VI only |
| 2. | II, III, V, and VI only |
| 3. | I, III, V, and VI only |
| 4. | I, III, IV, V, and VI only |
The correct chronological order of the steps of translation of a prokaryotic mRNA will be:
| I: | attachment of the initiator tRNA onto the start codon |
| II: | binding of the mRNA to small ribosome subunit of a ribosome |
| III: | attachment of the large ribosome subunit to the mRNA |
| IV: | translocation of the ribosome to move a new codon to be in the A site |
| V: | entry of a charged tRNA into the A site |
| 1. | I | II | V | III | IV |
| 2. | II | I | III | V | IV |
| 3. | I | II | III | V | IV |
| 4. | II | I | IV | III | V |
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Consider the following statements:
| I: | The cellular factory responsible for synthesizing proteins is the ribosome. |
| II: | The ribosome also acts as a catalyst for the formation of a peptide bond. |
| III: | The UTRs (untranslated regions) in an mRNA are not required for translation. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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With regard to mature mRNA in eukaryotes:
| 1. | exons and introns do not appear in the mature RNA. |
| 2. | exons appear but introns do not appear in the mature RNA. |
| 3. | introns appear but exons do not appear in the mature RNA. |
| 4. | both exons and introns appear in the mature RNA. |
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In translation, the enzyme amino acyl-tRNA synthetase:
| 1. | synthesizes tRNA |
| 2. | attaches amino acids to tRNA |
| 3. | hydrolyzes excess tRNA molecules |
| 4. | helps tRNA synthesize amino acids |
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- 1(current)
Q. No.
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