1
vote
0answers
4 views

Do animals commit suicide?

Do we have documented cases of animals purposely and consciously trying to end their own life? What leads to animal suicide, and is it preventable? I've heard mixed answers from various biologists. ...
0
votes
0answers
18 views

Are people born gay or not?

I am now really confused so I would be grateful if someone could answer my question. I will try to make my post as short as possible Today I have seen my old- best friend from high school ( We ...
0
votes
0answers
10 views

Hodgin-Huxley model for a single neuron

I am viewing (through edX ) an introduction course to computational neuroscience. In the second lecture, the Hodgin-Huxley model is considered. I am going over some of the questions and have ...
5
votes
1answer
107 views

Why do chickens not try to get up if laid on their backs?

I've seen a few videos about chickens being laid on their backs for a few seconds after which the chickens stay in that position until they are turned over. Comments around the video suggested that ...
5
votes
1answer
81 views

Are there any theories why such an imbalance in chirality of molluscs?

Most gastropods exhibit sinistral (right hand) winding of their shells. But very few species are anti sinistral. Have there been any theories as to why such a great difference?
5
votes
1answer
19 views

Why do humans require vitamin B12 supplementation while herbivores do not?

This question came about from reading this (very unclear) question, which the author did not properly clarify. Vegans are often recommended to take vitamin B12 supplements, as the vitamin is not ...
1
vote
0answers
21 views

What is the reason our body stops producing collagen/elastin?

Stops producing elastin at around 14 years old. Collagen -- at 25-30. What is the reason?
0
votes
0answers
6 views

What is internal symmetry in membrane proteins?

I have come across the term "internal symmetry" in the context of membrane proteins, but have never found a satisfactory definition. I'm struggling to figure out exactly what this term means... What ...
6
votes
2answers
158 views

How can bats hear such high frequencies?

I attended a talk that glossed over some biology as it was talking about a certain protein. The speaker mentioned humans can hear up to, often less than 20kHz frequencies, whereas bats can hear up to ...
0
votes
2answers
38 views

What is the cause of colours of nail

Why the nails are of white colour from bottom? then why they are pink and again white in the end?
1
vote
0answers
11 views

Which bird of Upper Michigan is it?

While doing morning-walk in Keweenaw Penisula, Michigan; I found this juvenile bird wandering around looking for her mother ! Can someone spot which bird is it?
2
votes
0answers
18 views

Evolution of the Redundancy of the Genetic Code

In short Looking at the genetic code, it appears that most redundancy is on the third letter rather than on the first or the second letter of the codon. Why has it evolved this way? Longer version ...
4
votes
0answers
14 views

How does the Platypus grow before it eats?

From this fascinating documentary on monotremes it is mentioned that the Platypus is born less than 1 cm in length, but has doubled its size by day three when it begins to nurse. How does the animal ...
2
votes
1answer
31 views

What determines the pathway of a neurological signal?

My question is about the neurological signals. In our body when a signal, for example a hearing signal from hair cells, is built, it goes through a lot of neurons and it passes a lot of synapses. I am ...
0
votes
1answer
16 views

What fraction of sites are expected to be polymorphic?

Question Consider a very long (eventually infinite) DNA sequence of neutral sites. Consider a panmictic population of constant size $N$ with a per site mutation rate of $\mu$ where all individuals ...
0
votes
0answers
24 views

About the small intestine's Vitamin K absorption and large intestine's Vitamin K absorption [on hold]

Why in the small intestine does Vitamin K absorb to the lymph, while in the large intestine it absorbs to the blood?
0
votes
1answer
16 views

Is 100% accuracy in DNA sequencing possible?

I would like to obtain a complete genome of a canine (with mitochondrial DNA too) at 100% accuracy. Is it even possible with the current technology? The source I have is potential degraded, i.e. dried ...
1
vote
0answers
11 views

Which taxonomic classification schemes are most accepted?

Since the taxonomic classification schemes followed by universities around the world are different I wish to know which are the most accepted classification schemes till date concerning the following ...
2
votes
1answer
15 views

Physiology of tricuspid and bicuspid(mitral) valves

The tricuspid and bicuspid valves are atrioventricular valves. Both are valves that prevent backflow of blood pumped from the atria to the ventricles. However, the former has 3 "flaps" while the ...
0
votes
0answers
11 views

MIN 6 cell culture [on hold]

I am trying to culture MIN 6 cell line. After one passage and about 5 to 8 days later the cells show round morphology,however I did not found any linkage between them they look all apart from one ...
4
votes
2answers
92 views

How does decreasing surface tension of lipids help to emulsify them?

According to my chemistry book, water has higher surface tension than lipids. But in my biology book it is written that "the gall forms an emulsion of water and lipids by lowering the lipid's surface ...
0
votes
0answers
16 views

Book recommendation on the human muscle system

I would like to learn more about the exact mechanism behind our movements, especially about what happens during intense training when anaerobic state arises.
1
vote
0answers
12 views

Negative association between habitat quality and reproductive success in birds

I'm looking for bird studies that have found either a negative correlation or no correlation between habitat quality and reproductive success. Or in other words, bird studies that have found that ...
3
votes
1answer
19 views

Need some good resources to learn about Protein function and structure

I'm taking a course on biochemistry at edx. Since I'm a computer science student, I'm having some trouble in understanding many biochemical concepts. While the first module was just fine, I found the ...
0
votes
1answer
16 views

seqtk trimfq using Parallel fastx_trimmer [on hold]

