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

I batteri sono cellule procariote; queste cellule sono prive di membrana cellulare e possono vivere anche negli ambienti più estremi.

La parte fluida del citoplasma, il citosol, è una soluzione di ioni, piccole molecole e grosse proteine; nelle cellule eucariote metà del citoplasma è costituito da piccole strutture chiamate organuli.

Tutte le cellule sono rivestite da una membrana cellulare, formata da un doppio strato fosfolipidico; le cellule vegetali hanno anche una parete rigida costituita da cellulosa.

Le cellule Eucariote: hanno dimensioni limitate per favorire il rapporto superficie/volume e rendere le cellule metabolicamente attive.

Il nucleo, avvolto da una doppia membrana dotata di pori per poter comunicare col citoplasma, contiene il DNA sotto forma di cromatina e un nucleolo che assembla i ribosomi.

Il citoscheletro mantiene la forma della cellula, fissa gli organuli, dirige il traffico interno e le consente di muoversi; è formato da filamenti di actina, microtubuli e filamenti intermedi.

Ciglia e flagelli sono formati da filamenti proteici; servono per il movimento.

Il reticolo endoplasmatico è costituito da un sistema di membrane; il reticolo rugoso ricoperto di ribosomi da ribosomi sintetizza le proteine e il reticolo liscio sintetizza soppratutto lipidi.

I lisosomi sono vescicole che racchiudono gli enzimi coinvolti nelle reazioni di idrolisi, i proteasomi sono specializzati nel demolire proteine per riciclare amminoacidi, i perossisomi contengono diversi enzimi ossidativi.

I cloroplasti svolgono la fotosintesi clorofialiana ; nei mitocondri, invece, avviene la respirazione cellullare.

I ribosomi sono sono siti presso cui vengono assemblati gli amminoacidi per la sintesi delle proteine.

L'apparato di golgi è un centro di elaborazione di molecole complesse che vengono poi avvolte in vescicole e trattenute nella cellula stessa o esportate.

I had to go to Europe to tour and he died on the second day of the tour.

I have several books I can read over and over. With fiction, it's 'The Stand' by Stephen King, which is my favorite all time. I read that at least once a year, the version which has 100,000 extra words, which is like the director's cut and unabridged. I love the story. I love the social connotation to it.

I think what the story of Yes has been is we've wandered in and out of different styles over the years.

I love the idea of a movie hero in a thriller who is able to get ahead by just his brilliance, and not with a gun or by being an action hero.

My guilty pleasure is 'Revenge.' I've watched it from the very first episode.

I thought that all of the sacrifices and blessings of the whole history of mankind have devolved upon me. Thank you, God.

My family traveled a lot. For a while we even lived in a trailer and traveled from campground to campground. If we got to eat at the Cheesecake Factory, it was the highlight of our whole year! But I don't miss having to share a bathroom with seven people or having powdered milk with my cereal. It was so nasty.

Coffee is a way of stealing time which should by rights belong to your older self.

There are a lot of stars I've worked with - big stars - who, when they walk on set, the energy just changes.

I've been involved in one or two successes in classical plays but nothing to touch the excitement and the glamour and the gratification of being a children's hero for so long.

I was determined to have a spotless house when I grew up.

I was slapped down to the ground when my son Wade died in 1996, in April of 1996.

If you represent a fantasy for the people who actually go to the cinema, they grab that and go with it; therefore, for the rest of their lives, they actually identify you with a certain thinking - a certain philosophy. There are many actors who want to pursue that same thought in real life as well, and that's perfectly acceptable.

I love the conversation between film and music.

I think it takes a lot of trickery to keep up with the media and its perception of you. I don't know if I have it in me most of the time to care. The music is made first, and the interviews or photos to keep it alive come later as a necessary evil, I suppose.

Freedom in capitalist society always remains about the same as it was in ancient Greek republics: Freedom for slave owners.

Acting and singing are integrally locked together.

In my job, people tell you that all the time: 'This shoot was great. You look amazing.' But you never know what they say when you turn away.

Mistakes I've made in the past make me afraid to try new things in the future. I want to be perfect.

I am not a dumb animal to be browbeaten, cowed, lashed, coerced or goaded into anything I do not think is right.

There's no doubt I'm emotional.

Never give up and don't ask why because every situation does not need an answer. I'm a firm believer that I don't worry about anything I can't control.

God has given me a life far beyond anything I ever dreamed about. God is, man, God is something else man.

Each decision we make, each action we take, is born out of an intention.