Q. No.The codons represented as YYY and ZZZ in the given figure, respectively, can be:
1. 5’-AGU-3’ and 5’-UAC-3’
2. 3’-AGU-5’ and 3’-UAC-5’
3. 5’-TCA -3’ and 5’-ATG-3’
4. 3’-TCA -5’ and 3’-ATG-5’
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| A | B | C | D | |
| 1. | Amino acid binding site | DHU loop | Anticodon | TψC loop |
| 2. | Amino acid binding site | TΨC loop | Anticodon | DHU loop |
| 3. | Anticodon | DHU loop | Amino acid binding site | TΨC loop |
| 4. | Anticodon | TΨC loop | Amino acid binding site | DHU loop |
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| Assertion (A): | In the first phase of translation, it is important that the charging of tRNA in the presence of ATP takes place. |
| Reason (R): | The formation of a peptide bond requires energy. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are False. |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
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| Statement I: | The formation seen in the figure is called as polyribosome. |
| Statement II: | Ribosomes of a polyribosome translate different proteins. |
2. Statement I is correct, Statement II is incorrect.
3. Statement I is incorrect, Statement II is correct.
4. Statement I is incorrect, Statement II is incorrect.
| 1. | transcriptional level (formation of the primary transcript) |
| 2. | processing level (regulation of splicing) |
| 3. | transport of mRNA from the nucleus to the cytoplasm |
| 4. | translational level |
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| I: | It is the metabolic, physiological, or environmental conditions that regulate the expression of genes. |
| II: | The development and differentiation of embryos into adult organisms are also a result of the coordinated regulation of the expression of several sets of genes. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
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| Assertion (A): | In a transcription unit, the activity of RNA polymerase at a given promoter is in turn regulated by interaction with accessory proteins. |
| Reason (R): | These regulatory proteins can act both positively (activators) and negatively (repressors). |
| 1. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 2. | Both (A) and (R) are False. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
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| I: | The operator region is adjacent to the promoter elements in most operons and in most cases the sequences of the operator bind a repressor protein. |
| II: | Each operon has its specific operator and specific repressor. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
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| Assertion (A): | Lactose is the inducer of the lac operon in E.coli. |
| Reason (R): | Lactose is the inhibitor of the lac operon. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are False. |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
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| Statement I: | This is the working of a lac operon in the absence of an inducer. |
| Statement II: | Repressor binds to the operator region and allows RNA polymerase to transcribe the operon. |
2. Only Statement II
3. Both Statement I and Statement II
4. Neither Statement I nor Statement II
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