Select Chapter Topics:
Q. No.| Assertion (A): | The newly formed mRNA has the same sequence as the coding stand of transcriptional unit with uracil present in place of thymine. |
| Reason (R): | The rule of complementarily guides the formation of DNA and RNA. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (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: DNA Double Helix |
54%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
| Assertion (A): | DNA has two chains having antiparallel polarity. |
| Reason (R): | In one chain of DNA at one end has a free phosphate moiety 5' end of ribose sugar and at other end the ribose has a free 3' OH group. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true and (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: DNA Double Helix |
51%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Which of the following is always true concerning the base composition of DNA?
| 1. | In each single strand, the number of adenine residues equals the number thymine residues. |
| 2. | In each single strand, the number of adenine residues equals the number of guanine residues. |
| 3. | In a molecule of double stranded DNA, the ratio of adenine residues to thymine residues equals the ratio of cytosine residues to guanine residues. |
| 4. | In a molecule of double stranded DNA, the number of adenine residues plus thymine residues equals the number of cytosine residues plus guanine residues. |
Subtopic: DNA Double Helix |
53%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Which of the following will directly support the conclusion derived by Oswald Avery, Colin MacLeod and Maclyn McCarty that DNA caused the bacterial transformation in Griffith’s experiment?
| I: | Protein-digesting enzymes (proteases) and RNA-digesting enzymes (RNases) did not affect transformation |
| II: | Digestion with DNase inhibited transformation. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Search for Genetic Material |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
In the Meselson-Stahl experiment on DNA replication, after one round of replication in 14N medium following growth in 15N medium, what is the ratio of DNA with intermediate density to DNA with light density?
1. 2:0
2. 1:1
3. 3:1
4. 1:3
1. 2:0
2. 1:1
3. 3:1
4. 1:3
Subtopic: Search for Genetic Material |
50%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Why is a capsule advantageous to a bacterium?
| 1. | It protects the bacterium from desiccation |
| 2. | It provides means of locomotion |
| 3. | It allows the bacterium to "hide" from the host's immune system. |
| 4. | It allows the bacterium to attach to the surface |
Subtopic: Search for Genetic Material:I |
From NCERT
NEET - 2013
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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. |
1. Only I is correct
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
Please attempt this question first.
Hints
Please attempt this question first.
‘‘It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material’’ (Watson and Crick, 1953). What will be true regarding he statement quoted?
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: | The ‘specific pairing’ refers to complementary base pairing. |
| II: | The ‘possible copying mechanism’ refers to conservative mechanism of DNA replication. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: DNA Replication |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
During DNA replication, the proofreading activity of DNA polymerase ensures high fidelity of the newly synthesized strand. This proofreading function is due to the:
1. 5' to 3' polymerase activity
2. 3' to 5' exonuclease activity
3. 5' to 3' exonuclease activity
4. Helicase activity
1. 5' to 3' polymerase activity
2. 3' to 5' exonuclease activity
3. 5' to 3' exonuclease activity
4. Helicase activity
Subtopic: DNA Replication |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The enzyme present in most RNA viruses that enables them to synthesize more viral RNA on the template of viral RNA is:
1. Reverse transcriptase
2. Viral nuclease
3. Restriction endonuclease
4. RNA polymerase
1. Reverse transcriptase
2. Viral nuclease
3. Restriction endonuclease
4. RNA polymerase
Subtopic: Transcription |
Please attempt this question first.
Hints
Select Chapter Topics:
© 2025 GoodEd Technologies Pvt. Ltd.