a) While cloning vectors, which of the two will be preferred by biotechnologists bacteriophases or plasmids, Justify with reason.
b) Name the first transgenic cow developed and state the improvement in the quality of the product produced by it.

Milk animals are used for producing biological products. Name the first transgenic cow produced.

No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D floats over it. It was observed that the reaction is highly exothermic. Mention any two types of reaction under which above chemical reaction can be classified.

Transgenic animals that produce useful biological products can be created by biotechnology. In 1997 the first transgenic cow was produced. Name the cow and significance of its milk.

Refer to the diagram and answer the following questions: (a) From which is T1 plasmid obtained? (b) Name the enzyme which is involved in step I. (c) What happens in step III? (d) The plant produced is called hybrid or transgenic.

No chemical reaction takes place when granules of a rusty brown solid A re mixed with the powder of another solid B. however, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. it was observed that the reaction is highly exothermic. (a) What could the solids A and B be? (b) What are the products C and D most likely to be? (c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate tthe heat change which takes place. (d) What is the special name of such a reaction? State one use of such a reaction. (e) Name any two types of chemical reaction under which the above reaction can be classified.