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Q. No.
Assertion (A):
Primary transcripts in eukaryotes are non-functional.
Reason (R):
Methyl guanosine triphosphate is attached to 5' -end of hnRNA.
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.
(A) is false but (R) is true.
Subtopic: Transcription: IV |
62%
From NCERT
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The length of DNA is:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | usually defined as number of nucleotides (or a pair of nucleotide referred to as base pairs) present in it. |
| II: | is the characteristic of an organism. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: The DNA |
79%
From NCERT
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Consider the given two statements:
| Statement I: | A nitrogenous base is linked to the OH of 1'C pentose sugar through a N-glycosidic linkage to form a nucleoside. |
| Statement II: | When a phosphate group is linked to OH of 5'C of a nucleoside through phosphoester linkage, a corresponding nucleotide (or deoxynucleotide depending upon the type of sugar present) is formed. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is incorrect; Statement II is incorrect |
| 3. | Statement I is correct; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: The DNA |
88%
From NCERT
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In the given diagram:
1. Only I and II are correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II, and III are incorrect
| I: | A is 3’-5’ direction. |
| II: | B is hydrogen bond. |
| III: | C is phosphodiester bond. |
1. Only I and II are correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II, and III are incorrect
Subtopic: DNA Double Helix |
64%
From NCERT
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Deoxythymidine is:
| 1. | a substituted pyrimidine found only in DNA |
| 2. | a nucleoside monophosphate found only in DNA |
| 3. | a nucleoside found in DNA |
| 4. | a nucleotide formed by chemical modifications in a RNA nucleotide |
Subtopic: DNA Double Helix |
54%
From NCERT
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When compared to DNA, in RNA:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | every nucleotide residue has an additional –OH group present at 3'-position in the ribose. |
| II: | 5-methyl uracil is found instead of thymine. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: DNA vs RNA as Genetic Material |
From NCERT
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In 1953, James Watson and Francis Crick, proposed a very simple but famous Double Helix model for the structure of DNA, based on the X-ray diffraction data produced by:
| 1. | Maurice Wilkins and Rosalind Franklin |
| 2. | Beadle and Tatum |
| 3. | Temin and Baltimore |
| 4. | Avery–MacLeod–McCarty |
Subtopic: DNA Double Helix |
94%
From NCERT
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“For a double stranded DNA, the ratios between Adenine and Thymine and Guanine and Cytosine are constant and equals one” – this statement is known as:
1. Central dogma of molecular biology
2. Chargaff’s rule
3. Tetra-nucelotide hypothesis by Levene
4. Genetic equilibrium
1. Central dogma of molecular biology
2. Chargaff’s rule
3. Tetra-nucelotide hypothesis by Levene
4. Genetic equilibrium
Subtopic: DNA Double Helix |
95%
From NCERT
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Consider the given two statements:
| Assertion (A): | If the sequence of bases in one strand of the dsDNA molecule is known then the sequence in other strand can be predicted. |
| Reason (R): | The base pairing in a dsDNA molecule is complementary to each other. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: DNA Double Helix |
86%
From NCERT
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How many of the given features will be true for of the double-helix structure of DNA?
1. 1
2. 2
3. 3
4. 4
| I: | It is made of two polynucleotide chains |
| II: | The backbone is constituted by sugar-phosphate |
| III: | The two chains have anti-parallel polarity. |
| IV: | The bases in two strands are paired through hydrogen bonds (H-bonds) forming base pairs (bp) |
2. 2
3. 3
4. 4
Subtopic: DNA Double Helix |
92%
From NCERT
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