Science & Mathematics - 10 January 2007

In my exam today, there was a question that asked you to list five organelles in the order that they would be separated during differential centrifugation. I knew the others, but was confused between the nucleus and cell wall. Anyone know which is separated first?

2007-01-10 02:56:39 · 3 answers · asked by lykastar 3 in Biology

2007-01-10 02:55:34 · 8 answers · asked by guitar girl 2 in Mathematics

Pb(ClO[sbscrpt4])[sbscrpt2] + NaI ---> PbI[sbscrpt2] + NaClO[sbscrpt4]

Step by step would be greatly appreciated since then perhaps I'll understand the concept and be able to do the rest on my own. Thank you !

2007-01-10 02:55:20 · 3 answers · asked by Anonymous in Chemistry

Do the National Security Agency, Federal Bourne Investigation or the Centeral Inteligence Agency keeps thier data in crystal? Is it true that the arrangement of atoms in the crystals enable it to store more important data compared to a computer?

The data are stored using holograms within the molecules of stable crystal. The data is read and write using laser. The symmetrically arranged atoms could store enormous data in it.

Are thoese facts true? Please tell me more about it. thanks.

2007-01-10 02:54:35 · 3 answers · asked by koko 3 in Engineering

2007-01-10 02:53:51 · 5 answers · asked by don b 1 in Medicine

I'm trying to put my brain around magnetic forces. I get the whole magnetism things, opposites attract, like charges repel, etc....

I'm trying to put this in terms of a physical sense that I can relate to. For example: There is a large crate on the floor in front of me. I want to push this crate. I place my hands on the crate, my feet push against the floor, the force travels up my body to my hands and pushes on the crate, making it move!

Okay, with magetism, I need to understand what PHYSCIALLY pushes or pulls on magnets. Are there electrons flying back and forth pushing or pulling between magnets? What EXACTLY makes up the magnetic force?

In the electromagnetic spectrum, you have electrons and photons (I'm a little rusty but I think that's right), what is the magnetic force made of?

2007-01-10 02:48:22 · 8 answers · asked by CJP 3 in Physics

the number.

2007-01-10 02:47:23 · 34 answers · asked by Anonymous in Mathematics

2007-01-10 02:46:21 · 5 answers · asked by Anonymous in Zoology

2007-01-10 02:46:20 · 4 answers · asked by ajay_yelamanchi 1 in Chemistry

2007-01-10 02:45:03 · 21 answers · asked by suhas k 1 in Astronomy & Space

2007-01-10 02:43:59 · 12 answers · asked by munirlutfi 1 in Biology

Find the zeros of
f(x) = 7 - 15x + 9x^2 - x^3



I couldn't figure it out :(

2007-01-10 02:40:38 · 6 answers · asked by Anonymous in Mathematics

2007-01-10 02:38:44 · 3 answers · asked by Eyswaria R 1 in Other - Science

2007-01-10 02:38:40 · 3 answers · asked by sishkage 1 in Biology

What is the length of side x

Here it is: http://i131.photobucket.com/albums/p285/pickapet1/1f9388d5-7660-4952-a795-d96533f4926.gif

Please explain how you got your answer.

2007-01-10 02:38:30 · 4 answers · asked by Rattiesrule 2 in Mathematics

Does anyone who is working with these cells have any references for them??
In my experiments I have two batches one is actively growing and one is in the G0 phase of the cell cycle, I damage both with peroxide and leave to grow, to see if the phase of growth corresponds to the damage caused??
any help would be much appreciated.

2007-01-10 02:38:29 · 2 answers · asked by SANDIE 2 in Biology

2007-01-10 02:35:23 · 4 answers · asked by MOISES C 1 in Physics

Im conducting a regression analysis, and apparantly statistical parlance is something significantly important to regression, can anyone help me out?

2007-01-10 02:33:23 · 5 answers · asked by Noor Fatemah 1 in Mathematics

2007-01-10 02:32:30 · 3 answers · asked by Anonymous in Mathematics

How might this record be different if humans had air sacs like birds do? Discuss the changes that would occur in human lungs and the respiration process in your explanation.

2007-01-10 02:27:50 · 4 answers · asked by Anonymous in Biology

2007-01-10 02:27:11 · 2 answers · asked by elizangela r 2 in Chemistry

Take a piece of A4 (210mm x 297mm) paper and fold the sides up to form a tray so that the volume inside the tray is maximised.
What is the height of the tray when maximum volume is reached. Let the height = x
a quadratic equation, apparently

2007-01-10 02:23:38 · 5 answers · asked by desperado 1 in Mathematics

2007-01-10 02:23:17 · 2 answers · asked by siko 1 in Physics

2007-01-10 02:22:40 · 8 answers · asked by Anonymous in Astronomy & Space

2007-01-10 02:21:02 · 15 answers · asked by Anonymous in Astronomy & Space

I read an article about how a harmless strain of the bactierium Vibrio cholerae was forceably changed by a bacteriophage to a become highly virulent one that causes cholera.

Is this an example of forced evolution?

2007-01-10 02:19:20 · 3 answers · asked by Anonymous in Biology

Can anyone answer it? I have it as a question for math.

2007-01-10 02:17:36 · 2 answers · asked by joanaa 1 in Mathematics

Please help!
I'm doing an investigation into the behaviour of capacitors in audio electronics and have made some simple filter networks. I understand how the filters work and their frequency response and everything, but why do you get a slightly curvy square wave shape as the output signal? Why wouldn't it just be a normal square wave or even a sine wave? Please help if you can! Thanks!

2007-01-10 02:16:26 · 3 answers · asked by wonder.crumpet 2 in Other - Science

2007-01-10 02:14:28 · 1 answers · asked by x_code80 1 in Biology

I am interested in robots ...
Which would be ideal choice ?
I'm interested in BTECH IT or BE Comp. Sci

2007-01-10 02:14:25 · 9 answers · asked by man4ss 2 in Engineering