Science & Mathematics - 14 October 2007

-What happens to the components of water molecules that are split during light reaction?
-Hows ATP synthesized in photosynthesis? What is this process?
-What are the different roles of photosystem 1&2?
-What happens to lost electrons of photosystem 2&1?
-How does the function of the chloroplast relate to its structure?
-A molecule that absorbs certain wavelengths of light & reflects others is called a _____
-What are the 2 energy containing products of light dependent reactions?
-_____ is the protein that adds a phosphate group to ADP
-The splitting of water releases_____
-The synthesis of ATP is a process called _____
-The energy storage molecule used by most organisms is the_____
-_____ is the protein in the _____ membrane that adds a phosphate group to ADP
-The abundance of oxygen in earths atmosphere is a result of ______
-By allowing protons to cross the thylakoid membrane, ATP synthase functions as a _____& by catalyzing the synthesis of ATP it functions as a _____

2007-10-14 11:41:25 · 5 answers · asked by me 1 in Biology

What is a MAX and how is it used in the field. I dont know what this means but i know it relates to optimum muisture, maximum dry density, wet density, sand cone test, compaction and soil types

2007-10-14 11:40:22 · 1 answers · asked by Anonymous in Earth Sciences & Geology

THE QUESTION:

If the passing of five half-lives leaves 25.0mg of (superscript)90Sr, how much was present in the beginning?


THE EQUATION:
#Left = #Original * (1/2) [exponent]T/h
T= time
H= half life



i don't know how to solve this problem because it doesn't give info for the time OR the half life of Sr...what the heck does 'five half-lives' mean?

please help...thanks

2007-10-14 11:34:49 · 5 answers · asked by Meg 1 in Chemistry

What about at what pH will the buffer be half dissociated?

2007-10-14 11:34:45 · 1 answers · asked by Anonymous in Chemistry

I am conducting an experiment and am unsure of the formula used to calculate power. Also, please cite your source.

2007-10-14 11:33:35 · 6 answers · asked by yzie94 1 in Engineering

2007-10-14 11:32:21 · 2 answers · asked by Anonymous in Chemistry

2007-10-14 11:31:34 · 3 answers · asked by Anonymous in Chemistry

1. solve 4|x + 1| + 3 > 10 - 3|x + 1|

2. determine the polynomial whose roots are: 0, 4 +or- root 2

2007-10-14 11:30:17 · 2 answers · asked by Anonymous in Mathematics

I keep thinking of Terry Shivo. Would they have allowed psychics to read her mind so she could say if she wanted to live? I worked with the handicapped. Many couldn't talk. I couldn't "read their minds", but TRIED to "figure out" what they wanted. It was REALLY HARD TO DO..and gave me many headaches trying to understand them in order to help them. What a blessing it would be for them and their caretakers to have someone to help them speak..at least mentally. And that little girl who is handicapped & might get a hysterectomy...If a psychic could read her mind & know what SHE wants..or doesn't want. Wouldn't that be A GOOD THING?? Do "psychics" ever try to help those people who can't talk.?

2007-10-14 11:30:10 · 15 answers · asked by Deenie 6 in Paranormal Phenomena

I have 3 questions on my homework where I can't find any information in the notes or book. Can anyone help?

1. a star's brightness decreases with the square of the distance from the star. the power/ unit area reaching the Earth from the Sun equals 1370 watts/m2. What is the solar power / unit area reaching Saturn, which is at a distance of 9.5 AU

2. Some stellar remnants (essentially dead stars) can have surface temperatures as high as 30,000 K and yet have a luminocity of only 0.05 x the solar luminocity. What can explain this?
-they are very very small
-they are very very distant from earth
-they radiate in an undectable part of the electromagnetic spectrum

3. Consider a star with a surface temp of 21,500 K. In what part of the electromagnetic spectrum would the dominant spectral wavelength be observed?
-microwave
-infrared
-visible
-ultraviolet

2007-10-14 11:30:07 · 2 answers · asked by Sarah 4 in Astronomy & Space

1. Let f be the function defined as
f(x)= absoulute val of(x-1) +2 for x<1
ax^2+bx for x greater or equal to 1
where a and b are constants.
(a) If a = 2 and b = 3, is f continuous for all x? Justify your answer.

(b) Describe all values of a and b for which f is a continuous function.

(c) For what values of a and b is f both continuous and differentiable.

