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Which one of the following factors is responsible for activation of protoxin into active Bt toxin of Bacillus thuringiensis?
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Home-made fruit juices are turbid, while the bottled ,fruit juices purchased from the market are clear. Give a reason for this difference.
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The table given below shows the Area, Y-intercept and regression coefficient of the continents namely, Africa and Europe. Study the table carefully and answer the questions that follow:
| Africa | Europe | |
| Area (A) | 62,000 km sq. | 65,000 km sq. |
| Y-intercept | (C) 10 | 20 |
| Regression coefficient (Z) |
1 | 1 |
- Calculate the species richness (S) of each continent.
- Which of these continents shows a higher biodiversity?
- State any two factors that cause an increase in biodiversity.
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Which is the most commonly prescribed non-steroidal oral contraceptive pill in India?
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Read the passage given below carefully and answer the questions that follow:
|
The bacterium Bacillus thuringiensis serovar israelensis (Bti) is commercially prepared in various formulations such as liquid, water dispersible granules, powders, and pellets. It is used as a larvicide all over the world due to its ability to produce a toxic protein that primarily targets the larvae of mosquitoes. In Sweden, Bti has been applied on a large scale in the form of commercially available granular formulation Vecto Bac G (Valent BioScience, USA). The applications have taken place in the lower Dalalven River Area to control mass outbreaks of the floodplain mosquito Aedes sticticus. |
- Why does the toxic protein kill the insects but not the bacterium?
- Can the formulation Vecto Bac G be used to eliminate the species of mosquito referred to above? Why?
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Samson and Dorothy surveyed two islands, ‘A’ and ‘B’. They recorded the relevant data in the following format in their research folder:
| Parameter | Island A | Island B | |
| (a) | Area (A) | 45 × 103 Km2 | 12 × 105 Km2 |
| (b) | Regression co-efficient (Z) | 1 | 1 |
| (c) | Y-intercept | 20 | 10 |
- Derive the species-richness for each island.
- Which island exhibits greater biodiversity? Support your answer with a reason.
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What does PCR stand for? Describe the different steps of PCR
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Give an account of the Blue-White Method of selection of recombinants.
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Name and explain the technique used for separating DNA fragments and making them available for biotechnology experiments.
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Write a short note on Electrophoresis.
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Give the biological name of the following:
Baker’s yeast
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Expand the following abbreviation: BAC
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Give one significant difference between:
Electroporation and Gene Gun.
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What are the restriction endonucleases? Give the rules of their nomenclature.
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Explain the mechanism of action of restriction endonucleases that makes them suitable for genetic engineering.
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Explain what are the desirable characteristics of an ideal cloning vector used in rDNA technology.
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Describe two vectors less methods of gene transfer used in rDNA technology.
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State two advantages of vegetative propagation.
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Why are bio-fertilizers preferred over chemical fertilizers?
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Name and describe the technique that helps in separation of DNA fragments.
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