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If Darvin knew about genetics or even about what mendel was researching, how do you think it would have changed his theories?

What is the biological definition for survival? What does an organism need to survive?

What makes truss bridges so strong? Like if you have something supported by triangles, why is it good? I don't really understand the physics behind it.

Hi, I want to know how the Insulin/Glucagon hormones act as negative feedback. Blood sugar goes up, insulin is created, blood sugar goes down, glucagon is created, blood sugar goes up again, and they basically compete with each other to maintain homeostasis, right? But how is this negative...

okay thanks for replying everyone... I guess the question is more ethical... In a biological sense, it's all about survival, but its not like humans are only JUST survivng. They are impacting the course of evolution for many species but its not necessary (for pure survival). What I'm trying...

Humans have a big influence on the evolution process of many species. Do you think they should? Is this fair?

Okay I handed in the assignment already, I THINK I figured it out... here's what I put... Basically I said the post glomerular blood goes through a second capilllary bed before it connects to the vein system. In that capillary bed there might have been some more water absorbed therefore the...

We are learning the excretory system, and are given a thinking assignment. Okay so we are given a bunch of values for concentration of the substances in the kidney. Basically the post-glomular blood (blood after being filtered by glomerulus) has a little more protien concentration than the...

Ohh I see...thats pretty cool, actually that question just came up in physics class lol, we're studying electricity and magnetism I just wanted some more insight... I'll check out the thread though thanks...

What do magnetite crystals found in some bacteria exactly do? I heard it helps them move around but, how would that work? Can they not move on their own? Are they always only affected by the Earth's magnetic field?

Ohhh okay that makes sense. lol I don't know why i didnt see that, thanks.

A machine that un-ionizes the air in your home. How would it remove particles that have charge out of the air?

In the future ...would the impact of gene manipulation be positive or negative? If there are limits to the way the technology is used, it would be positive right? We could cure a lot of diseases...

Ohh I see... so basically this type of geometry is not consistant? Also, is gravity an axiom, or a proof? Because, it's self-evident but there's nothing to assume...I can see how the number 1 is an axiom because you have to assume it exists since it's abstract... But what about gravity? It is...

lol... okay I understand the axioms... Whats Euclidean geometry :( .

Moving finger, I was following you up until you said logical consistency... What exactly do you mean by this? Our views on reality must be consistant because there is no real way of proving anything.. so we have to follow some model? And make it logical? Also you agreed that all proofs are...

Nothing can be proven then, except doubt... ?

Decartes sounds interesting... Icebreaker, so a proof is based on ASSUMPTIONS, which are self evident... ? Maybe I don't understand this but If its based on assumptions, is it really proving anything?

Ive been reading most of the posts on this board, and from the "how much of our life is in our minds" post I came to think of something ...how can anyone proove anything to anyone else? Some people would say that science is prooves things but I think it's just sort of making an attempt to prove...

but why was there a prokaryotic cell to begin with?

what if you go back to when the time the first cell was made? Isnt that all environment?

Interaction... can you give me an example? and explain how it differs from saying "both" ? what about nature and nurtured being connected or dependant on each other?

im aware of that story... But from what I know, both sides nature and nurture have good points... but IS there a problem with making a conclusion to that debate saying it's merely both?

does nature or nurture shape us? isn't it just both?

Moonbear you're right I was asking more of a "how" question... "Why" they are shaped a certain way is because of biological evolution... Okay I understand that survival of the fittest thing (saltydog) but doesn't that hold true for all human cells? tissues? organs? not just nerve cells...

I see so they have evolved to be this way that's cool. They receive signals from other cells from their dendrites but why? Why do they exist? Let me try to answer this first... Well our nervous system is made up of these neurons and the brain makes commands which travel as signals along...

Why are neurons shaped the way they are?

Ohh ok, I see, thank you.

hi thanks for replying Well ok I understand that cholesterol makes the membrane less fluid, like as you said due to the bending... well it makes it LESS fluid when there's a lot of energy in the cell membrane (temperature high) ok which is how it keeps the cell membrane together, but how...

hi, my textbook shows how cholesterol sort of patches the cell membrane together, keeps it at optimal fluidity... I was just wondering how cholesterol is able to do this... I am in grade 11 biology I am not being tested on this or whatever I was just wondering if anyone knew...

