7
votes
2answers
222 views

Does becoming martyr have an evolutionary advantage?

This is related to How does "be altruist to those who are similar to you" evolve? Altruism that is Not reciprocal Not familiar has little explanation. One possible explanation is that ...
9
votes
3answers
12k views

Healing process in mouth wounds

When we have an external wound the wound generally tents to clot and there is a layer of solid scab formed. Now,Yesterday while brushing my teeth i somehow hurt my gums and it got all bloody but ...
1
vote
0answers
166 views

Is whey-protein folding an example of micelle in water? If not, what is it?

I can find a lot of information about protein folding in water but not about whey-protein-folding in water that body-builders use with filtered shakers. Without filters, you get protein balls -- is ...
4
votes
1answer
127 views

Epilepsy explained by computational neuroscience

A few years ago, on my maths masters, I did a module in theoretical neuroscience. I was shown that the mathematical framework the course developed for neurons, with a small adjustment in the ...
10
votes
1answer
1k views

Is the eukaryotic nucleus composed of a single or double membrane?

I know that it is usually considered a double membrane like those surrounding mitochondria and chloroplasts, but I read a review that stated "according to topological details it is actually a single ...
3
votes
1answer
2k views

What factors are known to affect evolution?

My understanding is that the possible mechanisms of evolution are: Environmental changes Cultural/mating preferences Population Immigration Genetic Mutation Am I missing anything? I've heard that ...
2
votes
2answers
139 views

Gametes of two different species

I always wondered why gametes from two different species dont fuse together to form an offspring. eg a donkey (sperm) and a female dog (egg) I know this is not possible but I'm just curious.
1
vote
1answer
135 views

How to manufacture different sized micelles in nano -scale?

I am trying to answer q5: "How can you manufacture micelles in A) nanometerer -scale B) and in ten nanometer -scale?" My Thinking Observations and some thinking Oil in ...
2
votes
1answer
241 views

What happens to colloidal particles in a liquid medium? And how to stabilize it?

Definition Colloid is a dispresion of small particles of one material in another. Definition 2 (Wikipedia) A colloidal system consists of two separate phases: a ...
5
votes
2answers
96 views

Do somatic cells alter their own nucleotide sequence?

I seem to remember reading that embryonic cells will frequently replicate the section of their genome containing rDNA by splicing in duplicate genes. The cells use this to produce ribosomes at a rate ...
3
votes
1answer
97 views

How do susceptible organisms prevent parasites from overcoming resistance?

Bt corn is genetically modified to kill borers, but "regulations require farmers to plant conventional varieties as well, which is intended to stop the borers becoming resistant." -Source How do ...
5
votes
2answers
174 views

Are there other mechanisms for mutation besides imperfect DNA replication?

I was reading http://www.askamathematician.com/2012/05/q-is-quantum-randomness-ever-large-enough-to-be-noticed/ and saw: [...] the evolution of entire species can be changed by a single mistake ...
7
votes
2answers
1k views

Why animals can move and plants cannot in general?

To clarify, I think the answer should be able to explain: What are animals? What are plants? What's the difference between animals and plants (How do biologists differentiate them, if they ...
1
vote
1answer
316 views

What animals stop other members of their species from mating and why?

(In particular primates) I know chimps do. Powerful alpha males chimp would beat up omega males that they caught mating. I know gorillas do. Powerful alpha males gorillas would beat up omega males ...
1
vote
0answers
37 views

How many pandemic H1N1 2009 virus sequences were submitted by the Indian NIV as of May 10, 2010? [closed]

The handout I was following is maddening. It says; "Go to the NCBI home page and select 'All Resources (A-Z)' and choose GenBank. Follow the NCBI Flu Resource link to determine how many pandemic H1N1 ...
13
votes
2answers
214 views

What is the contribution of viruses to the evolution of mankind?

