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Q. No.In tryptophan operon
1. Non-proteinaceous aporepressor is synthesised by R-gene
2. Normally chorismic acid is not converted into tryptophan
3. Repression is mostly connected with a catabolic pathway
4. Enzymes produced by structural genes normally present in the cell
Subtopic: Gene Regulation: Lac Operon |
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Which of the following DNA forms has maximum number of base pairs per turn?
1. A-DNA
2. B-DNA
3. C-DNA
4. Z-DNA
1. A-DNA
2. B-DNA
3. C-DNA
4. Z-DNA
Subtopic: The DNA | DNA Double Helix |
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Non-histone proteins
1. Are of five types
2. Are involved in nucleosome formation
3. Control gene expression
4. Are basic proteins
1. Are of five types
2. Are involved in nucleosome formation
3. Control gene expression
4. Are basic proteins
Subtopic: DNA Packaging |
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Subtopic: DNA Replication |
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How many types of DNA polymerases are associated with eukaryotic cell?
1. Three
2. Four
3. Five
4. Two
1. Three
2. Four
3. Five
4. Two
Subtopic: DNA Replication |
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Find the incorrect match
| 1. | Central dogma | : | F. Crick |
| 2. | Reverse central dogma | : | Temin and Baltimore |
| 3. | Split genes | : | Kornberg |
| 4. | mRNA | : | Jacob and Monad |
Subtopic: The DNA | Transcription |
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Recognition sequence for transcription in prokaryotes is
1. TATATAT
2. TATAAT
3. TATAAAT
4. CAAT
1. TATATAT
2. TATAAT
3. TATAAAT
4. CAAT
Subtopic: Translation |
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In the mitochondrial DNA, UGA codes for
1. Chain termination
2. Chain initiation
3. Tryptophan
4. Tyrosine
1. Chain termination
2. Chain initiation
3. Tryptophan
4. Tyrosine
Subtopic: Genetic Code |
From NCERT
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Tryptophan operon is
1. Catabolic system
2. Repressible system
3. Inducible system
4. Having three structural genes
1. Catabolic system
2. Repressible system
3. Inducible system
4. Having three structural genes
Subtopic: Gene Regulation: Lac Operon |
56%
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The synthesis of DNA is discontinuous on one strand of the replication fork because:
| 1. | DNA molecule being synthesised is very long |
| 2. | DNA-dependent DNA polymerase catalyse polymerisation only in one direction \((5' \rightarrow 3')\) |
| 3. | It is a more efficient process |
| 4. | It help to use DNA ligase |
Subtopic: The DNA | DNA Double Helix |
90%
From NCERT
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