4
votes
1answer
116 views

Redundancy of the genetic code

One particular codon codes only for one amino acid, but an amino acid can be coded for by several different codons. Now according to the genetic code, the codon UUU ...
4
votes
2answers
520 views

Does trypsin strip flask coating?

Mammalian cell/tissue cultures sometimes require flasks coated with proteins. My uneducated guess is that these proteins mimic the ECM, perhaps the basal lamina, so finicky contact-dependent cells can ...
1
vote
4answers
758 views

Are neural connections one-way?

I'm trying to think about how two neurons communicate, typically shown in pictures as an electric pulse traveling along a long, thin connective tissue. Is this depiction somewhat accurate, and if so, ...
4
votes
1answer
1k views

Why Do Nerve Signals Get Crossed?

First off, I don't know if this is a normal healthy thing to occur. There have been many times where I have an itch on say my arm and I scratch it, only to feel the scratching elsewhere on my body. I ...
0
votes
1answer
164 views

Earliest and latest onset of Huntington's Disease(Chorea)?

Huntington's disease can hit at any age, although it tends to hit middleaged people most often. What is the youngest and oldest person that has exhibited Huntington's? Clarification: By oldest I mean ...
2
votes
1answer
68 views

Sequencing a specific region of a genome

First off, I'm new to bioinformatics and I am learning about DNA sequencing. Let's say that I knew that a specific region of a genome which contained information about a disease (whether it a person ...
2
votes
1answer
219 views

DNA methylation on the forward vs reverse strand?

I'm wondering if there are meant to be differences in DNA methylation between the forward and the reverse strand of the gene? I'm wondering because in primer design for bisulfite pyrosequencing one ...
5
votes
2answers
227 views

How is it possible to even hope for an ebola epidemic of this current size to remain contained to a relatively small part of Africa?

As of 2014-09-14 at least 5347 cases of ebola have been identitied. Some estimates are much higher. While experts are sounding the alarm to try to get sufficient resources to contain the outbreak, ...
9
votes
2answers
2k views

To what extent is Ebola airborne? (aerosols)

Recently, CIDRAP at the University of Minnesota announced that Ebola may be more transmissible through aerosols than previously thought. I lack the familiarity with the field to critically evaluate ...
11
votes
2answers
2k views

How long does the Ebola virus remain infectious on contaminated items or surfaces?

I'm sure there will be variation depending on what the contaminated item or surface is made of - linens, I could imagine, would remain dangerous for longer than a door-knob. But if the items are not ...
4
votes
2answers
136 views

Is ebola non-contagious until symptoms appear? Why?

There's been a lot of talk lately about the man who recently came down with ebola in Dallas, Texas. While I live elsewhere, I keep hearing quotes from CDC and state officials that ebola is not ...
1
vote
1answer
61 views

What are the reactions in the body that triggers dizziness after cigar(nicotine) smoking in non-smokers?

Suppose there is a person that has never used nicotine in any form in his/her life. Why does the person get dizzy after a few "shots" from a cigar(nicotine)? What's the difference between using other ...
2
votes
1answer
165 views

The biology behind tree pruning and hedge trimming

I read two contradictory arguments which both seem logical to me, related to the tree pruning and hedge trimming: You should prune/cut trees only outside the growing season, when the tree is ...
2
votes
3answers
99 views

Is the quality of sleep dependent on sleep duration?

I've been facing this lately, where I will wake up in the middle of the night after sleeping for perhaps 2-3 hours and be wide awake, but when I go back to sleep, I wake up more tired than before. ...
9
votes
2answers
2k views

Fate of erythrocytes after splenectomy

The spleen is considered a graveyard for red blood cells. So in case of Splenectomy (complete surgical removal of the spleen), what would be the fate of red blood cells? Would this cause Polycythemia? ...
1
vote
1answer
40 views

What controls gut motility?

