Biology - September 2007

Is there evidence for this or is it theoretical? Can epigenetics lead to speciation in the absence of mutation? Thanks.

BTW: I am NOT a creationist and I do know what a mutation is and what epigenetics marks are.

2007-09-13 09:13:01 · 3 answers · asked by Anonymous

a)from 2 glucose moelcules
b)from 2 monosaccharides by dehydration systhesis
c)when ionic bonds like two monosaccarides
d)when water molecules are added to 2 monosaccrides
e)when glucose and lactose are combined

2007-09-13 09:08:25 · 2 answers · asked by damigurl05 1

I'm fed up with creationists saying mutations are always deleterious. Surely there must be at least on recorded example of a benign mutation (in the lab or something).

2007-09-13 07:38:24 · 12 answers · asked by Anonymous

What are your favourite theories? What is the dominant one in science at the moment?

Urey Mills (was it?).
Iron Sulphur World.
RNA world.
Organic coumpounds from space.
Cells from space (or cell wall materials on asteroids which formed cells when they hit the earth's water)

Those I know of. Are they the mainsream ones, and are there many others? What sites should I visit. I know of a few astrobiology sites, but that's it.

2007-09-13 06:32:46 · 3 answers · asked by Anonymous

What if it needs to be removed, can it be replaced? How important is it? (aside from pregnantcy/ women)?

2007-09-13 06:28:47 · 5 answers · asked by shanekeavy 5

I believe from what I've read that when a parent has a child the parent's genes increase in frequency in the human gene pool.

Let's imagine that the father had the sole copy of an ancient gene. By passing it on to his son the frequency would be doubled from 1 to 2 - right?

If so, here is my question: WHEN does the gene copy enter to pool - at conception, during fetal development, at the birth of the child, or later still, maybe at sexual maturity?

2007-09-13 06:16:01 · 6 answers · asked by Anonymous

2007-09-13 05:59:44 · 1 answers · asked by Anonymous

2007-09-13 05:28:35 · 2 answers · asked by cathe 1

zoological name and its activities plzz

2007-09-13 05:24:56 · 1 answers · asked by WEIRDnik 3

A small number of bees die in the hive and some by preditors.
Why do the majority die away from the hive, remembering that the queen lays up to 1K eggs per day, these bees emerge, and bees only live 6 weeks during the summer. So we never find hundreds of bees dead in a hive, due to normal lifespan.
This question has nothing to do with disseases or preditors.

2007-09-13 05:18:47 · 12 answers · asked by beeman 1

2007-09-13 05:03:04 · 3 answers · asked by damigurl05 1

water molecules are polar with ends that exhibit positive and negative charges.Such opposite charges make water molecules attract each other through what kind of bonds?

2007-09-13 04:37:57 · 3 answers · asked by damigurl05 1

its for a science project so it has to be cheap

2007-09-13 03:58:17 · 2 answers · asked by Anonymous

2007-09-13 03:28:22 · 2 answers · asked by Shonen81 1

2007-09-12 19:04:27 · 3 answers · asked by beeehhh 1

Yes I know. An egg. But WHERE in the world did chickens originate from? And if possible, list a source. Thanks!

2007-09-12 17:05:37 · 4 answers · asked by Bon Jovi Rocks Hard 4

2007-09-12 16:56:30 · 1 answers · asked by Anonymous

2007-09-12 15:41:32 · 5 answers · asked by Stuff 3

I'm in 11th grade now and I'm considering a career in biology.

Do you know any biology related career which will make quite a lot of money? (My parents want me to get a nice job with enough salary)

And what country is the best place to study that subject? Please give me the school names too.

Thanks! Any advice will be greatly appreciated...

2007-09-12 15:13:50 · 2 answers · asked by Anonymous

Should we pass our organs to someone else when we are done with them?

What say you?

2007-09-12 14:52:18 · 3 answers · asked by ccruns 2

what problems might result if a country uses both systems of measurement?

2007-09-12 14:48:29 · 10 answers · asked by Anonymous

2007-09-12 14:35:24 · 8 answers · asked by Anonymous

Biology includes what other subgroups?
thnx

2007-09-12 14:08:06 · 7 answers · asked by yaknow.. 3

2007-09-12 14:03:01 · 4 answers · asked by Anonymous

:)

2007-09-12 13:58:40 · 1 answers · asked by Anonymous

2007-09-12 09:39:05 · 2 answers · asked by aby 1

2007-09-12 08:07:27 · 3 answers · asked by Anonymous

the beaks of a bird and the beak of a giant squid evolved independently and serve the same function. the beaks are _______ structures.
a.convergent
b.phentic
*c.analogous
d.hybrid

the haploid form in a platns life cycle is called the
a.sporophyte
*b.gametophyte
c.parental generation
d.alternative generation

antibiotics are ineffective against viral infection because
a.viruses are protected inside their host cells
b.viruses have enzymes that inactivate the antibiotics
*c.antibiotics interfere with metabolic processes that viruses do not perform
d.viral protein coats block the antibiotics from entering the virus

bacteria reproduce by
a.mitosis
b.meiosis
*c.splitting into identical cells
d.cytokinesis

which of the following is usually characteristic of reproduction in a terrestrial enviroment?
a.extermal fertilization
b.internal fertilization
c.shell-less, water-permeable eggs
d.none of the above

thanks, for the help!

2007-09-12 07:28:01 · 4 answers · asked by Anonymous

2007-09-12 07:22:44 · 4 answers · asked by bubububububub 1

Molecules in the retina respond to particular wavelengths of electromagnetic radiation - what we think of as visible light - and this is how we can see. Insects can see further into the EM spectrum than we can. Is it conceivable that an organ could evolve which has molecules, crystals or whatever that can transmit and receive radio wavelengths?

2007-09-11 23:43:04 · 6 answers · asked by Anonymous