Biology - September 2006

1) chemical nutrients cycle within an ecosystem's structural web
b) the web of relationships within an ecosystem includes the nonliving components of the environment
c) in the process of energy conversions, energy is eventually converted to heat
d)bacteria and fungi recycle energy within an ecosystem
e)plant and other photosynthetic organisms are producers

2006-09-09 14:06:35 · 9 answers · asked by blahhhaha 3

How many of the 20 or so amino acids in the body require that they can produce themselves. Where does the body obtain the rest of the amino acids?

I need to see your source, too.

2006-09-09 12:59:08 · 4 answers · asked by RED MIST! 5

dont even start to think abt genetic engineering it wasnt there then

2006-09-09 12:33:16 · 38 answers · asked by antoinette cee 1

2006-09-09 12:28:02 · 5 answers · asked by ajaffe9 2

2006-09-09 12:15:58 · 3 answers · asked by Andy H 1

And is the male's Y gene dissolving? I know the answer--just want to see if you know the answer--I was surprised by the what I discovered!

2006-09-09 12:06:16 · 5 answers · asked by tampagirl1015 2

i write with my RIGHT hand and draw with it as well.. something with me left depending on what kind of look im after.. how can i learn write with my Left hand and why do most people only use one hand?

2006-09-09 11:39:48 · 9 answers · asked by Taylor 3

How does illegal drug use effect brain cells in a way that legal drugs do not?
Is there any proof of the "kills braincells" mantra?

2006-09-09 11:14:23 · 15 answers · asked by Anonymous

2006-09-09 11:05:29 · 5 answers · asked by hottie 1

For each of your suggestions, suggest the function of water.

2006-09-09 10:46:06 · 32 answers · asked by Anonymous

2006-09-09 10:42:05 · 24 answers · asked by ladybuglucyo 1

2006-09-09 10:35:11 · 8 answers · asked by ladybuglucyo 1

2006-09-09 10:33:36 · 13 answers · asked by ladybuglucyo 1

2006-09-09 10:09:39 · 19 answers · asked by Anonymous

2006-09-09 10:00:23 · 10 answers · asked by Nurse2b 1

2006-09-09 09:42:54 · 7 answers · asked by gracel313 6

2006-09-09 09:14:36 · 10 answers · asked by many_many_squirrels 1

When we think...is it linear? Is thinking always done in language, or are thinking and reacting the same. Ex. Pulling hand away from a flame? AND if you are reacting to something like that...is it possible to still be thinking about something else at the exact same time?

2006-09-09 09:13:35 · 18 answers · asked by Anonymous

do you think it could be possible for neurons to multiply or reproduce asexually. how long do they last.

2006-09-09 09:09:14 · 5 answers · asked by almostageniusbutsomuchtoknow 2

2006-09-09 09:08:03 · 7 answers · asked by Erin D 2

First of all, I am not asking this from the point of view of a creationist, so please answer seriously and without just taking jabs at people of faith. The question is, there are vast gaps in the fossil record. If evolution were actually taking place, wouldn't the fossil record show an EXTREMELY smooth transition of the evolution of life forms? I mean really, really, extremely smooth. Changes according to evolution are so minor over many, many, many generations it seems there would be a much better record, and there would certainly be no talk of a "missing link" between man and his predecessors.

By the way, I was watching the Discovery Channel the other day about a new find of a pre-homosapien cranium, which was interesting; but what I found really interesting was an offhand comment one of the scientists made which was "You can put all of the fossils we have found to date of man and his ancestors in the back of a regular pickup truck. That ain't very many fossils.

2006-09-09 09:02:00 · 10 answers · asked by Random Precision 4

2006-09-09 08:45:29 · 5 answers · asked by Nurse2b 1

2006-09-09 08:44:22 · 13 answers · asked by Nurse2b 1

How can we define life and death? what makes someting 'live' and what makes it 'die' ?

2006-09-09 07:49:38 · 21 answers · asked by A-jay 1

2006-09-09 07:33:18 · 5 answers · asked by Nurse2b 1

I lived in China for 11 years and rarely saw teens whose face grew pimples, why is that? I mean shouldn't it be the opposite due to pollution? Many people say that pimples have nothing to do with diet....

2006-09-09 07:28:20 · 14 answers · asked by Anonymous

2006-09-09 07:27:03 · 11 answers · asked by Andy S 6

2006-09-09 07:09:10 · 2 answers · asked by neari v 1

2006-09-09 06:47:17 · 8 answers · asked by ? 6

"Crossing over occurs at the 4-strand stage. A single crossover between two genes at meiosis results in 2 parental-type chromatids and two recombinant chromatids. Double crossovers result in the following proportions of recombinant chromatids: Two-stand double crossover gives 0% recombination. Four strand double crossover gives 100% recombination. (This is equally common as the two strand DCOs). Three stand double crossover gives 50% recombination, and is twice as common as either the 2 stand or 4 strand event. Overall the result is that for genes far from each other, there will be independent assortment (50% recombinant progeny)." http://www.wsu.edu/~thorglab/biol301/lectures/lecture0130.html
I only need help with this: does it mean that two non-sister chromatids will cross over usually, but sometimes they'll cross over again, undoing the first crossover? and sometimes a third chromatid will cross over with one of those two; and that sometimes all four chromatids cross over? Right?

2006-09-09 05:47:55 · 4 answers · asked by recordsetter01 2