I have two different papers. One claims that gut motility is reduced by stimulation of the Opioid κ and δ receptors. The receptors are activated by Morphine and certain derivatives, specifically ...
0
votes
0answers
27 views

Gastroenteritis virus causing mutation of the Enterochromaffin cells

I am working on the solution to a worldwide problem: IBS or chronic diarrhea following a viral gastroenteritis infection. I think I have an answer. The only missing piece to the puzzle I found in a ...
3
votes
2answers
490 views

How did aquatic dinosaurs go extinct?

Dominant theory is that 'normal' dinosaurs went extinct from ether super volcano or meteor impact or combination of both. However there were aquatic dinosaurs that are not present at this day. Was it ...
8
votes
1answer
190 views

Can a human cell live indefinetely in a controlled environment?

How long can a human cell live in a controlled environment, given all necessary nutrients, temperatures, mechanisms for waste removal, and other requirements are provided for? Put differently: Can a ...
2
votes
1answer
57 views

Are added yogurt cultures harmful to the gut?

I have read somewhere that the live culture added to yogurt acting as "healthy" gut bacteria are actually synthetic and harmful. Any truth to this? If so, what are some alternatives to getting good ...
3
votes
1answer
127 views

How is Microenvironment strictly defined?

I started to think this definition of Wikipedia: Microenvironment (biology), a small or relatively small usually distinctly specialized and effectively isolated biophysical environment (as of ...
4
votes
4answers
2k views

Do male animals visually perceive females as more/less attractive?

If we somehow remove pheromones, do animals experience a phenomenon similar to human "visual beauty" when looking at members of the opposite sex? For example, given a set of 20 female ducks observed ...
7
votes
1answer
2k views

What about a bat's immune system protects them from Ebola?

Current evidence indicates that fruit bats are a reservoir host for Ebola. Has any research established what is different about their cell biology or immune system that reduces virulence for them? ...
5
votes
1answer
105 views

Are all functions of a human cell known? [closed]

Please bear with me as I'm intruding into your world from a computer science background. In programming, once you have created a program, you know all functions of that program. Thus, 100% knowledge ...
3
votes
1answer
229 views

What does the root “phyllum” mean used botanical binomial nomenclature

I often encounter the root "phyllum" in bionomial names in botany, but I've had trouble finding an actual definition for this root in any Latin dictionary outside of its taxonomic meaning. From ...
5
votes
1answer
104 views

Can the negative afterimage appear only if there is light or is it possible in darkness?

Reading the following paragraph: After staring at the red and blue shamrock, you saw a green and yellow afterimage. Opponent-process theory proposes that as you stared at the red and blue ...
1
vote
2answers
129 views

What kind of technology is required for plant seed DNA printing? [closed]

I'm a programmer so I have little knowledge in the field of biology. However I have an interest in plants, GMOs and DNA (in terms of programming). So, I want to know what kind of technology is ...
3
votes
1answer
232 views

Ideal lab glassware cleaner for molecular biologist

I'm using Alconox powder detergent to clean my laboratory glassware, the powder is a pain to store near the sink and to use. Would like to make a concentrated liquid to use in its stead. I have ...
1
vote
1answer
29 views

What enables azacitidine to incorporate into both DNA and RNA?

I did a mini-project on the drug azacitidine for my pharmacology class, and I learned that azacitidine has the ability to incorporate into both DNA and RNA. I think this is really unique because a ...
2
votes
1answer
53 views

Concentration of caffeine in physiologically relevant setting

Caffeine is known to overcome G2/M (and possibly other types of) cell cycle arrest through its effects on DNA repair machinery and is used as a positive control in studies of cell cycle arrest. In ...
4
votes
1answer
106 views

What is the name of this plant with many purple blooms with orange inner parts?

I have photographed the following plant in Pittsburgh, PA. It has many blooms and every bloom is very small (about 5mm diameter), purple on the outer and orange in the inner. You can see it here: ...
1
vote
1answer
126 views

How prominent is the gene-centric view of evolution among professional researchers?

Richard Dawkins famously advocated a gene-centric (as opposed to organism-centric) viewpoint on natural selection, most notably in The Extended Phenotype. However, I have also heard "on the grapevine" ...
1
vote
1answer
654 views

How do ants transport water?

