5
votes
1answer
33 views

Evolution of diversity and extinction resistance

I saw a comment on an answer to another question that touched on an interesting topic: keeping diversity is useful for parameter exploration or to adapt to future environmental change My initial ...
5
votes
2answers
149 views

Are we more attracted to people of the same ethnicity? [on hold]

Are humans more attracted to people from their own ethnic groups? I ask this because most of the time people have relationships with people of their own ethnicity, and I wonder if it's purely social, ...
3
votes
1answer
67 views

What is this small black bug found in Turkey?

What species is this? It was found in Turkey. It was dead, I did not kill it.
1
vote
2answers
22 views

Autotrophic and heterotrophic organisms in anaerobic condition

Can both heterotrophic and autotrophic organism survive in anaerobic conditions? If an autotrophic organism does not produce carbon dioxide but requires oxygen, it should not be present in anaerobic ...
2
votes
1answer
31 views

Database of medically validated SNPs

I'm looking for all possible sources of clinically tested human SNPs. There is a handful of databases that store SNPs (like dbSNP), but I only need those that have validated presence/absence of ...
16
votes
3answers
994 views

Why does the face turn pale in dangerous situations?

I know what the effects are of a dangerous situation on the brain, i.e., an activation of the hypothalamic-pituitary-adrenal (HPA) axis which eventually results in an increased heart rate and elevated ...
1
vote
0answers
25 views

How to be a Noah-esque biopirate and store the genes of every plant and animal [closed]

Preamble. Please criticize this idea. It is too romantic to be possible. All of the news about the sixth extinction got me thinking about it. Thanks The price of DNA sequencing for humans has ...
-1
votes
0answers
29 views

What did the transition from ovipary to Hemotrophic viviparity look like? [closed]

Most evolutionary changes happened slowly over countless generations. Richard Dawkins illustrates this beautifully in Greatest Show on Earth when he describes lining a rabbit up next to all her ...
2
votes
1answer
24 views

If a trait does not appear to be advantageous to organism, why does the organism have it? [duplicate]

Why do organisms have some traits that do not appear to have any evolutionary advantage?
3
votes
0answers
22 views

What is the meaning of conservation site in miRNA-mRNA pairing context?

I am not biologist and just work in Bioinformatics field. Does anyone know what is the meaning of conservation in the context of miRNAs and their pairings to mRNAs? Example: Each of these duplexes ...
0
votes
0answers
24 views

IC50 and area under the curve

I was hoping to get some clarification on how drug response data (i.e. IC50) are presented. On publicly available datasets like Genomics of Drug Sensitivity in Cancer, area under the curve (AUC) ...
4
votes
2answers
53 views

Exhalation while holding breath

If you inhale to your maximum capacity and hold your breath for an extended period of time, it begins to feel uncomfortable; slowly releasing your breath at this point seems to provide relief from ...
0
votes
0answers
25 views

Why do human have continuously-growing hair on their head? [duplicate]

Why do hair continuously grow on human heads, while the same doesn't happen on other parts of the human body? Where there are hair, they only usually grow to a fixed length; but they seem to have no ...
2
votes
1answer
42 views

What causes head hair to be different than body and face hair?

If you feel your head hair, it typically feels a lot softer and is easier to manage (comb, brush, fix) than a lot of other hair on your body - specifically I'm thinking about beard hair and pubic ...
2
votes
1answer
26 views

Which process is right to describe V(D)J recombination? RAG-1 and RSS recurring process

I'm studying V(D)J recombination. I think I have two incompatible books about explantaion of the process. Which is right? In Molecular Biology of the Cell 5th Ed., firstly RAG (-1?) combines to RSSs ...
4
votes
3answers
945 views

Why is wind cold for humans? [closed]

Coming out of the pool the other day, I felt very cold because I was wet and the wind picked up. My idea is that a "cold" feeling should be associated with low temperatures, but it's indeed wrong. ...
-1
votes
1answer
17 views

is left brachiochephalic vein and left pulmonary artery is same?

