31. Who proposed 3-D helical DNA model?
32. Which of the following are the most important among fossils since they show microscopic tissue structure often to the finest details?
33. Consider the following statements and choose the correct answer:
1. Adenine pairs with thymine (A : T) and guanine with cytosine $$\left( {G \vdots C} \right)$$
2. Adenine and thymine are joined by three hydrogen bonds through atoms
3. Guanine and cytosine are joined by two hydrogen bonds through atoms
4. The weak hydrogen bonding enables the two strands of the DNA to separate during replication
1. Adenine pairs with thymine (A : T) and guanine with cytosine $$\left( {G \vdots C} \right)$$
2. Adenine and thymine are joined by three hydrogen bonds through atoms
3. Guanine and cytosine are joined by two hydrogen bonds through atoms
4. The weak hydrogen bonding enables the two strands of the DNA to separate during replication
34. Triticale, the first man made crop was derived by crossing
35. Consider the following statements regarding the conclusions drawn from fossil records and choose the correct answer:
1. There existed a multitude of diversified animal groups, similar to the animal groups that exist today
2. The most primitive forms of life are found in the oldest rocks
3. None of the past forms of life are exactly like any of those now living
4. All fossils did not appear at a time, but appeared during different great spans of times
1. There existed a multitude of diversified animal groups, similar to the animal groups that exist today
2. The most primitive forms of life are found in the oldest rocks
3. None of the past forms of life are exactly like any of those now living
4. All fossils did not appear at a time, but appeared during different great spans of times
36. Consider the following statements regarding the origin of protobionts (protocells) and choose the correct answer:
1. The self-assembly process is internally controlled by selective intermolecular forces
2. The protocells possessed lipids, nucleic acids and had a definite molecular configuration
3. The protocells were heterotrophic
4. The instructions for the behaviour in the protocellular life-cycle were in the protenoids
1. The self-assembly process is internally controlled by selective intermolecular forces
2. The protocells possessed lipids, nucleic acids and had a definite molecular configuration
3. The protocells were heterotrophic
4. The instructions for the behaviour in the protocellular life-cycle were in the protenoids
37. The unit of DNA responsible for the appearance and inheritance of a character is known as a
38. Who among the following is called the "Father of genetics"?
39. Match the following lists:
List-I (Discoverer)
List-II (Discovery)
a. Jenner
1. Blood grouping
b. Watson
2. Penicillin
c. Landsteiner
3. Vaccination
d. Fleming
4. Double helix
| List-I (Discoverer) | List-II (Discovery) |
| a. Jenner | 1. Blood grouping |
| b. Watson | 2. Penicillin |
| c. Landsteiner | 3. Vaccination |
| d. Fleming | 4. Double helix |
40. Match List-I with List-II and select the correct answer:
List-I
List-II
a. Oenothera lamarckiana
1. Autoallohexaploid
b. North American cotton plant
2. Autotetraploid
c. Triticum vulgare
3. Allohexapioid
d. Solanum nigrum
4. Allotetraploid
| List-I | List-II |
| a. Oenothera lamarckiana | 1. Autoallohexaploid |
| b. North American cotton plant | 2. Autotetraploid |
| c. Triticum vulgare | 3. Allohexapioid |
| d. Solanum nigrum | 4. Allotetraploid |
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