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Apr
19
comment Why did the Brain develop in the front in most organisms?
@aandreev -- They co-evolved. As brains became more complex and bigger, there needed to be a better place to store them. Thick bones aren't very spacious. Hollow bones aren't very protective. The compromise for organisms evolving a larger brain was the skull: A hollow, encapsulating bone that can also be very dense (especially among goats, bovines, etc.). It's also a design that means there's only one area to protect instead of every single thick bone in your body.
Apr
19
answered Why did the Brain develop in the front in most organisms?
Apr
4
revised Core Biological concepts explained to a Computer Scientist?
added 6 characters in body
Apr
4
comment Core Biological concepts explained to a Computer Scientist?
@poka.nandor Thanks. :-)
Apr
4
revised Core Biological concepts explained to a Computer Scientist?
added 2 characters in body
Apr
3
answered Core Biological concepts explained to a Computer Scientist?
Feb
25
comment Baby birds hair and mammal hair is a convergent evolution?
Fledglings do not have hair, but "down" -- a very, very fine type of feather used to insulate the chicks (and convergent in purpose with mammalian hair there).
Feb
6
comment Does long term use of antibiotics in humans actually lead to a greater risk of infection?
Not usually in the individual, but in a population, improper antibiotic use can lead to resistant strains and more infections. Improper use usually means stopping therapy short and not using all the pills, using antibiotics for diseases they cannot help with, or very-long-term use in a healthy individual. Antibiotic resistance is basic a probability function, with the increase exposure to the antibiotics increasing the probability resistance will develop. Regimes are designed so that bacterial populations stay isolated/small and the chance for resistance remains small.
Jan
22
comment Is there any tree or other plant that produces a new crop in fast cycles?
@twelve -- I'd suggest something like gardening.stackexchange.com for people more knowledgeable than I. I'm a novice gardener, but from what I recall most people would need 2-3 basil plants to cover moderate to heavy use of the herb in their cooking from early spring through early fall (in climates where temperatures drop below freezing).
Jan
22
answered How much mass does a person lose in a day through breathing and perspiration?
Jan
22
comment Is there any tree or other plant that produces a new crop in fast cycles?
Several harvests occur from most agricultural plants, most have 2-3 harvest periods per year, with a few exceptions. I'm not aware of any plant that produces a new crop every month; the closest I can think of would be herbs like Basil -- but that's because it produces continuously until it goes dormant.
Jan
22
comment True or false & fill in the blanks
@canadianer -- I agree, the nomenclature is pretty arbitrary and can be misleading. Thanks for bringing it up. :-)
Jan
22
comment True or false & fill in the blanks
@canadianer -- Yeah, but the nomenclature conventions make "polypeptides" to usually 3-5 peptides chained together. Before is "dipeptide" and after can get up to "oligilopeptide" IIRC.
Jan
22
answered True or false & fill in the blanks
Jan
18
comment how do macrophages have the capacity to digest pathogen in opsonization
There are multiple mechanisms to induce phagocytosis by macrophages. One includes B-cell antibodies (specifically the Fc region) and another includes chemokines emitted by local cells that can also induce phagocytosis. I do not have my material with me at the moment, but the short answer is: Macrophages can do both. They can eat pathogens without antibody stimulation, but antibodies can also stimulate them into action.
Jan
16
comment Father with mutated mtDNA- why isn't his offspring at risk?
@anongoodnurse "Paternal Inheritance of Mitochondrial DNA in Mice" - Nature 1991. The truth is that some paternal mtDNA is passed along, but the undergrad level generalization is that "no" paternal mtDNA is passed because the amount is practically non-existent outside of rare cases. In those rare cases then mtDNA can cause metabolic issues, like the 28 year old case study by Scwhartz in 2002.
Jan
15
answered Father with mutated mtDNA- why isn't his offspring at risk?
Dec
2
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