Biology - January 2007

if I have a nerve cell with a membrane potential of 0mV, and if I make it permeable only to Na+ ions. WHat would happen? Does it reach the membrane potential for Na+ and the stimulus goes on and on?

2007-01-29 15:50:49 · 4 answers · asked by ABC 4

The food we eat provides the building blocks (e.g. amino acids and simple sugars) for making organic molecules and provides the energy for generating ATP. Humans would therefore be classified as:

A) Heterotrophs

B) Photoautotrophs

C) Chemoautotrophs

D) Photoheterotrophs

Now, I know it's not B) nor D) because humans do not use light to obtain energy, it's either A) or C) but which one?

2007-01-29 15:48:00 · 10 answers · asked by ♥Curious♥chick♥flick♥ 2

or, when was this first observed with a microscope?

2007-01-29 15:38:02 · 1 answers · asked by rubbawubba 1

The endosymbiosis theory suggests that mitochondria in eukaryotes originated when an archaeal cell engulfed a proteobacterium and retained the bacterium as an organelle. What evidence supports this theory for the origin of the mitochondrion?

It's multiple choice and the choices are:

a) The mitochondrion has a circular chromosome

b) The DNA in the mitochondrion is very similar to proteobacterial DNA suggesting recent common ancestry

c) The mitochondrion is replicated within the plant cell by binary fission.

d) All of the above

2007-01-29 15:34:34 · 7 answers · asked by Student_007 1

2007-01-29 15:29:23 · 5 answers · asked by kiwijuicepanda 1

2007-01-29 15:26:29 · 3 answers · asked by sweetandlow16530 1

For reptiles to evolve into birds? Did birds evolve into humans, or did reptiles evolve into humans? How long did it take for humans to appear from reptiles or birds?

2007-01-29 14:40:37 · 4 answers · asked by lirael1019 1

Heres the question: can a gene, be it one that causes a character trait or defect, die out? Or does it just become too recesive to be traced? With such a long history of humanity, I would think that some genes would have to die out and not be passed on to offspring. Please give a somewhat scientific answer, not just a "yes" or "no". Thanks in advance!

2007-01-29 14:36:28 · 6 answers · asked by Theredhairball 1

2007-01-29 14:32:31 · 1 answers · asked by delphina0723 3

2007-01-29 14:28:30 · 3 answers · asked by Anonymous

Please answer quick

2007-01-29 14:27:16 · 3 answers · asked by Amber C 2

I have been reading all about the ATP molecule, but I am not sure what advantages it has being the energy currency molecule.. can you help?

2007-01-29 14:17:44 · 1 answers · asked by skoolgirl 1

2007-01-29 14:05:07 · 2 answers · asked by Babybear 6

I am doing an introduction unit in biology on energy sources.
It would be helpful if you also answered these:
What is the energy source for a candle?
How is energy released in a candle, dead mouse, small plant and human being?
How do living things release energy that they need?

2007-01-29 13:37:18 · 6 answers · asked by Anonymous

2007-01-29 13:07:07 · 3 answers · asked by Anonymous

Another question that I cannot get any info on. this is becoming a pain. if anyone can help me... please & thank you. ( : c])

2007-01-29 13:00:11 · 3 answers · asked by K C M J 3

2007-01-29 12:57:45 · 1 answers · asked by Tanea 1

What would happen if you eat it?

2007-01-29 12:52:51 · 4 answers · asked by Amy Ramiya 2

i have some stupid project and i have to build a model of DNA

2007-01-29 12:40:03 · 3 answers · asked by Jeff 3

what i got is because of light microscope, scientists can view all aspects of different specimen, but i need more examples..

2007-01-29 12:37:49 · 5 answers · asked by majeczkaa 1

science question

2007-01-29 12:32:36 · 2 answers · asked by Anonymous

also what is icm cells?

2007-01-29 12:26:18 · 6 answers · asked by major 2

hint it wasn't Darwin

2007-01-29 12:23:25 · 11 answers · asked by Anonymous

what is the oldest remains of monkey skeletons found? i dont ever remeber them gfinding a million year old monkey.

2007-01-29 12:11:49 · 8 answers · asked by Richard C 3

I have done so much research already and haven't found a clue. I really need help! If anyone can give me the answer... please & thank you.

2007-01-29 12:11:14 · 2 answers · asked by K C M J 3

2007-01-29 12:09:05 · 4 answers · asked by omygosh 4

I'm pretty sure that there are 3 ways?

2007-01-29 12:00:19 · 3 answers · asked by rachel 1

2007-01-29 11:59:51 · 6 answers · asked by kenneth h 6

W=violet w=white

W_ x ww

If you use WW x ww you get all white. If you use Ww x ww you get half white & half violet. So how do you know which is the correct one?

2007-01-29 11:55:56 · 3 answers · asked by Emerson 5

If it exist, then why does the some believe in eugenics? Are not one they both the same ? Just one is man made.

If natural selection exist, then eugenics would not be needed being that it is virtually the same.

2007-01-29 11:52:34 · 8 answers · asked by ? 6