Biology

While teaching a class of 11 year olde I was stumped by the question why is bogey green? Any help would be appreciated

Has a name been given for the evolutionary "halt" when an organism is so well adapted to its environment that any genetic mutation is detrimental or unnecessary? A prime example: the fossils of certain diatoms and mosses species found in Antarctica... "To be able to identify living species amongst the fossils is phenomenal. To think that modern counterparts have survived 14 million years on Earth without any significant changes in the details of their appearances is striking. It must mean that these organisms are so well-adapted to their habitats that in spite of repeated climate changes and isolation of populations for millions of years they have not beco…

I read about it but I don't get it. I can understand how current would flow if one side is positive and other negative but I don't understand what is happening in an axon +++++++++++++++++++++++++++++++++ _____________________________________ I don't understand how current is flowing is it flowing vertically?. What is this electric impulse? Also since at resting potential there is a difference of voltage. Why doesn't this cause electrical impulse. Please help. Thanks

How exactly do obligatory hematophagous organisms that undergo hematophagy use blood to energize themselves? Is it the plasma they are drinking? What kind of metabolism do these creatures have? Is it the Kreb's cycle they are working off of or something else? And can we expect a radically different iron metabolism in them?

I want to know is it biologically possible for enamel or dentin to be formed not only on the teeth but also in the bones? Won't this organism have a stronger skeleton?

Why is our heart on our left, and not on our right? One would say that there could be some evolutionary advantage to this, since dextrocardia situs inversus totalis rarely occurs. I understand that there's normally less space on the right side because of the liver (the stomach is compressible), but what if all visceral organs are inverted? Is this merely a result of genetic drift?

apologies if this is in the wrong forum i've been wonderering why your farts dont smell very bad to you but do to other people?

Can anyone help shed some light on this? Is it settled already? I can't take a sip of coffee without envisioning pancreatic cancer which, I am reading, is a quick and merciless sentence in most cases. Is it worth the risk? I'm confused and seeking your scientific opinions. A few links: http://www.cancer.org/docroot/NWS/content/NWS_1_1x_Pancreatic_Cancer_Is_Not_Linked_With_Drinking_Coffee_or_Alcohol.asp http://www.nytimes.com/1981/03/12/us/study-links-coffee-use-to-pancreas-cancer.html Thanks.

I was looking for a detailed account of human procreation. Does sperm contain the preliminary information that tells to host how to form the embryo, i.e. the first cells, blood, bones, organs etc. Sperm is a cell correct? So it carries the information that details how other cells are created? Do polypeptides make up tissue and if so what happens after polypeptide synthesis? Do the polypeptides sequence differently to create tissue, etc. Or is everything in the human body made up of cells and the initial sperm cell has the information for the creation of all the other cells?

Hey guys, Can anyone give me a good explanation of the digestion of food within the stomach please? Not so much about the enzymes but how it works physically and the job of the three muscles, how they move the food? Any help will be much appreciated! Thanks .

In the past year, I've come across a new hypothesis that states that the kinetochore is responsible for the pulling feature that occurs in anaphase. If I remember how the experiment to prove such a theory occurred, what happened was that the tublin proteins that attach from the centromere to the kinetochore were fluorescently labeled. From there, a laser was shined across a band of the kinetochore to see which part of the protein chain was shortening. It was found that the kinetochore is moving toward the centromere and the centromere is not pulling at all. Thus, this suggested that the kinetochore is somehow chewing up the tubulin like a person eating a person of lic…

Why do cats lick their fur? I understand it is for hygiene reasons, but given that they are ingesting some of what they clean off their fur, doesn't that make it a hygiene risk rather than an advantage?

I don't know anything about bionics and I want a good book that introduces bionics so i can learn the mechanics behind Bionics and how a human mind can control machine. So far i haven't gotten any luck "googling" or "amazoning"....you just get fiction books and some $100 text book. I would have gone with the $100 text book but i don't know if it is good as an introduction to bionics or is it reliable. so as the title says, can any1 recommend a book that introduces bionics? maybe there are also physic books or engineering books that introduces bionics?

Anyone have a picture of a mitochondrion in a ovum? I can't find one. I'd probably have to search for hours/days for a picture of one in some journal. Otherwise, I don't think I know where I could find a picture of a mitochondrion in an ovum. Hence, I tried Google. If you know of a journal article that shows an obvious mitochondrion in a gamete, that will work, too.

In the sympathetic nervous system, is it the dorsal (sensory,afferent) roots of sympathetic nerves that give the sensory information to the CNS about sympathetic things or do they only do the action? Thanks!!

purely hypothetically, could a human live on nothing but animal blood?

i have a feeling i have already asked this before but it wont show up on search so i am asking again... are blowfly puparia made form chitin? if not then what are they made from

Hello, I live in Alabama and am looking to find information on the fastest germinating weed or plant that will grow in the area. I cant seem to find any information on the internet. Everytime I google the word "weed" I get some interesting results, none of which are the ones I am trying to find. Any help on this would be greatly appreciated. Thanks

What is the variation in number of synapses in the human cortex, and what is the relation between this number and IQ?

If anyone comes across reports of the numbers of synapses in animal species (any at all) please let me know.

I read that migraine is caused by inhibition followed by hyperactivity, associated with vasodilation followed by vasoconstriction. How does this work? And how does depolarization fit in all this?

I remember hearing or reading something about people who have had brain damage, and the information that was lost or hindered was moved elsewhere to another part of the brain, (as I understand it, similar to RAID configuration with Hard drives, but instead, with neurons). Is this true? and is it possible? I cant recall if I read an article on it, or if I saw a movie and it had that in there. When 1 neuron (or whatever stores information in the brain) is damaged, or pathways severed, the information is often stored/backed up in another neuron? So here I will present an example of I think happens, and someone please tell me whether this is true/possible: O…

Wiki-The Starling equation is an equation that illustrates the role of hydrostatic and oncotic forces (the so-called Starling forces) in the movement of fluid across capillary membranes. So is it water that moves out or do solutes dissolved in water move out as well. Simply is it water or fluid(including solutes) that move out.

Ok I researched but I don't understand what they are saying. Transpulmonary pressure= alveolar pressure-pleural pressure= elastic recoil of the lung. How is transpulmonary pressure equal to the elastic recoil of the lung? I don't understand what you get when you substract pleural pressure from alveolar pressure. Also while I was reseaching this pneumothorax came up. It seems that elatic recoil of the lung is pushing one way and the chest wall is pushing one way. When equilibrium is reached between these two pleural space is negative. So when you puncture air fills the pleural space and becomes zero. So how does this make the lung collapse? Thank you!! Moon…

Hi all. Lunatic questions... Could an apple tree branch receive a lettuce sprout and develop ? -Different botanic families . What are the limitations, compatibilities or guidelines ? What determines feasibility ? Could a mangrove get a tomato grafting ? Could a pine bear avocados ?