Biology Test!

Discussion of all aspects of cellular structure, physiology and communication.

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onexsoul
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Biology Test!

Post by onexsoul » Wed Nov 28, 2007 12:35 am

OK I'm in ninth grade and am trying to study for an up comming test. I need to know about Homeostasis, Passive, Active, and Facilitated transport, the differnece between plant and animal cells, prokaryotic and eukaryotic cells, all the classifications of life and example of such, key characterists of viruses and a few other things...

If ANY of you can help me on ANY of these subjects or the best way to study for them all please let me know ASAP .... the test is the day after tomarrow (November 29)

I figured a way to remeber the classifications of life... but the the examples.
PLEASE HELP ME!!!! :!: :!: :!: :!: :!:

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MichaelXY
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Post by MichaelXY » Wed Nov 28, 2007 1:00 am

The best way to learn this stuff is to study.
But I will say this for homeostasis. Consider it like this. The body needs to regulate certain conditions of the body, like temperature, much like you would do when controlling the temperature in your house. You would input a setpoint on your thermostat, which in turn would monitor the house temp. If the house gets to cold, the heater kicks on. Too hot the heater shuts off. This system form a feedback loop. Illness occurs when something goes wrong in the loop.

onexsoul
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Post by onexsoul » Wed Nov 28, 2007 1:13 am

MichaelXY wrote:The best way to learn this stuff is to study.
But I will say this for homeostasis. Consider it like this. The body needs to regulate certain conditions of the body, like temperature, much like you would do when controlling the temperature in your house. You would input a setpoint on your thermostat, which in turn would monitor the house temp. If the house gets to cold, the heater kicks on. Too hot the heater shuts off. This system form a feedback loop. Illness occurs when something goes wrong in the loop.

im pretty sure i know what homeostasis is.. isnt it the maintenance (sp?) of the same condition without inside help...
an example would be a fish who lived in fresh water but then was moved to salt water and it could still live... there are fish like that

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MichaelXY
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Post by MichaelXY » Wed Nov 28, 2007 3:54 am


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MrMistery
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Post by MrMistery » Wed Nov 28, 2007 5:25 pm

homeostasis is the ability to maintain a constant chemical composition of the body.
The fish you described is what is named an eurihaline fish, that can tolerate large variations in salinity. Stenohaline fish cannot do this, and they still do have homeostasis.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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MichaelXY
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Post by MichaelXY » Wed Nov 28, 2007 9:46 pm

Well to quote Wiki
"Homeostasis is the property of either an open system or a closed system, especially a living organism, which regulates its internal environment so as to maintain a stable, constant condition. Multiple dynamic equilibrium adjustments and regulation mechanisms make homeostasis possible. "

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