problem1) Answer all the problems:

i) Draw a labelled diagram of Prokaryotic cell.

ii) Distinguish Gram positive and Gram negative cell wall of bacteria.

iii) What is polymerase chain reaction and its application in recombinant DNA technology.

iv) What do you understand by the term ‘Gene’?

v) What is a viroid? .

problem2) prepare a detailed note on structural organization of prokaryotic cells. Distinguish Prokaryotic cell from Emkaryotic cell.

problem3) prepare note on:-

i) Replication of Viruses.

ii) Virus and Vaccine

problem4) Describe molecular structure of a gene and prepare a short note on gene concept.