6,881 reputation
1133
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location Salt Lake City, UT
age 30
visits member for 2 years, 7 months
seen 23 hours ago

Graduated with a B.S. in Biology, Minors in Chemistry and English Literature from the University of Utah.


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
11
comment Are there ATP parasites?
No time for a fully sourced answer, but: Probably not, and it depends on your definition of "Parasite". If you want to consider viruses parasites, then yes. If you're talking free-living organisms who use hosts for reproduction, then you'd be looking at intracellular parasites like Malaria (P. vivax, etc.). As-is, I am not aware of any intracellular parasites who only use ATP -- most will utilize every energy source available to them.
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 gene for 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 gene for mtDNA- why isn't his offspring at risk?
Dec
2
awarded  Popular Question
Oct
2
comment How long does a signal from the brain take to reach the limbs?
@Christian - Roughly half, I'd assume. A full reflex arc is from a sensory neuron to the spinal column and back out to the muscles. The difference is probably due to length and the added junctions.
Oct
1
comment How long does a signal from the brain take to reach the limbs?
@shigeta - They're some overlap (the Vagus is a good example), but the function maps to the fiber type fairly well since space is the primary limiting factor for the peripheral system. However, I'll admit I haven't refreshed myself of the topic for a while, so it's possible the ratios are less strict than I believe.
Oct
1
answered How long does a signal from the brain take to reach the limbs?
Sep
30
awarded  Explainer
Sep
25
comment What is a catalytic domain of an enzyme?
AFAIK MattDMo is correct. The catalytic site is the active site where the reaction takes place that triggers the conformation change. He is also correct about there being nearly infinite potential catalytic site designs.
Sep
24
awarded  Autobiographer
Sep
22
awarded  Proofreader