Q. No.The mechanism of DNA replication is:
1. Conservative
2. Semi-conservative
3. Dispersive
4. Random
1. Conservative
2. Semi-conservative
3. Dispersive
4. Random
Subtopic: DNA Replication |
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What was the conclusion of the Meselson and Stahl experiment regarding DNA replication?
1. DNA replication is conservative.
2. DNA replication is dispersive.
3. DNA replication is semiconservative.
4. DNA does not replicate; it is inherited as is.
1. DNA replication is conservative.
2. DNA replication is dispersive.
3. DNA replication is semiconservative.
4. DNA does not replicate; it is inherited as is.
Subtopic: DNA Replication |
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At the time of DNA replication, deoxyribonucleoside triphosphate serves dual purposes which are:-
1. These are acting as substrate
2. They provide energy for polymerisation
3. Both 1 and 2
4. None of these
Subtopic: DNA Replication |
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In DNA replication, the Okazaki fragments on the lagging strand are joined together by
1. DNA ligase.
2. DNA polymerase.
3. primase.
4. helicase.
1. DNA ligase.
2. DNA polymerase.
3. primase.
4. helicase.
Subtopic: DNA Replication |
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Isotopes used in proving semiconservative replication of DNA were:
| 1. | 14N 14C | 2. | 14N 15N |
| 3. | 14N 31P | 4. | 14C 31P |
Subtopic: DNA Replication |
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Discontinuous synthesis of DNA occurs in one strand, because:
| 1. | DNA molecule being synthesised is very long |
| 2. | DNA dependent DNA polymerase catalyses polymerisation only in one direction (5’ → 3’) |
| 3. | it is a more efficient process |
| 4. | DNA ligase joins the short stretches of DNA |
Subtopic: DNA Replication |
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In the semi-conservative scheme of DNA replication:
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 two strands separate and act as a template for the synthesis of new complementary strands. |
| II: | After the completion of replication, each DNA molecule would have one parental and one newly synthesised strand. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: DNA Replication |
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Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.
| Statement I: | DNA polymerases catalyse polymerisation only in one direction, that is 5' →3' |
| Statement II: | During replication of DNA, on one strand the replication is continuous while on other strand it is discontinuous. |
1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.
Subtopic: DNA Replication |
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NEET - 2022
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Meselson and Stahl’s experiment using heavy nitrogen (¹⁵N) confirmed that DNA replication follows a semi-conservative model. After one round of replication in ¹⁴N medium, what type of DNA strands were observed?
| 1. | All hybrid strands with one heavy (¹⁵N) and one light (¹⁴N) strand |
| 2. | All strands remained fully heavy (¹⁵N-¹⁵N) |
| 3. | All strands became fully light (¹⁴N-¹⁴N) |
| 4. | A mixture of fully light (¹⁴N-¹⁴N) and fully heavy (¹⁵N-¹⁵N) strands |
Subtopic: DNA Replication |
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The replication of DNA is
1. constitutive and continuous
2. conservative and semi discontinuous
3. semi-constitutive and continuous
4. semi-conservative and semi discontinuous
Subtopic: DNA Replication |
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