Which one of the following is commonly used in the transfer of foreign DNA into crop plants?
1. Trichoderma harzianum
2. Meloidogyne incognita
3. Agro bacterium tumefaciens
4. Penicillium expansum
Removal of introns and joining the exons in a defined order in a transcription unit is called:
| 1. | splicing | 2. | tailing |
| 3. | transformation | 4. | capping |
Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a triplet?
1. Nirenberg and Matthaei
2. Hershey and Chase
3. Morgan and Sturtevant
4. Beadle and Tatum
Seminal plasma in humans is rich in:
| 1. | fructose, calcium and certain enzymes |
| 2. | fructose and calcium but has no enzymes |
| 3. | glucose and certain enzymes but has no calcium |
| 4. | fructose and certain enzymes but poor in calcium |
Phylogenetic system of classification is based on:
1. evolutionary relationships
2. morphological features
3. chemical constituents
4. floral characters
Synapsis occurs between:
| 1. | a male and a female gamete |
| 2. | mRNA and ribosomes |
| 3. | spindle fibres and centromere |
| 4. | two homologous chromosomes |
Which one of the following pair of animals comprises 'jawless fishes'?
| 1. | Lampreys and eels |
| 2. | Mackerals and rohu |
| 3. | Lampreys and hagfishes |
| 4. | Guppies and hagfishes |
Select the incorrect statement from the following:
| 1. | linkage is an exception to the principle of independent assortment in heredity |
| 2. | galactosemia is an inborn error of metabolism |
| 3. | small population size result in random genetic drift in a population |
| 4. | baldness is a sex-limited trait |
The cell junctions called tight, adhering and gap junctions are found in:
1. muscular tissue
2. connective tissue
3. epithelial tissue
4. neural tissue
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?
1. Phytoplankton
2. Fish
3. Zooplankton
4. Frog
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