why Leptotene stage is also called BOUQUET stage.?

Why is karyotype done at metaphase?

why can plant cells withstand much greater changes in the surrinding medium than animal cells?

WHAT ARE TRANSOSOMES?

 please give points on fluid mosaic model ! 

structure of prokaryotic cell??

 what r microsomes?

enlist any five different processes of our daily life showing exosmosis.

What do we mean by anabollic and catabollic reaction?