I'm interested in horizontal gene transfer in bacteria, viruses, and organisms such as Bdelloid Rotifers. I've just read in Carl Zimmer's 'A Planet of Viruses' the following passage: As a host ...
4
votes
1answer
221 views

Cause of short sightedness/ far sightedness

I recently had gone for an eye test. The doctor told that short sightedness/ far sightedness is caused due to shrinking or expanding of the eye. One thing i forgot o ask him was what causes that ...
3
votes
1answer
98 views

Cucumber on the eyes

In many spas and salons I have seen people place a cold cucumber on their eyes. I think this might be for coolness, but why a cucumber? And Is it actually for coolness or for something else (like ...
22
votes
1answer
12k views

How does laughing gas (N2O) work?

Laughing gas (N2O), well, makes people laugh. How does just a gas make us do that, there has to be some hormones at work... So, I wanted to know how this works? What is the mechanism?
1
vote
0answers
56 views

Are the intestinal flora substantially different within a diverticulum of the colon?

From the Wikipedia page for the vermiform appendix: This proposal is based on a new understanding of how the immune system supports the growth of beneficial intestinal bacteria, in combination ...
8
votes
1answer
1k views

Is there a maximum amount of antibodies your body can keep?

I am wondering if you were theoretically able to get vaccinations or antibodies for any and every diseases and/or illness, would there be a limit to how many you can get and keep in your body at one ...
6
votes
1answer
106 views

Bicoid regulation of hunchback

I'm learning about development via the example of Drosophila embryogenesis. I understand that bicoid regulates hunchback, among other genes. My question whether the regulation is direct or indirect? ...
7
votes
1answer
356 views

How Does Green Tea Increase Metabolism?

According to the article "Green Tea Supplementation Affects Body Weight, Lipids, and Lipid Peroxidation in Obese Subjects with Metabolic Syndrome", Green tea increases metabolism and fat loss: ...
2
votes
1answer
5k views

What are the differences between white and brown adipose tissue?

What are the differences between white and brown adipose tissue? Here are some that I have come across: ...
4
votes
1answer
192 views

intravenous (IV) in the tail vein of an anaesthetized mouse

I trained myself to do intravenous injection on live mice. However, on anaesthetized mice you don't see the flux of your product showing that your injection was successful. In the same way, on live ...
9
votes
2answers
311 views

How is human biological clock modelled in modern science?

Im an engineer by education and i program a lot, so the question sounds weird to people from other disciplines. Im trying to better understand the human biological clock. Yet i do not really know ...
4
votes
2answers
696 views

Why is proteinase K digestion performed at 50 °C?

Many DNA isolation protocols use a Proteinase K digestion to remove proteins. This is often performed at 50 °C. Why is this?
7
votes
3answers
523 views

The evolution of dogs through domestication and artificial selection

I am currently reading Richard Dawkins's book 'The Greatest Show On Earth: The proof for evolution' and in the second chapter he talks very much about the evolution of dogs. He says centuries ago ...
13
votes
1answer
3k views

Why do we grow so much hair on our heads compared to our bodies?

I've been wondering about head hair, facial hair in particular. Human males can grow very extensive beards should they choose to not shave - however you do not really see this in our chimpanzee ...
4
votes
1answer
51 views

How to find ion/water channel related genes

We now have a collection of transcripts at hand. We would like to investigate some particular ones, which are ion/water channel related. How to perform this? Could anybody point out how to find the ...
3
votes
2answers
112 views

What risk to DNA does long-term exposure to low-dose radiation pose?

A new study from MIT scientists suggests that long-term exposure to low-radiation poses no risk of DNA damage for mice (it is also important to note that mice are unusually susceptible to cancer). So ...
6
votes
2answers
394 views

Modern Whales with Vestigial legs Myth?

Is it a myth that modern whales have been found with hind legs sticking out of their sides and full formed tibias, fibias, and toe bones? I keep finding assertions, but no citations. For example, the ...
1
vote
1answer
995 views

What are the positive and negative effects of insulin on cognitive function?

A UCLA study seems to imply that insulin interferes with cognitive function. The DHA-deprived rats also developed signs of resistance to insulin, a hormone that controls blood sugar and ...
4
votes
1answer
56 views

What value type would a chromosome position be in a database or form?

