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Q. No.In the lac operon, the z gene codes for:
| 1. | transacetylase | 2. | the repressor of lac operon |
| 3. | permease | 4. | beta-galactosidase |
Subtopic: Gene Regulation: Lac Operon |
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Which of the following statements are correct with reference to packaging of DNA helix?
Choose the correct answer from the options given below:
| A. | Histones are organized to form a unit of eight molecules called histone octamer. |
| B. | Histones are negatively charged basic proteins. |
| C. | Histones are rich in the basic amino acid residues - lysine and arginine. |
| D. | The positively charged DNA is wrapped around the histone octamer to form nucleosome. |
| E. | The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins. |
Choose the correct answer from the options given below:
| 1. | A, B and D only | 2. | A, C and E only |
| 3. | C, D and E only | 4. | B, D and E only |
Subtopic: DNA Packaging |
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Arrange the following steps of DNA fingerprinting in a correct sequence.
Choose the correct answer from the options given below :
| A. | Isolation of DNA and its digestion by restriction endonucleases. |
| B. | Hybridisation using a labelled VNTR probe. |
| C. | Transferring of separated DNA fragments to synthetic membranes. |
| D. | Detection of hybridised DNA fragments by autoradiography. |
| E. | Separation of DNA fragments by electrophoresis. |
| 1. | A, E, C, B, D | 2. | A, E, B, C, D |
| 3. | A, B, D, C, E | 4. | A, D, B, E, C |
Subtopic: DNA Fingerprinting |
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Which of the following statements are correct with reference to a transcription unit?
Choose the correct answer from the options given below
| A. | transcription unit in DNA is defined primarily by three regions : promoter, structural gene and terminator. |
| B. | The promoter is said to be located towards the 5'-end of the structural gene. |
| C. | The promoter is a DNA sequence that provides binding site for RNA polymerase. |
| D. | The promoter defines the template and coding strands. |
| E. | The terminator is located towards the 3'-end of the coding strand and it defines the end of the process of transcription. |
| 1. | A, B, C, D and E | 2. | B, C, D and E only |
| 3. | A, C, D and E only | 4. | A, B, C and D only |
Subtopic: Transcription |
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Which of the following enzymes synthesizes precursor mRNA ?
1. DNA polymerase
2. RNA polymerase I
3. RNA polymerase II
4. RNA polymerase III
1. DNA polymerase
2. RNA polymerase I
3. RNA polymerase II
4. RNA polymerase III
Subtopic: Transcription |
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Which of the following statements about lac-operon is correct ?
1. Galactose can act as an inducer of lac operon
2. Gene i is constitutively expressed
3. Lactose activates repressor to bind to the operator
4. Genes i, z, y and a share a single common promoter
1. Galactose can act as an inducer of lac operon
2. Gene i is constitutively expressed
3. Lactose activates repressor to bind to the operator
4. Genes i, z, y and a share a single common promoter
Subtopic: Gene Regulation: Lac Operon |
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Which factor is important for termination of transcription?
| 1. | \(\rho\) (rho) | 2. | \(\gamma\) (gamma) |
| 3. | \(\alpha\) (alpha) | 4. | \(\sigma\) (sigma) |
Subtopic: Transcription |
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Histones are enriched with
1. Phenylalanine & Leucine
2. Phenylalanine & Arginine
3. Lysine & Arginine
4. Leucine & Lysine
1. Phenylalanine & Leucine
2. Phenylalanine & Arginine
3. Lysine & Arginine
4. Leucine & Lysine
Subtopic: DNA Packaging |
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Who proposed that the genetic code for amino acids should be made up of three nucleotides?
| 1. | Jacque Monod | 2. | Franklin Stahl |
| 3. | George Gamow | 4. | Francis Crick |
Subtopic: Genetic Code |
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Given below are two statements :
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | Transfer RNAs and ribosomal RNA do not interact with mRNA. |
| Statement II: | RNA interference (RNAi) takes place in all eukaryotic organisms as a method of cellular defence. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Both Statement I and Statement II are correct |
| 4. | Both Statement I and Statement II are incorrect |
Subtopic: Translation Mechanism | Transcription |
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