I am reading about ligamentum arteriosum which connects the left pulmonary artery and descending aorta. But I am seeing that if any figure shows left brachiochephalic vein it does not show left ...
-4
votes
0answers
19 views

Southern blotting [closed]

i am a student at the University of Reading studying Biological Sciences and one of my modules is called Practical Recombinant Genes exercise. We were given some questions to answer for our exam ...
3
votes
2answers
32 views

Deciding a reasonable threshold for copy number variation in a CNV (SNP array) TCGA dataset

Is there a methodology to select a reasonable threshold for copy number variation in a CNV (SNP array) TCGA dataset, to define when there is a significative alteration? Can I download CNV data for ...
-1
votes
0answers
18 views

Is spore print counted as organic material? [closed]

A friend of mine is travelling in the Netherlands and he came by a shop which sells spore prints. As far as I know, in my country it's illegal to get organic materials from other countries. I wanted ...
3
votes
0answers
14 views

Why is the administration of exogenous Anti-D not harmful to the foetus?

Haemolytic disease of the newborn can result from Rhesus incompatibility in utero. In this disease a Rh-ve mother becomes exposed to the antigens of a Rh+ve foetus by fetomaternal haemorrhage causing ...
-2
votes
0answers
56 views

Why does human hair grow over our eyes [duplicate]

As many people who are overdue for a haircut will know healthy human hair will eventually grow to cover your eyes. I wonder- why is this so? In the modern world it is not a problem. We have invented ...
2
votes
0answers
15 views

Genetic tests on S. cerevisiae to determine mutation locus on genes

I am studying the metabolism of galactose in the budding yeast Saccharomyces cerevisiae. After a random mutagenesis screen, several mutant strains were isolated that grow well in glucose but are ...
0
votes
1answer
20 views

Ways the structure of the pancreatic acinar cell relates to its function?

So the pancreatic acinar cell synthesizes, stores and secretes digestive enzyme precursors called zymogens e.g. pepsinogen. The structure of the acinar cell shows that there is an apical and basal ...
-2
votes
0answers
25 views

How many human cells will get affected at the prick of a pin? [closed]

Wikipedia states that there are 10^14 cells in a human body. My question is if I was to take a needle or a pin and pierce it just 2 mm in the body, how many cells will I be piercing? Thank you in ...
-2
votes
3answers
100 views

Immortality Gene? Really? [closed]

I read somewhere in the internet and wondered if human genes have deactivated immortality genes locked somewhere in the DNA strand. Is this statement true? What does it mean for human lifespan?
0
votes
0answers
37 views

Can Kit fox and Red fox produce offspring?

Can a Kit fox (Vulpes macrotis) and a Red fox (Vulpes vulpes) together produce offspring? Would such a hybrid be fertile?
2
votes
1answer
23 views

If one endures the same form pain over a long period of time, would the pain begin to lose intensity?

Metaphorically thinking, if one endured the pain of constant burning for decades, would the pain slowly lose its strength?
2
votes
1answer
32 views

System biology and evolution: Book-recommendations

I have relatively good knowledge in evolutionary biology and in population genetics. I am getting more and more interested in the evolution of ... genetic developmental processes gene interactions ...
7
votes
1answer
708 views

Lumosity.com? Is it based on science?

I always see these Lumosity adds on TV, and I personally feel they are just trying to "sell me something". I did some layman's research(wikipedia) and read that "Studies of Lumosity's effectiveness ...
6
votes
3answers
60 views

Mutation That Loses Stop Codon

Someone asked this in my class and my instructor wasn't sure in her answer, doesn't anyone know what happens in protein synthesis if a mutation causes mRNA to not possess a stop codon? Would the ...
2
votes
2answers
27 views

Defining Resistance and Sensitivity Thresholds for IC50

I have a dataset containing IC50 data for each of my cell lines and up to 80 drugs. Basically for each drug I want to be able to define an IC50 threshold where if a cell line has an IC50 above that ...
3
votes
1answer
57 views

Does learning increase the number of neurons in the brain?

