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.

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

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.

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 am stunned by how much time and effort I must spend marketing my book and interacting with my readers. With social media, you don't just publish a book and figure you've done your part; your fans want to talk to you, have a conversation.

The immortality of the soul is assented to rather than believed; believed rather than lived.

Ross Perot came and visited Apple several times and visited the Macintosh factory. Ross was a systems thinker.

This is a whole new world to explore as a developer to go in and learn these new gameplay mechanics, to learn what it's like to actually control a character from a top-down, 'God's eye' view, and to figure out how the game camera can be controlled by the player's head.

Listening moves us closer, it helps us become more whole, more healthy, more holy. Not listening creates fragmentation, and fragmentation is the root of all suffering.

To be an artist you have to give up everything, including the desire to be a good artist.

When in doubt, look at what everyone else is doing.

Keep a relentless eye on your goals! Perseverance, joyful dedication, and unwavering focus will get you there!

If you don't love yourself, you cannot love others. You will not be able to love others. If you have no compassion for yourself then you are not able of developing compassion for others.

In order to predict effectively, we need to use science. And the reason that we need to use science is because then we can reproduce what we're doing; it's not just wisdom or guesswork. And if we can predict, then we can engineer the future.

I don't think that a woman in politics exists or thrives on her own.

You ask any person in the U.S. and they know who Mary Lou Retton is.

I grew up in Birmingham, where they made useful things and made them well.

The family spirit has rendered man carnivorous.

I don't play villainy. I wouldn't even know how to play it.

We learned about gratitude and humility - that so many people had a hand in our success, from the teachers who inspired us to the janitors who kept our school clean... and we were taught to value everyone's contribution and treat everyone with respect.

Language and written language are the only real way we have to see inside another person's thoughts and to know what makes another person human. Without writing, we just wouldn't have that kind of access.

I enjoy dating. I love first dates. I think they're incredibly fascinating studies in human psychology. When you sit down across from someone on a first date and things are going alright, you talk objectives. We want to win each other over, so how do you win someone over? You have to put the best foot forward.

I am a feminist, and I define myself: Be yourself, because if you can get away with it, that is the ultimate feminist act.

Hinduism insists on the brotherhood of not only all mankind but of all that lives.

I feel certain that if, in our homes, parents will read from the Book of Mormon prayerfully and regularly, both by themselves and with their children, the spirit of that great book will come to permeate our homes and all who dwell therein.

In general, good tools for staying in sync just haven't been built and made available to the world.

You turn on the TV, and you see very bland interviews. Journalists in the United States are very cozy with power, very close to those in power.

Seeing comes from the inside, from the heart, from life's experiences.