Biology - September 2007

2007-09-11 21:45:59 · 5 answers · asked by jubka1 2

This is just one of those questions I got to thinking idily about on my way to work this morning.
At the time, I was drinking my Starbucks and I thought to myself,
"This isn't sweet, but then I'm enjoying it. Why do I like something that's slightly bitter to taste? I like beer too, but that wouldn't be classed as something drinkable in normal circumstances."
Don't we have those 'bitter' and sour receptors on our tongue from the primitive years when we needed to identify what foods were poisonous or toxic?

2007-09-11 21:12:15 · 2 answers · asked by Anonymous

can they only differentiate into blood cells only? Haematopoiesis stem cells?
or can they differentiate into other things? ie. lung cells, nerve cells etc.

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one other question: do red blood cells retaian their DNA in their Nuclei?
what about Platelets which dont retain their nuclei?
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thanks for all the help iv been getting on my other Q's about stem cells! 8-)

2007-09-11 20:48:51 · 6 answers · asked by Anonymous

i know to many addictys in their forties that look at least 5 years younger than they really are... heroin is said to slow the bodies functions and could therefore slow the metabolism. Which could retard the againg process. Look at methamphetamines, they speed up the bodies functions and look how nasty those people get in a few years. sure heroin can give you that droopy face, dark circles under eyes but, but its seems to me that it prevents wrinkles. thats just what i think... and of course heroin is a dangerous drug that should not be messed with.

2007-09-11 19:40:43 · 12 answers · asked by Anonymous

2007-09-11 17:45:04 · 8 answers · asked by shriya 2

2007-09-11 17:14:35 · 6 answers · asked by jubka1 2

Why?? Is the amount of cells vital in this aspect? Can cells be limitlessly tinier

2007-09-11 16:28:31 · 6 answers · asked by fragment 1

I need mosquitoes for my science project. do i have to breed them? how? (but i am afraid that the mosquitoes might carry a disease)
or

can i just replace them with another insect since im just testing the killing power of an insecticide? what insect then?

thanks :D

2007-09-11 16:19:28 · 3 answers · asked by backfire11811 2

ITS SOME TYPE OF ANIMAL I THINK

2007-09-11 15:41:16 · 17 answers · asked by colin h 2

Answer Yes or No to each of the following questions:

Does every major religion today teach a story of origins?

Does evolution teach a story of origins?

Does every major religion today teach a future based on its beliefs?

Does evolution teach a future based on its beliefs?

Does every major religion today teach about God's power in the past?

Does evolution teach about God's power in the past?

Does every major religion today teach on human ethics
regarding the environment?

Does evolution teach on human ethics regarding the environment?

Do some religious people get angry when their beliefs are challenged?

Do some evolutionists get angry when their beliefs are challenged?

When a country internalizes religious beliefs can this lead to wars
and the killing of millions?

Theres your answer.....it is.

2007-09-11 15:30:52 · 12 answers · asked by krautpierogi 1

2007-09-11 13:48:01 · 3 answers · asked by EGGO 2

I still am not entirely sure of what a complex organization is, but I think knowing a few examples of some would help my understanding.

2007-09-11 13:28:33 · 1 answers · asked by Michael F 1

Is an AMINO GROUP of an organic compound polar & water soluble? What about for a sulfhydryl group of an organic compound?

2007-09-11 13:02:46 · 1 answers · asked by iamsuperpeace 2

antibiotics
a.include penicillin, tetracycline and streptomycin
b.may prevent bacteria from making new cell walls
c.are very effective treatments for bacterial deseases
d.all of the above

a vaccine
a.neutralizes toxins produced by bacteria
b.prevents the process of protwin synthesis in viruses
c.stimulates an immune system responce to the pathogen
d.causes the production of antibiotics

bacteria lack a true nucleus and membrane-bound organelles; therefore they are classified as
a.prokaryotes
b.movement by amoebas
c.euglena reproduction
d.paramecium mitosis

pseudopods are used for
a.paramecium conjuction
b.movement by amoebas
c.euglena reproduction
d.paramecium mitosis

fungi
a.do not contain chloroplasts
b.have cells walls that contain chitin
c.do not produce their own food
d.all of the above

guard cells:stomata:
a.can openers:cans
b.hammers:nails
c.cushions:rocking chairs
d.all of the above

2007-09-11 10:51:11 · 3 answers · asked by Anonymous

To the nearest power of ten, how many protein molecules with a molecular weight of 25,000 are found in a crystal that is 3 mm on each side? Assume that a crystal is 50% water and that the density of a protein is the same as that of water.

