Il vacuolo è una cavità citoplasmatica contenente acqua e soluti, delimitata da una membrana; le vescicole con funzione di trasporto, sono piccole e hanno una struttura uguale al vacuolo
La cellula è l'unità funzionale di base costituita da una membrana esterna, da un mezzo liquido in cui sono immersi gli organuli e da un nucleo; ci sono molte analogie tra cellule eucariote ed procariote.
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When I first read Anne Frank's 'Diary of a Young Girl,' I saw for the first time that a girl could be a writer and that it had something to do with survival and with ethics and fighting against evil. I admired her, though her diary remained terrifying and mysterious to me. She was a character in a real fairy tale - fairy tales are brutal.
When people say, 'How did you start in comedy,' I say my family was kidnapped by ninjas when I was very young, and to get them released I had to do a killer five-minute set. And even after I did that, you know, I started doing comedy under tough circumstances, I still kept at it because I enjoyed it.
Obama has been perhaps the most partisan President since Truman. He hasn't learned to be civil - note his insulting speech to Paul Ryan, who did us the courtesy of scoring a budget. The president has to talk to Republicans when it comes to the debt ceiling. He has reached the debt ceiling before anyone expected.
I think that nothing is impossible when you want to fulfill a dream. A lot of people will tell you that you can't do it, that you don't have what it takes, but if it is in your heart and you feel it, there is nothing that will stop you. It is like the sun - you can't block it: it will shine regardless, if that is what you want.