Science & Mathematics - 29 January 2007

or, when was this first observed with a microscope?

2007-01-29 15:38:02 · 1 answers · asked by rubbawubba 1 in Biology

One atom of 18O has a mass that is 1.50 times higher that of a 12C atom. What is the atomic mass of this isotope of oxygen expressed in atomic units?

2007-01-29 15:36:01 · 2 answers · asked by dimo_e7 2 in Chemistry

2007-01-29 15:35:23 · 4 answers · asked by s1us1ang 1 in Engineering

The endosymbiosis theory suggests that mitochondria in eukaryotes originated when an archaeal cell engulfed a proteobacterium and retained the bacterium as an organelle. What evidence supports this theory for the origin of the mitochondrion?

It's multiple choice and the choices are:

a) The mitochondrion has a circular chromosome

b) The DNA in the mitochondrion is very similar to proteobacterial DNA suggesting recent common ancestry

c) The mitochondrion is replicated within the plant cell by binary fission.

d) All of the above

2007-01-29 15:34:34 · 7 answers · asked by Student_007 1 in Biology

soln saturated w/ PbS04 @ 50C (ksp 2.3x10^-8) what mass will precipitate from 815ml when cooled to 25c? The ksp for 25 deg. C is ( 1.6 x 10^-8) I'm a bit confused as where to start, can anyone give me an idea?

2007-01-29 15:34:31 · 1 answers · asked by biologynut1 1 in Chemistry

2007-01-29 15:34:27 · 1 answers · asked by lala haha gaga mama 2 in Engineering

Find the inverse of the following function where the domain of the function is x > 0. Leave your answer in terms of y.

Y= x² –1 / x

2007-01-29 15:34:09 · 3 answers · asked by Anonymous in Mathematics

2007-01-29 15:33:22 · 3 answers · asked by Anonymous in Astronomy & Space

The position of a particle as a function of time is given by:
r (vector)=(5i +4j)t^2 m, where t is in seconds

What is the particle's distance from the origin at t = 0, 2, and 5 s?

2007-01-29 15:30:56 · 2 answers · asked by Anonymous in Physics

2007-01-29 15:29:23 · 5 answers · asked by kiwijuicepanda 1 in Biology

how would I do it mathmatically...Im stumped, and I guess kind of stupid when it comes to mathmatics.

2007-01-29 15:26:53 · 4 answers · asked by xtaticlyme 2 in Mathematics

2007-01-29 15:26:29 · 3 answers · asked by sweetandlow16530 1 in Biology

Can someone out there help me with this? I know the answer is simple, I just can't seem to figure it out!

1/6 - 1/3t > 0. Solve for t

Thanks!

2007-01-29 15:22:55 · 7 answers · asked by nghek 3 in Mathematics

2007-01-29 15:22:11 · 5 answers · asked by Kuira 1 in Weather

2007-01-29 15:21:36 · 9 answers · asked by chelseafry19 1 in Mathematics

I want some tricky answers

2007-01-29 15:16:39 · 14 answers · asked by Anonymous in Mathematics

y varies jointly with the cube of x and the square of z and inversely with the square of the sum of x and z if y = 72 when x= 2 and z=3 , then find the value of y when x= -1 and z=5.....thx...... I am very lost plz explain all work and answers in detail thx

2007-01-29 15:14:43 · 2 answers · asked by Anthony V 1 in Mathematics

Would like to find out the process for milking cows with todays machinery. Such as: how do you clean the teats, how often do you have to milk them, what happens if you don't milk them, who picks up the milk (tank truck?), etc.

2007-01-29 15:10:29 · 1 answers · asked by Anonymous in Zoology

2007-01-29 15:10:24 · 9 answers · asked by trudemetress26 1 in Mathematics

2007-01-29 15:09:35 · 6 answers · asked by khan m 1 in Engineering

I'm interested in anything electrical or having to do with muscle. Any suggestions?

2007-01-29 15:07:59 · 5 answers · asked by sharke45 2 in Engineering

2007-01-29 15:06:35 · 3 answers · asked by Anonymous in Mathematics

2007-01-29 15:05:29 · 14 answers · asked by trudemetress26 1 in Mathematics

specifically in the red river area

2007-01-29 15:05:04 · 1 answers · asked by Anonymous in Zoology

2007-01-29 15:03:36 · 4 answers · asked by MOHAMMED K 1 in Engineering

exponent/ the base of a natural log, the ln thing

2007-01-29 15:01:25 · 5 answers · asked by koushik c 1 in Mathematics

2007-01-29 14:58:55 · 20 answers · asked by Anonymous in Zoology

2007-01-29 14:58:51 · 11 answers · asked by trudemetress26 1 in Mathematics

what do you think about the whole Roswell thing?

2007-01-29 14:58:39 · 17 answers · asked by Anonymous in Astronomy & Space

I think to use Alum but what type of Alum. Anyone with a good recipe. Please help

2007-01-29 14:58:02 · 1 answers · asked by ana v 1 in Chemistry