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

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.

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.

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 think that, as African-Americans, oftentimes we have to put ourselves on pedestals as opposed to really looking at ourselves and trying to understand ourselves and become better people. We always have to be on pedestals.

The devil takes a hand in what is done in haste.

Most disagreements are caused by different perceptions that created different realities.

Independence is a heady draught, and if you drink it in your youth, it can have the same effect on the brain as young wine does. It does not matter that its taste is not always appealing. It is addictive and with each drink you want more.

I think the rich should pay more in taxes - I agree with that 100 percent - but everybody should feel the pain a little bit.

Race is still the No. 1 determinant in every election.

The major work of the world is not done by geniuses. It is done by ordinary people, with balance in their lives, who have learned to work in an extraordinary manner.

I know that BMW is now a sponsor of the USOC - of the United States Olympic Committee - so they offer the use of their aerodynamic speed-tunnel for testing and such for the athletes, which is a great advantage. But to be honest with you, I'd rather have a free car!

I've learned through experience of playing different characters, some of whom were jerks, that when you play a character who is pretentious or obnoxious, in any way, it's important to knock them down a peg.

I'm not really attracted to a big, jacked guy. I think that's a little excessive.

Every single note on this album is there for a reason.

I got kids that are growing up in a Donald Trump world because we screwed up because we haven't been able to craft a message and push policies that connect with working class people.

We're in a post-conceptual era where it's really the artist's idea and vision that are prized rather than the ability to master the crafts that support the work. Today, our understanding of an artist is closer to a philosopher than to a craftsman.

Sometimes people know I am an actor but are not really sure what I have been in.

Academic politics is the most vicious and bitter form of politics, because the stakes are so low.

This film, Tomb Raider 2, is a big challenge. It's quite exhausting.

Why should we try for space travel? It cannot be a substance of any kind that can be expected to pay. It can only be something intangible, not involving haulage, which is at the same time more valuable. There is something like that: Knowledge.

I love a pair of sexy heels with jeans, a nice jacket, or a little dress.

Football doesn't build character. It eliminates the weak ones.

You will never feel alone, if you run down the stairs of loneliness; as every solitary step becomes your companion.

I'm grateful for every chance I get to do something I love and have a passion for.

People are capable, at any time in their lives, of doing what they dream of.

Video games are engineered now, but the step I am trying to take, no one can engineer.

With the movies, people are not going to wait around. The deadline is a deadline. In publishing it's more a polite suggestion.