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Q. No.Charging of tRNA during translation is necessary for :
1. Binding of anticodons of tRNA to the respective codons of mRNA.
2. Peptide bond formation between two amino acids.
3. Movement of ribosomes from codon to codon.
4. Binding of ribosomes to the mRNA.
Subtopic: Translation |
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If E. coli were allowed to grow in the culture medium for 80 minutes by Matthew Meselson and Franklin Stahl in their experiments, the proportion of light and hybrid density DNA molecule would have been:
1. 87.5% of light density DNA and 12.5% of hybrid density DNA.
2. 75.0% of light density DNA and 25% of hybrid density DNA.
3. 50% of light density DNA and 50% of hybrid density DNA.
4. 12.5% of light density DNA and 87.5% of hybrid density DNA.
1. 87.5% of light density DNA and 12.5% of hybrid density DNA.
2. 75.0% of light density DNA and 25% of hybrid density DNA.
3. 50% of light density DNA and 50% of hybrid density DNA.
4. 12.5% of light density DNA and 87.5% of hybrid density DNA.
Subtopic: DNA Replication |
67%
From NCERT
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A diagramatic illustration of the process of transcription by RNA polymerase-II in eukaryote is given below. Choose the most appropriate statement with respect to the fate of the precursor of mRNA transcribed that will be :
1. Translation will take place once the precursor of mRNA leaves the nucleus.
2. Translation on mRNA will not take place once the precursor of mRNA leaves the nucleus.
3. Translation will take place in the nucleus.
4. The precursor of mRNA has to be processed further in next step before being translated.
1. Translation will take place once the precursor of mRNA leaves the nucleus.
2. Translation on mRNA will not take place once the precursor of mRNA leaves the nucleus.
3. Translation will take place in the nucleus.
4. The precursor of mRNA has to be processed further in next step before being translated.
Subtopic: Transcription |
From NCERT
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Identify the correct pair of codon with its corresponding pair of amino acid :
| 1. | UAA : Leucine |
| 2. | UGA : Serine |
| 3. | AUG : Histidine |
| 4. | UUU : Phenylalanine |
Subtopic: Genetic Code |
88%
From NCERT
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Consider the given two statements:
Assertion: If each strand from a parental DNA acts as a template for synthesis of a new strand, the two
double stranded daughter DNA thus, produced would be identical to the parental DNA molecule.
Reason: For a double stranded DNA, the ratios between Adenine and Thymine and Guanine and Cytosine
are constant and equals one.
| 1. | Both Assertion and Reason are true and Reason correctly explains the Assertion. |
| 2. | Assertion is true but Reason is false. |
| 3. | Both Assertion and Reason are true but Reason does not correctly explain the Assertion. |
| 4. | Assertion is false but Reason is true. |
Subtopic: DNA Double Helix |
57%
From NCERT
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Consider the given two statements:
| Assertion (A): | There is, approximately, a uniform distance between the two strands of the double helix of DNA. |
| Reason (R): | A purine on one strand comes opposite to a pyrimidine on the other strand of the double helix of DNA. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A) |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: DNA Double Helix |
77%
From NCERT
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Consider the given two statements:
| Assertion (A): | Euchromatin is said to be transcriptionally inactive chromatin. |
| Reason (R): | In a typical nucleus, euchromatin is the region of chromatin that is loosely packed and stains light. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: DNA Packaging |
87%
From NCERT
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Consider the given two statements:
| Assertion: | Viruses grown in the presence of radioactive phosphorus will contain radioactive protein but not radioactive DNA. |
| Reason: | DNA contains phosphorus but protein does not. |
| 1. | Both Assertion and Reason are true and Reason correctly explains the Assertion. |
| 2. | Assertion is true but Reason is false. |
| 3. | Both Assertion and Reason are true but Reason does not correctly explain the Assertion. |
| 4. | Assertion is false but Reason is true. |
Subtopic: Search for Genetic Material:I |
86%
From NCERT
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Consider the given two statements:
| Assertion (A): | Among the two nucleic acids, the DNA and the RNA, DNA is a better genetic material. |
| Reason (R): | DNA chemically is less reactive and structurally more stable when compared to RNA. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Search for Genetic Material: II |
95%
From NCERT
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Consider the given two statements:
| Assertion (A): | RNA can directly code for the synthesis of proteins and can easily express the characters. |
| Reason (R): | DNA is dependent on RNA for synthesis of proteins. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A) . |
Subtopic: Search for Genetic Material: II |
76%
From NCERT
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