I wanted to create a tool for some fields like SIFT, Phenotype, etc..so for example I know Phenotype will have "Text" values or SIFT will have some determined values from a drop down list...but what ...
5
votes
1answer
183 views

Are quaternary protein monomers unique to a particular protein complex?

I know that quaternary protein structures are formed exclusively via non-covalent bonds. My biochemistry professor discussed a viral capsid that is essentially one quaternary structure with 240 ...
1
vote
1answer
221 views

Human Body “Fat” Equilibrium

Here's my theory: If you consume x calories each day with y amount of caloric expenditure each day you gain zero weight, regardless of x and y being out of balance. If you then mechanically ...
6
votes
1answer
73 views

Question: Annotation search in scientific literature

In a scientific paper I have been studying ("Predicting Novel Human Gene Ontology Annotations Using Semantic Analys" S.Draghici et al., 2010), I have read that authors checked the accuracy of their ...
10
votes
2answers
170 views

What makes E. coli yellowish?

LB, TB media, and yeast extract are also yellow but at the heart of the question. What chemical(s) make E. coli yellow?
6
votes
1answer
185 views

Decreasing the alcohol proof and faster in hangover, why?

My russian friend says that the USSR agents used/use the trick that they offered the victim first vodka and then last wine. I have noted that this puts you faster to hangover: decreasing the alcohol ...
4
votes
2answers
80 views

Genetic networks vs genetic architectures?

What is the difference between the terms genetic network and genetic architecture? I've heard both in a variety of contexts used by different people, so I am interested in what people think they mean, ...
1
vote
2answers
2k views

Restriction Mapping of Plasmid Assignment

pUWL22 is a circular, double stranded, 10.5 kb plasmid. It contains a gene encoding an enzyme that confers ampicillin resistance in the host bacterium. Cloning into the kpn I and Sst I sites ...
10
votes
1answer
13k views

How to store vegetables in the refrigerator: In plastic bags or not?

My wife and I are having a debate similar to this one: I claim that it's better to take the fresh veggies out of the bags and put them in the crisper with humidity control because: That's what the ...
38
votes
4answers
17k views

Death because of distilled water consumption

One of my friends said that I would die if I drank distilled water (we were using it in a chemistry experiment) I gave it a go and surprisingly did not die. I did a bit of Googling and found this ...
9
votes
5answers
639 views

Finding and Comparing Homologous Genes

I have a gene of of interest that I would like to compare between homologues. How does one go about finding a gene from known coding sequences across phyla? Afterwards I imagine I could do a Clustal ...
6
votes
1answer
368 views

Is it purely the nervous system causing vaginal lubrication (arousal)?

My girlfriend was watching some documentary on TLC about a paralyzed woman getting pregnant. I believe that woman still has some feeling, as she spoke about feeling the effects of a bladder ...
10
votes
1answer
2k views

How does translational coupling work in prokaryotes?

Today I heard about a phenomenon called "translational coupling", where the translation of one protein influences the translation of another protein. The messenger RNA levels don't seem influenced. ...
11
votes
3answers
312 views

Number of beneficial mutations cataloged?

I can see from Wikipedia that there are possibly thousands of harmful mutations that have been cataloged and linked to disease. There are also unnumbered neutral mutations. But, does anyone know how ...
5
votes
1answer
616 views

What generates variation in a species?

What is the biological mechanism behind the variation within sexually reproducing species? Obviously, the children are combinations, to differing degrees, of their parents. But how does the variation ...
5
votes
2answers
641 views

How long is DNA stable in a freezer?

Inspired by the post about extracting pet DNA, how long would genomic DNA be stable for in a -20°C freezer? It is common practice to store DNA (double-stranded, plasmid) in a -20°C freezer in ...
8
votes
2answers
128 views

What is the effective relatedness of inbreeding?

If a human inbreeds with a relative, how distant does the relative have to be before the homozygosity in the child is no higher than if the mate were randomly chosen from the global population?

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