Which of the following statements is correct?
1. Adenine pairs with thymine through one H-bond.
2. Adenine pairs with thymine through three H-bonds.
3. Adenine does not pair with thymine.
4. Adenine pairs with thymine through two H-bonds.
Choose the correct pair from the following :
| 1. | Polymerases | - | Break the DNA into fragments |
| 2. | Nucleases | - | Separate the two strands of DNA |
| 3. | Exonucleases | - | Make cuts at specific positions within DNA |
| 4. | Ligases | - | Join the two DNA molecules |
Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.
1. Gibberellin
2. Ethylene
3. Abscisic acid
4. Cytokinin
Ray florets have:
| 1. | Superior ovary | 2. | Hypogynous ovary |
| 3. | Half-inferior ovary | 4. | Inferior ovary |
Match the trophic levels with their correct species examples in the green land ecosystem
| Column-I | Column-II | ||
| (a) | Fourth trophic level | (i) | Cow |
| (b) | Second trophic level | (ii) | Vulture |
| (c) | First trophic level | (iii) | Rabbit |
| (d) | Third trophic level | (iv) | Grass |
Select the correct option:
| Options: | (a) | (b) | (c) | (d) |
| 1. | (iii) | (ii) | (i) | (iv) |
| 2. | (iv) | (iii) | (ii) | (i) |
| 3. | (i) | (ii) | (iii) | (iv) |
| 4. | (ii) | (iii) | (iv) | (i) |
Which of the following statements is not correct?
| 1. | The proinsulin has an extra peptide called C-peptide |
| 2. | Functional insulin has A and B chains linked together by hydrogen bonds. |
| 3. | Genetically engineered insulin is produced in E. Coli. |
| 4. | In man, insulin is synthesized as proinsulin. |
Match the following columns and select the correct option.
| Column-I | Column-II | ||
| a. | Bt cotton | (i) | Gene therapy |
| b. | Adenosine deaminase deficiency | (ii) | Cellular defense |
| c. | RNAi | (iii) | Detection of HIV infection |
| d. | PCR | (iv) | Bacillus thuringiensis |
| a | b | c | d | |
| 1. | (iii) | (ii) | (i) | (iv) |
| 2. | (ii) | (iii) | (iv) | (i) |
| 3. | (i) | (ii) | (iii) | (iv) |
| 4. | (iv) | (i) | (ii) | (iii) |
| 1. | Smooth muscles, show branching, found in the walls of the heart |
| 2. | Cardiac muscles, unbranched muscles, found in the walls of the heart |
| 3. | Striated muscles, tapering at both ends attached to the bones of the ribs |
| 4. | Skeletal muscle, shows striations and is closely attached to the bones of the limbs |
Flippers of Penguins and Dolphins are examples of:
| 1. | Convergent evolution | 2. | Industrial melanism |
| 3. | Natural selection | 4. | Adaptive radiation |
Identify the wrong statement with regards to restriction enzyme:
| 1. | They cut the strand at palindromic sites. |
| 2. | They are useful in genetic engineering. |
| 3. | Sticky ends can be joined by using DNA ligases. |
| 4. | Each restriction enzyme functions by inspecting the length of a DNA sequence. |
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