Matt

When IL-2 is secreted by antigen specific T cells activated due to presentation of antigen by APCs, what happens to naive antigen-nonspecific T cells in the vicinity?

Only answer if you know the answer.

A hydration sphere:

A) allows for the dissolving of polar/ionic solutes in aqueous solvent

B) allows for the dissolving of polar/ionic solutes in non-aqueous solvent

C) involves electrostatic attraction between molecules

D) involves ionic bonds with the sharing of electrons between 2 atoms

E) both A and C

Only answer if you know the answer, and don't paste large amounts of text. Would like an explanation why you chose that letter.

Enzymes:

A are composed mostly of protein domains

B have greater affinity for their substrates

C can initiate biochemical cascade reactions

Pick the one you KNOW is right, DON'T paste me paragraphs of text! I'd like a couple of lines explaining why you chose it.

it says the use by date is 14th jan. I know some cheeses taste better with time...but is matured cheddar cheese ok to eat now? It's a block of cheese in a plastic wrap. Answer asap, I want to eat it

Water doesn't expire. Is it because they're worried something might happen if the water stays in there for too long?

I'm new to Adobe Photoshop and I've always been amazed at the things people can do. Want to add someone to msn or yahoo so they can share their skills. I only know how to get rid of wrinkles and that sort of thing. Don't answer with no or whatever. Not interested, don't waste your time replying lol

I was discussing with my ex about the differences between male and female restrooms and I found out that if he knows a guy is sh*tting in there, he will go back out and wait or come back later. I can understand why he does that. But he says everyone does that, or should. Is that true? This is the first time I've heard of it. If you've gotta go, you've gotta go. What's the point in having so many cubicles if only one person can go in one at a time? Are there some unwritten rules for female restrooms?

People tell me art is about how you interpret it and what you see blah blah blah. I don't get the blank canvas!! Do people or this person actually get paid to come up with that idea? What am I supposed to think when I look at it? Is there this one thing it actually represents? -_-

I'm 20, but I feel like I'm gonna be 50 the next time I blink. Time flies by for me and I'm so scared. I remember when I was 10, and I turned 11, I couldn't stop thinking that I was so old. Something traumatic did happen when I was a kid (think whatever you want) and I wonder if that has contributed somehow. I actually cried on my 20th cos I was no longer a teen. I'm not permanently depressed. I just feel 'ugh' sometimes. 10 years to me might as well be 10 minutes. I feel like time is running out. No abuse please lol.

Mine does, and I'm sure I'm not hungry, but sometimes I think it might be because I don't want to eat at that point in time. Just wanna know if others get it too.

There could be multiple people watching one TV, or only one person, or even none. I have 5 TVs in my house. I could turn them all to one channel. Do they know when we turn on a TV?

How do they calculate the ratings? Yes, I know it's more than one question.

My gran has none, except on her eyes and head. Even when she was a teen, she was hairless. I know this because she told me and when she had to have an operation, and needed to be shaved, and the nurse couldn't see any. I looked closely at her arms. No hair.

Reply with how it is possible.