2007-10-14 11:29:36 · 1 answers · asked by leonardo 1 in Mathematics

I realized now, that I've might've seen paranormal things as a kid. I wasn't scared because I had no idea what it was I saw. Of course when you start growing up and start watching scary movies, you start getting scared. Well I don't remember everything but the one thing that stands out is an incident when I was 3 or 4 years old. I was sleeping with my parents on their bed one night and I woke up. I looked towards the dresser with a mirror in front of me and I noticed a shadow of a hand emerge from the back of the dresser. It waved at me and told me to come. So I got up and went to the dresser and looked but it didn't appear again. Another instance was a couple of years after when I was 6 I think. My cousin and I were playing on top of my aunts bed with the TV on in the background. There wasn't any channel on, just static, but we didn't mind. So we were sort of talking when we both saw a face appear, like a monster's face. It said something and then the TV shut off. We both ran away.

2007-10-14 11:28:17 · 22 answers · asked by Chris720 2 in Paranormal Phenomena

I was wondering if mankind is really ready for a ''Real First Contact'' from beyond the earth and our solar system.I have discovered a way to make warp drive and get first contact,but is mankind really ready and if so who do I get in contact with to tell them my discoveries?

2007-10-14 11:28:09 · 11 answers · asked by Super Team 2 in Astronomy & Space

or do you think they would die with us

2007-10-14 11:27:37 · 9 answers · asked by Anonymous in Zoology

2007-10-14 11:27:30 · 8 answers · asked by samjam555 1 in Mathematics

2007-10-14 11:27:23 · 3 answers · asked by rose mundi 1 in Medicine

i'm doing a project about the archimedes screw and i need help! (obviously) can anybody give me the history of the archimedes screw? did other people propose any alternate solutions? anything u can give me about the archimedes screw (including the history) ANYTHING about it is accepted!!!!!! please and thank you!!!!!! =]

2007-10-14 11:25:32 · 5 answers · asked by Lulu 3 in Engineering

I would like to know if it is relatively safe for me to do so, since it can harm pets, and where could i get melamine.

Please, serious answers only.

2007-10-14 11:24:55 · 2 answers · asked by azn_flute323 1 in Chemistry

a roof rises 7.5ft over a horizontal distance of 12.27ft. what is the slop of the roof to the nearest hundredth

2007-10-14 11:20:24 · 2 answers · asked by turlington999 1 in Geography

2007-10-14 11:19:22 · 2 answers · asked by dukebasketball1992 2 in Mathematics

2007-10-14 11:18:56 · 2 answers · asked by china w 1 in Engineering

How come oxygen bubbles form even before water begins to boil?

Thanks

Happy Halloween!

2007-10-14 11:18:52 · 3 answers · asked by UnknownD 6 in Chemistry

how do i solve this?

2007-10-14 11:18:16 · 9 answers · asked by Anonymous in Mathematics

I get confused on this.

2007-10-14 11:18:14 · 2 answers · asked by Mo Girl 1 in Mathematics

Describe briefly the main benefits and shortcomings of communication satellite systems
including for example, their orbits, propagation delays, the nature of the radiation and the
antennae used, and energy requirements.

2007-10-14 11:15:43 · 1 answers · asked by sa7era 1 in Physics

2007-10-14 11:15:26 · 3 answers · asked by heatherrr323 1 in Astronomy & Space

A box 21.6 kg box initially at rest is pushed 2.36 along a rough horizontal floor, with a constant applied horizontal force of 56.2958 N. The acceleration of gravity is (9.8m/s^2). If the coefficient of friction between the box and the floor is 0.188,

1.find the work done by the friction. answer in J.

2. Find the final speed of the box in units of m/s

2007-10-14 11:15:21 · 1 answers · asked by contraseña 1 in Physics

2007-10-14 11:13:01 · 1 answers · asked by Anonymous in Physics

2007-10-14 11:12:53 · 1 answers · asked by Anonymous in Chemistry

1. A tank contains both Nitrogen and hydrogen gas. If the partial pressure are 190 mmHg and 303 mmHg respectively, what is the mole fraction of nitrogen?

2. if 4.0 grams of hydrogen, 6.02 * 10 ^ 22 atoms of helium and 4.48 L of argon, measures at stp, are placed in a 2.0 Liter flask at 27 degree celcius, what is the final pressure.

2007-10-14 11:11:38 · 1 answers · asked by confused ~ 1 in Chemistry