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

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 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

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.

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.

Saving the world via medical research or going off to Gobi Desert to dust off dinosaur eggs is what I thought I might be doing when I was a kid, and I'd love to bring those interests to a show like 'E.R.' or 'The West Wing,' or a movie like 'Jurassic Park.'

Dare to stretch hard and make it a point to do the hard thing others are afraid to try.

I'll never change the name of the Redskins. You have my word on that.

I could eat healthier; I could drink less.

Economics was the only profession where a person could be considered an expert without having once been right.

The conservation of nature the proper care for the human environment and a general concern for the long term future of the whole of our planet are absolutely vital if future generations are to have a chance to enjoy their existence on this earth

The last thing I want my robot to be is sarcastic. I want them to be pragmatic and reliable - just like my dishwasher.

If I've been dating someone for, say, five months, and she cheats on me, I don't think it would be worth it. I'm not committed enough to the situation to give her a second chance.

We have this idea of perfection that is so unrealistic. We are our own worst enemy. No one is noticing that little scar.

I don't hate old men but listen when being spoken to.

Concrete poets continue to turn out beautiful things but to me theyre more visual than oral and they almost really belong on the wall rather than in a book. I havent the least idea of where poetry is going.

Detroit is really the most perfectly laid out city one could imagine and such an enchanting park and lake infinitely better than any town I know in Europe. It ought to be a paradise in about fifty years when it has all matured.

I want to be around for a long time, singing and making albums and movies.

I never read. I've never read one book... I just can't do it. Something's wrong with me. I have what they call now is 'ADD,' like I'll read and all of a sudden I'll be thinking about shopping or... I'm not there. I drift off. I get crazy, so I don't even bother.

I booked my first studio at like 12 or 13. Somewhere in that season of my life, singing along with the radio became me wanting to be on radio, you know. And writing Langston Hughes replica poems became me wanting to write like Stevie Wonder.

I don't care if you're a Republican or a Democrat, there is something profoundly un-American about using the brute force of government to bully someone.

Dharma is the study of what is and the only way you can find out what is true is through studying yourself.

Paul McCartney would be the end all, be all. To work with Paul would just be amazing.

When I was 13, I started writing songs, and it fell into my lap all of a sudden. I wrote poems and journals, but that's when it switched for me to songwriting. That's when I wanted to do everything. It was like a fire all of a sudden. I started coming to Nashville and moved here when I was 15.

I go to work the minute I open my eyes.

Creativity is not a trait that we inherit in our genes or a blessing bestowed by the angels. It's a skill.

I'm not a big fan of the post-Armageddon stories, where Denzel Washington is walking around in a torn coat.

A storm swept the world in 1968. It started in Vietnam, then blew across Asia, crossing the sea and the mountains to Europe and beyond. A brutal war waged by the U.S. against a poor southeast Asian country was seen every night on television.

A simple way to address hidden curriculum issues is to spend time talking with staff and key leaders about their spiritual lives.