Biology

hi. I have a doubt and I would appreciate your response. What is the role of cell membrane in organ function? and What is the role of cell membrane in the preservation of organ donated for transplant? I know that cell membrane primary function is to allow specific material to go out and in of the cell.

It is believed that mutation occurs at a steady and slow rate (I know this from book), however, I doubt the point. As everyone knows, innumberous disaster occurs in the history of life, during disasters, for example, an explosion of cosmic ray, may increase the number of mutations in a great degree, so at these times, the so called 'steady and slow' mutation rate is disturbed. So, todays, people uses protein as an indicator to find out the time for two species being apart form the life tree. For instance, if an amino acid difference between corresponding protein in two species represents 50 thousand years (i.e. one amino acid changes from one to another for each 50 th…

Hi everybody. I was wondering if anyone out there knew what the structural components of the ECM are. No need to include things like cytokines or other signaling type molecules. I already know about hyaluronan and collagen being major players in providing a framework, but that's it. Thanks

Hi, I have a quick question. When you replace the functional group of a fat with a phosphate what do you get?

Sympathetic nervous system stimulates the contraction of sphincter muscles in the urinary bladder THats mean there is no urination during emergency or fear !!! However , Often did human relate fear with uncontrolable urination this is totally oppossite !!!! can anyone give a clearer picture ??

which is E Coli belongs to ?? an Eukaryote or a Prokaryote ?????

Do you know how high fleas can jump? If you do, post the answer as a comment. Oh, and no cheating by looking it up. Come back tomorrow and I'll post the answer. For more facts visit Science and Fun. Or if that doesn't work, copy and paste this into your browser http://www.fun-science.blogspot.com Oh, yeah be kind enough to leave some comments!!!

Hey guys. I'm re-learning about osmosis in the school and I received this paper to answer. You can say I'm asking for homework answer but really, I can still get full credit by saying something "scientific" (the teacher doesn't check this ardently). But I really would like to know what's the right answer so I'm posting here. 1. When plant cells lose sufficient water, the internal pressure of the cell membrane pressing against the cell wall is (reduced, increased) and they (lose, gain) turgor pressure. My answer: reduced and lose. My explanation (this is unnecessary but here's why I think is): I know that in plant cells, cell walls restrict expansion by creating …

If cold viruses invade your body, your body's immune system may destroy most but not all of these viruses. How does your body's immune system affect the evolution of the cold viruses? How does the increase of resistance to antiviral drugs in HTV relate to the theory of evolution by natural selection?

1. The information needed by a pancreas cell to make insulin is stored in its cells molecules of _______. 2. Why should we limit the amounts of saturated and hydrogenated fats in our diets?

It is the most illegal substance by law. And yet it is produced naturally for it. When you are in deep sleep, you are committing a serious crime - possession of a class A/Schedule I. A lot of religions, shamans use it as a experience, religious. Laws have been passed to make this legal, in areas of Brazil. DMT occurs naturally in many species of plants. It is in nearly everything, as it is speculated that it is needed for us to survive, and is a self defense mechanism for when we sleep. Conspiracy theorists say it is what the aliens control us with. It can be smoked, injected or snorted. Smoking gives you the most epic experience. Originally Posted…

http://news.bbc.co.uk/2/6057734.stm According to an "evolutionary theorist" (economist), H.G. Wells was right and we'll get Morlock and Eloi-like subspecies of humans. Also we'll do okay until the year 3000 at which point we'll begin a gradual decline thanks to overdependence on technology. There will be the beautiful, smart, tall desirable people and the short, ugly, stupid undesirable people. The Eloi-like men will have larger penises and the Eloi-like women will have pert breasts.

Just thought I should share this. It gets boring after a while, but still amazing. Be sure to watch the Giant Centipede VS Tarantula video too. Edit: Is this better off in general discussion?

