Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions

Explain the roles of the following with the help of an example each in recombinant DNA technology :

Restriction Enzymes

Explain divergent evolution with two examples. 

What is gene therapy? Name the first clinical case in which it was used.

Why does Bt toxin not kill the bacterium that produces it, but kill the insect that ingests it?

Explain the role of histones in forming a nucleosome.

Give a schematic representation of the transformation of a pro-insulin into insulin.

Write any two biochemical/molecular diagonostic procedures for early detection of viral infection. Explain the principle of any one of them.

Describe the steps that are followed during secondary treatment of sewage.

Draw a label diagram.
Draw a sectional view of the human ovary showing the different stages of developing follicles, corpus luteum, and ovulation.

Answer the following question.
Explain the significance of palindromic nucleotide sequence in the formation of recombinant DNA.

Answer the following question.
Write the use of restriction endonuclease in the formation of recombinant DNA.

Answer the following question.
Describe the roles of heat, primers, and the bacterium Thermus aquaticus in the process of PCR.

Answer the following question.
Explain the various steps involved in the production of artificial insulin.

Draw a sectional view of the human ovary. Label the following parts :

Give a reason why :
Single cloning site is preferred in a vector.

State the medicinal value and the bioactive molecules produced by Penicillium notatum.

State the medicinal value and the bioactive molecules produced by Monascus purpureus.

State the medicinal value and the bioactive molecules produced by Trichoderma polysporum.

Describe the role of high temperature.

Describe the role of primers.