All living things need water to survive. Worker ants can drink directly from the source. But a queen ant would need help from the colony to get its daily supply of food and water. I have seen ants ...
3
votes
0answers
32 views

More extreme phenotypes when parents are from diverged populations

In quantitative traits we have many loci affecting a trait. If we took a bunch of parents where all mothers and fathers were of a certain value at the upper end of a trait range, and then looked at ...
1
vote
0answers
36 views

Physiology of benign eye twitching?

About four times in my life I have experienced the feeling of my eyelid fluttering for a few minutes by itself, and then it stops. I have talked to other people who have had the same experience so I ...
1
vote
1answer
52 views

How non-invasive blood glucose concentration measurement work? [duplicate]

Diabetes patients need to conduct the “fingerstick” a few times a day. One of the mechanisms of "fingerstick" is to take small amount of blood sample and put it onto a test strip. The enzyme on the ...
0
votes
1answer
105 views

How non-invasive blood glucose concentration measurement work?

Diabetes patients need to conduct the “fingerstick” a few times a day. One of the mechanisms of "fingerstick" is to take small amount of blood sample and put it onto a test strip. The enzyme on the ...
18
votes
5answers
1k views

Pipetting damage on cells

I'm curious how much damage is potentially inflicted by shear stress by pipetting. I know that with syringes for stem cell injection cause a lot of damage. However, to what extend does this happen ...
3
votes
2answers
4k views

Is there any complex organism that is both autotroph and heterotroph?

Possibility also include "adaptation mode" if such exist. I don't discern whether autotrophic/heterotrophic part play only minor role either.
3
votes
1answer
87 views

Found a larva in my broccoli, is it a Small White (Pieris rapae)?

Found this living larva in broccoli from a store. It was about 10 mm long. It was in july this year, and I don't remember the country of origin for the broccoli. A bit of googling makes me think it ...
3
votes
0answers
104 views

Niche differentiation in birds of prey

I'm not much of an ornithologist but I know enough to distinguish most Central European birds of prey. To me it is amazing that there are so many species that seem to occupy the same niche. Especially ...
3
votes
1answer
3k views

Do you produce more sperm after 1 week of abstinence vs 1 year of abstinence [duplicate]

Question: I was wondering if the amount of sperm increase with the amount of abstinence? Side questions: Is their a max amount of sperm? What happens with the excess amount?
1
vote
2answers
107 views

What are the sources of energy that alcohol provides?

Milk contains sugar and proteins which give energy. What compounds in alcoholic beverages (edited) give energy? Are they more likely to turn into fat (as in beer belly) than blood glucose?
1
vote
1answer
95 views

Can you find malaria parasites in saliva?

Can you find plasmodium parasites (malaria) in saliva under microscope from someone who's infected? Or it's only in the blood?
8
votes
2answers
82 views

What is this beetle? Found in heather in snowdonia

We were walking in the hills of snowdonia the other day and my girlfriend found this in the heather: I've never seen anything like it. Can anyone identify it? It was the biggest beetle I've ever ...
3
votes
3answers
1k views

What is the difference between eugenics and evolution by natural selection?

So with the working definition of Eugenics: "the aim to improve the human gene pool". What are key features that distinguish Eugenics from evolution by natural selection? I mean, besides that natural ...
1
vote
1answer
95 views

Difference between medicinal caffeine and regular caffeine

There are some OTC paracetamol tablets, some with caffeine. Is this caffeine the same as the regular caffeine (found in a coffee)? Does it perform better than it in any way?
7
votes
2answers
351 views

HIV and effectiveness of inhibitor cocktail over single inhibitor

I'm looking for clarification on the answer to this question. It's in my biochemistry class but I figured this is more Biology than Chemistry, so I'm asking it here. The question is: One of the ...
1
vote
1answer
56 views

Forum on synthetic biology and hypothetical biology?

I am interested in synthetic biology, but not a scientist, and would like some advice on where to look for an online forum on synthetic biology and creating fictional species and animals or if someone ...
10
votes
3answers
301 views

Shortest strings not present in the human genome

What length are the shortest strings of DNA not present in any known person's genome, and what are they? And is there a database online by which I could find this out?

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