Hi, how long does a cell, normal and cancerous, live outside a living host?

hi i'm new here, and i have a biology project for school i have to do thats due in a few weeks called Cell Theme Park Model. Basically i have to model a theme park but each part of the park needs to resemble a part of a cell. For example, the information kiosk can be the nucleus. I need to know what i should do with all of these though: Nucleus = (Information Kiosk?) any other sugestions? Nucleolus = ? chromatin = ? cytoplasm (cytosol) = (the land the theme park is on?) endoplasmic reticulum = ? ribsome = ? lysosome = ? golgi body or apparatus = ? microfilaments, microtubles (cytoskeleton) = ? centrioles = ? mitochndria = ? chloroplast = ? vacuole = ? cell m…

We all know in physics and chemistry that there are several simple, mathematical laws/rules/concepts that apply to everything, such as E=mc^2 or that oppositely-charged atoms/molecules attract each other. However, biology seems to have things tougher: evolution has given us such a cornucopia of diversity that general laws are hard to find. So, here's the challenge of this post: find general, over-arching concepts that pervade either all of biology or at least a major subset of it (all animal life, all plant life, all molecular biology, all ecology), and explain them. I'll go first, with a rule near and dear to my heart: Size matters. Every living organism mov…

I was wondering if anyone knew some natural buffers found in the soil of Georgian Bay protecting the region from acid precipitation? I'm having a hard time researching this and i was wondering if anyone could help me out. It doesn't have to be detailed (unless you feel compelled to), if you could simply just name some that would be sufficient for me, i can then research it and make the connections. thanks

The following link leads to a page on the CBS network's Quirks & Quarks website from which you can download the mp3 file of the piece on hibernation research. The page also includes a written synopsis of the piece detailing each of the main points in brief. http://www.cbc.ca/quirks/archives/05-06/feb11.html It is all very interesting and potentially revolutionary stuff. A very great many questions have occured to me whilst studying this page and the links to the various laboratories mentioned at the end. Some questions are only fit for a theology or more philosophically oriented forum, but I have two which I will pose here: 1. The methods described rang…

My mum today brought home a dozen free range eggs and strangely every single one contained two yolks inside it. I found this to be quite odd, would they most likely all have come from the same hen? Is it drugs?

It is my understanding that there is a lower limit to the number of individuals required to constitute a genetically viable population. In other words, Adam and Eve alone could not found a successful population. The resulting population would die out due to a lack of genetic variability. I have read something of genetic bottleknecks and the Mount Toba eruption theory which, among other things, seek to explain the morphological differences which characterise so-called human "races". I understand that during the nuclear winter which followed the eruption, which is considered to have taken place about 60,000 years ago, some groups of humanity were sheltered from the w…

I came across types of two flows in my advanced biology book today. It's part of the concepts in exam but our teacher really didn't go over it so I'm asking here to see if I understood it. Two flows are the flow of chemical nutrients and the flow of energy within an ecosystem. Flow of chemical nutrients are like oxygen, water, and carbon oxide while flow of energy is basically "energy." The difference between those two is that while flow of chemical nutrients is constantly going on as "cycle," the flow of energy doesn't do that. Like say energy A goes into the ecosystem. It starts from plants to the animals and after animals used it, it goes out of ecosystem with ener…

I came across this long word in my crossword assignment. Interestingly, I can't find this answer anywhere in the book while I got all the other ones without even looking it up. Explanation: Fungi and prokaryotes that "eat" dead plant and animal matter Answer is 11 letter word which is like this: _ e _ _ _ p _ s _ _ s Thank you!

how is CO2 transported in our blood stream ?? Does it dissolve in water in blood plasma physically to form dissolve CO2 ?? or dissolve in water in blood plasma chemically to form carbonic acid !!

in the synthesis of insulin in the lab .. the e coli is the ideal choice for amplifying the insulin !!! However the synthesis of Factor VII for haemophilics is not inserted to a bacterial cell but a MAMMALIAN !??!?! i am briefed with the answer : mammalian cells have Golgi apparatus for modification of polypeptides after the traslation of factor VII my question is why insulin is synthesised using e.coli but Factor VII is in mammalian cells !?????? is it mean that insulin need no modification after translation ????

An experiment is carried out to show that xylem is responsible for the transportation of water in plant. A plant which soil on roots has been removed is used in th eexperiment. The roots of the plant are bathed in a stained solution, after three hours, thin cross sections on stem, roots and leaves are cut and the sections are examined under microscopr. Red stain substances are found in where xylem is located. It is claimed that xylem is responsible for the transportation i plants then. However, I would like to ask, whether experiments which show that the stain is not related to the water uptake through xylem are necessary to be carried out before the conclusion is made…