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Q. No.Gene expression might be altered at the level of post-transcriptional processing in eukaryotes rather than prokaryotes because of which of the following?
1. Eukaryotic mRNAs get 5' caps and 3' tails.
2. Prokaryotic genes are expressed as mRNA, which is more stable in the cell.
3. Eukaryotic exons may be spliced in alternative patterns.
4. Prokaryotes use ribosomes of different structure and size
Subtopic: Transcription: I | Transcription:II | Translation |
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Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately, what percentage of the nucleotides in this sample will be thymine?
1. 8%
2. 16%
3. 31%
4. 42%
1. 8%
2. 16%
3. 31%
4. 42%
Subtopic: The DNA |
83%
From NCERT
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In the following questions a statement of assertion (A) is followed by a statement of reason (R).
| Assertion (A): | Expressed sequence tags (ESTS) which was used in human genome project it identify all the genes that are expressed as DNA. |
| Reason (R): | Complete DNA sequence is decoded. |
| 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Human Genome Project |
52%
From NCERT
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A:
During transcription DNA strand with 5’-3’ polarity is refered
as coding strand.
R: Coding strand codes for RNA.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Coding strand codes for RNA.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Transcription: I | Transcription:II |
68%
From NCERT
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The "universal" genetic code is now known to have exceptions. Evidence for this can be found if which of the following is true?
| 1. | If UGA, usually a stop codon, is found to code for an amino acid such as tryptophan (usually coded for by UGG only). |
| 2. | If one stop codon, such as UGA, is found to have a different effect on translation than another stop codon, such as UAA. |
| 3. | If prokaryotic organisms are able to translate a eukaryotic mRNA and produce the same polypeptide. |
| 4. | If several codons are found to translate to the same amino acid, such as serine. |
Subtopic: Genetic Code |
From NCERT
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What characteristic of short tandem repeat DNA makes it useful for DNA fingerprinting?
| 1. | The number of repeats varies widely from person to person or animal to animal. |
| 2. | The sequence of DNA that is repeated varies, significantly, from individual to individual. |
| 3. | The sequence variation is acted upon differently by natural selection in different environments. |
| 4. | Every racial and ethnic group has inherited different short tandem repeats. |
Subtopic: DNA Fingerprinting |
From NCERT
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Subtopic: The DNA |
82%
From NCERT
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A mutation that inactivates the regulatory gene of a repressible operon in an E. coli cell would result in
1. continuous transcription of the structural gene controlled by that regulator
2. complete inhibition of transcription of the structural gene controlled by that regulator
3. irreversible binding of the repressor to the operator
4. inactivation of RNA polymerase by alteration of its active site
1. continuous transcription of the structural gene controlled by that regulator
2. complete inhibition of transcription of the structural gene controlled by that regulator
3. irreversible binding of the repressor to the operator
4. inactivation of RNA polymerase by alteration of its active site
Subtopic: Gene Regulation: Lac Operon |
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In the following questions a statement of assertion (A) is followed by a statement of reason (R).
| Assertion (A): | Histones are basic proteins of major importance in packaging of eukaryotic DNA. DNA and histones comprise chromatin, forming the bulk of eukaryotic chromosome. |
| Reason (R): | Histones are of five major types H1, H2A, H2B and H3 and H4 |
| 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: DNA Packaging |
67%
From NCERT
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A:
Exons
and introns are present in split genes.
R: Introns are the information pieces of split genes
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Introns are the information pieces of split genes
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Transcription: I |
66%
From NCERT
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