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 |
The first phase of translation is:
1. Recognition of DNA molecule
2. Aminoacylation of tRNA
3. Recognition of an anti-codon
4. Binding of mRNA to ribosome
Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?
| (a) | Darwin's Finches of Galapagos islands |
| (b) | Herbicide resistant weeds |
| (c) | Drug resistant eukaryotes |
| (d) | Man-created breeds of domesticated animals like dogs |
1. (a) and (c)
2. (b), (c) and (d)
3. only (d)
4. only (a)
From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask:
| 1. | |
| 2. | |
| 3. | |
| 4. |
Flippers of Penguins and Dolphins are examples of:
1. Convergent evolution
2. Industrial melanism
3. Natural selection
4. Adaptive radiation
Embryological support for evolution was disapproved by:
1. Alfred Wallace
2. Charles Darwin
3. Oparin
4. Karl Ernst von Baer
Match the following microorganism with product
| Column -I | Column- II |
| (a) Clostridium butylicum | (i) Cyclosporin A |
| (b) Trichoderma polysporunt | (ii) Butyric acid |
| (c) Monascus purpureus | (iii) Citric acid |
| (d) Aspergillus niger | (iv) Blood cholesterol lowering agent |
| (a) | (b) | (c) | (d) | |
| (1) | (ii) | (i) | (iv) | (iii) |
| (2) | (i) | (ii) | (iv) | (iii) |
| (3) | (iv) | (iii) | (ii) | (i) |
| (4) | (iii) | (iv) | (ii) | (i) |
Which of the following is put into Anaerobic sludge digester for further sewage treatment ?
(1) Floating debris
(2) Effluents of primary treatmet
(3) Activated sludge
(4) Primary sludge
By which method was a new breed 'Hisardale' of sheep found by using Bikaneri ewes and Marina rams?
1. Mutational breeding
2. cross breeding
3. Inbreeding
4. Out crossing
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