Oh I see... all right I will research them then. Its cool that you guys know these answers right off the top of your head... I was like that with some basic ones, lol it feels good to know stuff.

lol... Yeah I know I can google it. Just thought it would be fun if I posted it.. If I got no replies it wouldn't matter that much anyways since I -can- google it.

Hi I have to bring in items on this list from my home... Maybe you guys can help me in identifying some of these items or just telling me how to go about finding some of them... 1. a model of a molecule (I could construct one?) 2. a result of a chemical change (hmm?? baking soda + salt or...

I see, I don't think in this course we dive that deeply into electronegativity... basically my teacher just mentioned the general trend across the table... But its good to know, thank you.

Thanks a LOT that REALLLLY helped me out in terms of the atomic radius and ionization energy trends... We are asked only to look at the general trends in this course so the subshell stuff about ionization energy was extra... But why does having a half filled p subshell make N harder to...

Hi we did a lab today for testing compounds in foods... So basically the only way to detect if a lipid is present is by transparency? Like we used a paper towel, we added a few drops of the substance to the paper towel and then rubbed it today, if it was transparent it tested positive for...

What are the periodic trends? I need help with them.. Regarding atomic mass, (first) ionization energy, electronegativity and anything else I am missing. Specially atomic mass, well as you go down a group and atomic number increases, atomic radius increases, ok this makes sense.. number of...

thats right argon not helium lol sorry... thanks

Hi we're beggining to label the orbitals with s p d structures...grade 11 chemistry The question is "Explain why the 2+ ion is the one that tends typically to form" Ive answered the question above this one which says "Ca element 20 forms a 2+ ion. Write the electron configuration of neutral...

Yes, you are absolutely right... today the teacher confirmed that there is no right or wrong answer. You may think there is too much saturated fat, or not enough, we can't evaluate that yet... Thanks a lot anyways

Hmmm... We havnt covered calories or nutrition or LDL/HDL ratios we were just told a read a section on lipids (we did a bit on carbs before this) and the teacher outlined this question as being a hard one... like I got all the other ones I was just wondering if I could figure it out myself...

Hi I've just started grade 11 biology and I am having a problem with one of the homework questions... "A 100-g health food bar is advertised as being low in saturated fat. The total fat listed as 32.2 g, while polyunsaturates are 1.2 g and monosaturates are 14.4g. Saturates are 5.0 g...

Hmm... I see... thanks for the replies guys Well it's not a big deal because it's just a lab, we're going to have a small OPEN BOOK quiz on it, but we have to use our notes hmm... See the problem is the teacher won't tell us the answer... We have to observe... and for this level I think she...

Hi I have just started grade 11 chemistry... We're reviewing from grade nine a bit and in class we did an experiment where we had copper(II) sulfate in a test tube and we heated it, and then let it cool and added water... Ok well we have to classify this as a physical or chemical change.. but...

Wow... I just spent like 2 hours reading a bunch of stuff on that site. That helps out a LOT on understanding the concepts related to this unit. It also somewhat confused me... The parts about electromagnetics... and CHARGE was harrrddd to understand, I think I sort of got it now... But I...

Hi my grade 11 physics class is on its final unit (Electricity and Magnetism) and I am a little lost... So far we are doing Charge and Voltage (we learned the formulas)... and we're expected to know that circuit diagram stuff and Ohm's Law? lol a bunch of stuff we were suppose to learn in grade...

thats right, thank you :)

lol... sorry for posting again but now I am confused about frictional force on my roller coaster... When an object reaches the top of the loop of a roller coaster, what direction is it traveling in? Friction force will be opposite of that direction... At the exact top of the roller coaster...

Oh my god... thank you soooooooooo much

Hi I have to draw a freebody diagram for FN (normal force) of an object at different locations on my rollercoaster. Where would FN be located when the object is upside down (going through a loop) ... would it just be straight down? (like gravity) ? Because FN is always perpendicular to the...