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Q. No.
Given below are two statements:
Assertion (A):
Genetic codons are called degenerate.
Reason (R):
Some amino acids are coded by more than one codon.
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
Subtopic: Genetic Code |
86%
From NCERT
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In the experiments conducted by Griffith on Streptococcus pneumoniae, it is observed that:
| 1. | Mice infected with non-pathogenic strain become resistant to pathogenic stain. |
| 2. | Heat-killed pathogenic strain is responsible for making non-pathogenic to pathogenic ones. |
| 3. | Non-pathogenic strain when mixed with pathogenic strain, the latter is also converted into non-pathogenic. |
| 4. | Mutant strain of bacterium makes the mice mutant also. |
Subtopic: Search for Genetic Material |
83%
From NCERT
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To determine DNA as genetic material, Hershey and Chase labelled
1. DNA with radioactive phosphorus
2. Protein with P32
3. DNA with radioactive sulphur
4. Protein with S32
1. DNA with radioactive phosphorus
2. Protein with P32
3. DNA with radioactive sulphur
4. Protein with S32
Subtopic: Search for Genetic Material |
83%
From NCERT
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How many nucleosomes are present in the nucleus of diploid eukaryotic cell which possess 6.6 x 109 bp?
1. 3.3 x 107
2. 6.6 x 106
3. 6.6 x 108
4. 3.3 x 109
1. 3.3 x 107
2. 6.6 x 106
3. 6.6 x 108
4. 3.3 x 109
Subtopic: DNA Packaging |
64%
From NCERT
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When the Escherichia coli growing in a medium containing 35SO4 are infected with T2 bacteriophage, which of the following results would be observed?
| 1. | Radioactivity will be observed in the supernatant. |
| 2. | The bacteriophage formed in the bacteria will not show radioactivity. |
| 3. | Radioactivity will be seen in the genetic material of the bacteria. |
| 4. | Radioactivity will be seen in the capside of the newly formed bacteriophage. |
Subtopic: Search for Genetic Material |
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During DNA replication, Okazaki fragments are:
1. Continuous strands
2. Produced on template with polarity 3'→5'
3. Produced on template with polarity 5'→3'
4. Also called leading strand
1. Continuous strands
2. Produced on template with polarity 3'→5'
3. Produced on template with polarity 5'→3'
4. Also called leading strand
Subtopic: DNA Replication |
74%
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A primary transcript formed a DNA segment has 13% of the bases as uracil. what percent of the bases in coding strand of DNA is 5-methyl uracil?
1. 26%
2. 37%
3. 13%
4. 12%
1. 26%
2. 37%
3. 13%
4. 12%
Subtopic: DNA Double Helix |
83%
From NCERT
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Which of the following fragments of DNA (for reference only template strand is given) requires more energy for replication?
1. 5' C G A T T A C G 3'
2. 5' A T A C C G A G 3'
3. 5' C C G G A C A G 3'
4. 5' A A T A A A G C 3'
1. 5' C G A T T A C G 3'
2. 5' A T A C C G A G 3'
3. 5' C C G G A C A G 3'
4. 5' A A T A A A G C 3'
Subtopic: DNA Replication |
63%
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DNA replication is different in bacteria as compared to that of human cells because in the former:
| 1. | DNA has a single origin of replication |
| 2. | Four types of deoxyribonucleotides are activated into triphosphate state |
| 3. | Does not require unwinding of helix |
| 4. | A single replication fork is formed |
Subtopic: DNA Replication |
61%
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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%
1. 25%
2. 100%
3. 50%
4. 75%
Subtopic: DNA Replication |
From NCERT
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