Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

The method developed by Eli Lilly using R-DNA technology has received great support from diabetic patients. Explain, how?

Write any five common antibiotics with their sources.

DNA being hydrophilic, cannot pass through the cell membrane of a host cell. Explain how the recombinant DNA gets introduced into the host cellto transform the latter.

Your classmate complains of headache and cough. The doctor confirms that he is suffering from Pneumonia and not common cold, on the basis of certain symptoms. List these symptoms. Mention any two precautions to be followed to prevent the spread of this disease.

What is the role of cervix in the human female reproductive system?

Following the collision of two trains a large number of passengers are killed. A majority of them are beyond recognition. Authorities want to hand over the dead to their relatives. Name a modern scientific method and write the procedure that would help in the identification of kinship.

In the 1950s, there were hardly any mosquitoes in Delhi. The use of pesticide DDT on standing water killed their larvae. It is believed that now there are mosquitoes because they evolved DDT resistance through the interaction of mutation and Natural selection. Pointwise, state in a sequence how that could have happened.

The diversity of plants and animals is not uniform throughout the world but shows a rather uneven distribution. Explain with example.