I am attempting to understand neurogenesis related to learning. Does learning increase the number of neurons in the human brain? What would be some good scientific publications to read?
1
vote
0answers
35 views

How nerves interact with other cells? [closed]

I read in a book by Mick O'Hare, that injuries inflicted by electric current are caused by tension of your muscles. Is that explainable only with physics or nerves really use electrical signal as ...
0
votes
0answers
16 views

Why is polysome loading affected by double stranded structure?

Why polysomes are not able to load properly onto a transcript if a transcript has a double-stranded structure in it?
7
votes
1answer
311 views

How do female hormones cause blood to clot?

On most female-hormone supplements you get a warning that is something like this: The use of a combination hormonal contraceptives (CHC), like NuvaRing, is associated with increased risks of ...
1
vote
1answer
28 views

Why cooked food considered nutritious if proteins decompose at much lower temperatures?

Food is cooked/baked at temperatures that are significantly higher than what's considered normal for proteins/amino acids (40°C). Then why such food is still considered nutritious after cooking? ...
2
votes
1answer
23 views

Do Blanding's Turtles die of old age?

I have recently found articles and various claims that turtles (Blanding's turtles as an exact example) could possibly live indefinitely. http://discovermagazine.com/2002/jun/featturtle This is said ...
3
votes
0answers
35 views

How to understand relatedness in an infinite island model?

My understanding is that the relatedness coefficient in kin selection models measures positive assortment. That is, altruism is more likely to evolve if altruists tend to interact with other ...
4
votes
1answer
462 views

What happens to the red blood cell in CaCl₂ solution?

Here's the problem: One red blood cell is placed in a hypertonic solution of NaCl, another is placed in a solution of CaCl2 equimolar with the NaCl solution. What would you expect to happen and why? ...
5
votes
1answer
31 views

How are the physiological properties of mitochondria measured?

this is my first question on BiologySE. I am a Physics and Mathematics student currently doing a project on cell growth simulation. I am doing literature survey and I have a question about cellular ...
6
votes
2answers
103 views

Which part of human body sustains most pressure when standing up straight?

Let's suppose a healthy fit barefoot young adult standing comfortably on a flat solid surface. A reasonable guess is somewhere around the foot. But is it the ankle, the heel, or the Metatarsus?
1
vote
2answers
47 views

What's read depth in VCF?

There is an attribute defined as DP (Total Depth) in VCF file format. For example, http://www.1000genomes.org/node/101. What does this attribute mean? If I get a value of like DP=128. How can be that ...
0
votes
0answers
42 views

Can the use of only one ear lead to disorders/negative effects on the brain in general? [closed]

I have always wondered if listening to music only by one side could lead to some type of disorder. EDIT: I'm just talking about listening to a single ear piece of an mp3 player(left or right). Let's ...
-1
votes
1answer
42 views

What is enrichment? [closed]

Could someone please clarify, in layman's terms, what enrichment means? I'm currently looking at MACS and peak calling. Repeated mentions of "enriched" or "enrichment". Thanks.
3
votes
1answer
81 views

Michaelis-Menten equation type - how it is derived?

Can somebody explain how is the following differential equation found? It is about the blood alcohol content. See this article (pages 3 and 4). They say the concentration of blood alcohol ...
1
vote
1answer
31 views

Recommendations for an intro level virology textbook?

I'm a college sophomore, and I was just accepted into a research lab that works with retroviruses. Since I haven't taken any classes on the topic yet, does anyone have recommendations for good, ...
8
votes
1answer
110 views

Identify this caterpillar

Could anyone try to help identify this caterpillar, there are loads of them all over my garden and I've got three of them in a makeshift caterpillar house. I've had them for about a week and they've ...
-4
votes
0answers
20 views

plant-pollinator interaction [closed]

Which of the following is a general nature of plant-pollinator interactions? A. Tight one to one co-evolutionary partnership B. A plant species is pollinated by a few pollinator species C. Plants rely ...
7
votes
1answer
71 views

Plant identification in Turkey

What species is this ? It is a stinky, hairy plant. I have found it nearby a river. It had reached a height of 1 meter. Bloomed three weeks ago. Found in Turkey.

15 30 50 per page