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Q. No.How many statements given below are correct with respect to plasmids?
Select the correct option.
1. Three
2. Four
3. Two
4. One
| a. | They float freely in the cytoplasm of certain bacterial cells. |
| b. | They have the ability to replicate, independent of the genomic DNA. |
| c. | Herbert Boyer developed a method of removing and reinserting them in the cells. |
| d. | They are circular ssDNA molecules. |
1. Three
2. Four
3. Two
4. One
Subtopic: Â Introduction & History |
From NCERT
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Match column-I with column-II and select the correct option:
1. a(iii), b(i), c(ii), d(iv)
2. a(i), b(ii), c(iii), d(iv)
3. a(iii), b(iv), c(i), d(ii)
4. a(iii), b(iv), c(ii), d(i)
| Column I | Column II | ||
| a. | Restriction endonuclease | (i) | Hind II |
| b. | First recombinant DNA | (ii) | Obtained from strain RY13 |
| c. | First restriction endonuclease | (iii) | Isolated in 1963 |
| d. | EcoRI | (iv) | Developed in 1972 |
1. a(iii), b(i), c(ii), d(iv)
2. a(i), b(ii), c(iii), d(iv)
3. a(iii), b(iv), c(i), d(ii)
4. a(iii), b(iv), c(ii), d(i)
Subtopic: Â Restriction Enzymes: Historical Background |Â Introduction & History |
 83%
From NCERT
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| Assertion (A): | In vitro fertilisation, leading to a 'test-tube' baby, is included under the umbrella of biotechnology |
| Reason (R): | The definition of biotechnology, given by EFB encompasses only modern molecular biotechnology view |
Choose the correct answer from the options given below:
| 1. | (A) is true but (R) is false |
| 2. | (A) is false but (R) is true |
| 3. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are true but (R) is the not the correct explanation of (A) |
Subtopic: Â Introduction & History |
 77%
From NCERT
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Assertion(A): Restriction enzymes cut the strand of DNA to produce sticky ends.
Reason(R): Stickiness of the ends facilitates the action of the enzyme DNA polymerase.
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.
Reason(R): Stickiness of the ends facilitates the action of the enzyme DNA polymerase.
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.
Subtopic: Â Restriction Enzymes - Main Enzymes |Â Cloning Vector |Â Introduction & History |
 61%
From NCERT
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Q. No.
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