2007-09-11 10:43:18 · 1 answers · asked by Anonymous

2007-09-11 08:07:27 · 13 answers · asked by NICK H 1

Hello,

I have heard that cranial features become exagerrated as we age. After puberty, some say that skulls elongate, foreheads broaden, but I was just wondering if there was a professional opinion on this that could help out.

Specically, what kind of changes occur as the result of aging and maturation, and when do these changes begin to occur? (ie: do skulls begin to lengthen, enlarge in the 20s, 30s...?)

I am in my early 20s and would be very interested to know how, or even if, my skull will change in the coming years.

Thank you!

2007-09-11 07:49:43 · 3 answers · asked by LKaM 2

I am having a lil trouble starting this. I know that the relation between the four has to do with Energy but I need help comparing them in the correct manner.

The original question is.
Compare and contrast the metabolic terms anabolic and catabolic to the energy terms exergonic and endergonic

2007-09-11 07:18:15 · 2 answers · asked by Anonymous

2007-09-11 06:55:13 · 2 answers · asked by Anonymous

please help me!!

2007-09-11 04:58:33 · 5 answers · asked by ? 1

The human eye is amazing, it can let you see in colour and in amazing detail that we have yet to match with our cameras.
How did it come about though, it would have taken ages through evolution? Also, why would we have needed an eye to start with, couldn't our other senses just get stronger.

This is my thought, what is yours?

Our eyes were developing and were very weak. Therefore, we used a form of supersonic location and then as our eye got stronger our hearing weaken. As a bat doesn't need good eyes it hasn't developed?

2007-09-11 03:58:11 · 7 answers · asked by ??? 2

i need their evolution history starting from the earliest form of seahorses

2007-09-11 03:22:29 · 2 answers · asked by cutie 1

I was convinced that DNA could only be checked from samples of (significant) body tissues (or fluids), such as saliva, sweat, blood, sperm...

(And even these samples could only provide results if analyzed within a certain ammount of time...)

I can't believe that people are able to make serious accusations based on some 'alleged biological remains', which seem comparable to 'dust' or so...

2007-09-11 02:02:15 · 5 answers · asked by Anonymous

How does extinction affect us humans?

2007-09-10 23:59:44 · 7 answers · asked by Anonymous

2007-09-10 22:45:03 · 1 answers · asked by Rebecca A 1

i've searched for answers..
and mostly said.. about 'cells getting deteriorate'.
then why cells deteriorate ?
is there any connection with gravity ?
if there's no gravity, cells won't deteriorate ?
or any other factors ?
thanks

2007-09-10 22:36:33 · 4 answers · asked by Anonymous

2007-09-10 22:15:01 · 2 answers · asked by bipin s 1

how do mitosis and cytokinesis differ between plant and animal cells?

2007-09-10 20:58:53 · 3 answers · asked by Anonymous

How is the absence of a nucleus and other organelles from (mature mammalian) erythrocytes related to their function in oxygen transport, as well as to their relatively short life span?

2007-09-10 19:43:29 · 3 answers · asked by Rakelina 2

If they can make a stem cell into a glia cell, they could use them in people who need glia cells. They might be able to do this in the future, but they can't turn stem cells into glia cells yet.

Are my above two statements correct?
I know this isn't perfect, but I don't understand stem cell research very well, and I need the information for a university science project on schizophrenia. I came across an article that said the brains of schizophrenics have fewer glia cells.

2007-09-10 18:34:52 · 6 answers · asked by rebekkah hot as the sun 7