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Q. No.A bacterium that completes its duplication in 20 minutes and has light DNA is now growing in medium containing 15NH4Cl as the only source of nitrogen. After 60 minutes, what percent of the progeny would produce next generation having hybrid DNA when transferred to normal medium?
1. 25%
2. 100%
3. 50%
4. 75%
Subtopic: DNA Replication |
From NCERT
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Phosphodiester linkage in DNA:
| 1. | Joins adenine with ribose sugar |
| 2. | Connects a phosphate group to OH of 5'C of a nucleoside |
| 3. | Forms a nucleoside |
| 4. | Forms a dinucleotide |
Subtopic: The DNA |
62%
From NCERT
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In prokaryotes, the sigma subunit of RNA polymerase:
| 1. | Allows the polymerase to identify the different promoters |
| 2. | Alter the rate of translation |
| 3. | Allows the ribosomal subunit to attach the mRNA |
| 4. | Can change the process of translation in different types of cells |
Subtopic: Transcription |
63%
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How many phosphodiester bonds are present in genetic material of \(\phi\) × 174 bacteriophage?
1. 48501
2. 5385
3. 5384
4. 5386
Subtopic: DNA Double Helix |
68%
From NCERT
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The synthesis of RNA that has the sequence of codes for polypeptide (i.e., a component of haemoglobin), is catalysed by:
1. Primase
2. RNA polymerase III
3. RNA polymerase I
4. RNA polymerase II
1. Primase
2. RNA polymerase III
3. RNA polymerase I
4. RNA polymerase II
Subtopic: Transcription |
55%
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Which of the following statements is true regarding ribozyme?
| 1. | It is a molecule that catalyses the association of two units of a ribosome |
| 2. | It is an enzyme that synthesizes RNA |
| 3. | It is a polymer of ribonucleotides |
| 4. | It is an enzyme using RNA as substrate |
Subtopic: Transcription |
From NCERT
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In eukaryotes, the RNA that has both unwanted base sequence alternated with useful base sequence is synthesized by:
1. Sigma (\(\sigma \)) factor
2. RNA polymerase II
3. Rho (\(\rho\)) factor
4. RNA primase
1. Sigma (\(\sigma \)) factor
2. RNA polymerase II
3. Rho (\(\rho\)) factor
4. RNA primase
Subtopic: Transcription |
67%
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A transcription unit is 7000 nucleotides long. This unit may use A nucleotides to make a polypeptide that can have B amino acids.
Select the correct option to fill in the blanks A and B.
A B
1. 3500 1750
2. 7000 2330
3. 2100 650
4. 1400 500
Select the correct option to fill in the blanks A and B.
A B
1. 3500 1750
2. 7000 2330
3. 2100 650
4. 1400 500
Subtopic: Translation |
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How many different amino acids would be there in the polypeptide translated from the translation unit of given stretch of mRNA?
1. Three
2. Two
3. Five
4. Four
1. Three
2. Two
3. Five
4. Four
Subtopic: Translation |
From NCERT
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Mutation in which of the following parts of a gene will impact most to the activity of a cell?
1. UTR before start codon
2. UTR after stop codon
3. Exon
4. Intron
1. UTR before start codon
2. UTR after stop codon
3. Exon
4. Intron
Subtopic: Transcription |
74%
From NCERT
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