I'm new at this, and I'm trying to do RNASeq. I've done the quality analysis already with fastqc. Now, I'm on the quality control part. I need to use seqtk trimfq or fastx_trimmer to trim the first 5 ...
-1
votes
0answers
26 views

How do formic acid from ants causes acids? [on hold]

Ants release acids but how do they work? Ants release them for protection but how does it affect others?
-1
votes
0answers
24 views

Inducing Totipotency and Pleuripotency [on hold]

Totipotent cells can divide and differentiate into any type of cell. Pluripotent cells can divide into many types of cells. Is there any way to induce any of these? If yes, how?
-2
votes
0answers
23 views

How does carrying sea anemone help Hermit Crab? [on hold]

Sea anemone is carried by hermit crab. what is the advantage?
0
votes
0answers
41 views

Why does somebody have to take a live-long medication when diganosed hypothyroidism? [on hold]

My wife was diagnosed hypothyroidism 2 years ago by her general practitioner and she has to take L-thyroxine to compensate that. It started with 50mg and as she went to further examinations to check ...
2
votes
0answers
35 views

Skin extra sensitive to heat after burn

I just got my finger burnt (first degree burn $\Rightarrow$ I didn't even bother to bear the wound). It didn't hurt much, even when I pressed the wound. However, when exposed to heat (hot water, but ...
1
vote
1answer
36 views
4
votes
0answers
52 views

What is basis of multifunctionality of “master glands” in the endocrine system?

I have just started reading about the endocrine system and I am having some difficulty understanding the basis of distribution of glands and associated hormones. I am using multifuntionality to ...
6
votes
1answer
38 views

Do butterflies pass over migration patterns to their offspring?

So, earlier, I read online (http://io9.com/butterflies-remember-a-mountain-that-hasnt-existed-for-509321799) that Monarch butterflies veer east during their southward migration to avoid a mountain ...
6
votes
0answers
21 views

How does chromosome fusion get fixed in the population?

It's well known that one of human chromosomes is the result of fusion between two chromosomes in a primate ancestor. If we put anthropocentrism aside, it becomes clear that fusion events happened a ...
2
votes
0answers
40 views

Efficient algorithm to calculate various population divergence statistics

Intro and description of the data I am simulating the evolution of very long DNA sequences. The model works well, is performant and will output data in the following kind of fasta format ...
4
votes
0answers
22 views

Spatial learning in microorganisms

Has there ever been an experiment performed that demonstrated a form of 'spatial memory' in a unicellular organism? I'm imagining something analogous to the classic 'rat in maze' experiments, but ...
0
votes
0answers
24 views

How to measure the biomass of hydroponic plants in netpot/rockwool DWC system?

I'm doing an experiment with 4 kale plants, each in their own small deep water culture (DWC) system. Each plant was transplanted in rockwool with netpots and clay pebbles. But I need to periodically ...
4
votes
1answer
44 views

Did any dinosaur molt?

Like snakes or lizards, did any dinosaur molt ? if yes, have we any proof of it ?
6
votes
1answer
50 views

What is the biochemical explanation for tingling and burning sensation in brain due to certain food?

Consumption of mustard (spicy English Mustard), wasabi and horseradish based food dressings usually result in a burning, tingling or freezing sensation in the brain/scalp and nostrils as the vapour ...
0
votes
1answer
57 views

At what saltiness will water simply pass through us?

If water has a low salt content, it hydrates us. When water has too high salt concentration, like sea water, it drains water out of us instead when we drink it. At what salt concentration would water ...
2
votes
0answers
12 views

Which hydrophobicity scales are best for detecting transmembrane regions, and why?

There are many hydrophobicity scales for protein analysis. Broadly, I gather the differences between them are from the experimental method to acquire the data and the normalisation (or lack thereof) ...
-1
votes
0answers
42 views

What biology should be known by a newly married couple? [on hold]

What is the minimum useful biology that a couple entering married life must know? I guess the knowledge must pertain to a basic understanding of the nature of reproductive system and use of ...
2
votes
1answer
106 views

Why do some people burn and others tan?

Connected to What is happening when we get a tan? - Why do some people burn while other people tan? Very pale people tend to just burn while other people tan very nicely, what causes this difference? ...
0
votes
0answers
19 views

Cut-off values for LD, LOD and D-prime as algorithmic input

I created an algorithm to generate SNPs for random people of different descents - based on HapMap data. While this works good, there is something else I want to take into consideration. So if a SNP ...
11
votes
3answers
2k views

What is happening when we get a tan?

Almost everyone nowadays wants that nice summer tan, but what exactly is going on beneath the skin? I've heard a few different theories about tanning - such as a tan is nothing but the pigmentation in ...
0
votes
2answers
58 views

Evolution of insects, spiders and jellyfish

Well we all learned at school the classic evolutionarily theory ...
0
votes
0answers
10 views

What is the concentration of leptin in white adipose tissue in mice? [on hold]

I am trying to perform an ELISA experiment and for this I need to know the physiological concentration of the hormone leptin in white adipose tissue in mice.
3
votes
1answer
167 views

Beetle with long, slender iridescent green body and orange legs

I recently saw this beetle while on a trip in central Texas, USA (in a rural area just before sundown). The body was about 2-3 inches long (compare to nearby chair leg and floorboards) and had a long ...
3
votes
0answers
39 views

How many animal species are larger than humans? [on hold]

I sometimes think about just how huge humans are in comparison to most animals. Even compared to a squirrel, which is really a pretty large organism in the grand scheme of things, humans are hulking ...
1
vote
1answer
39 views

Choosing the best assay for my experiment?

Which of the following assays can be used to determine whether cell death specifically due to apoptosis has occurred in a given cell sample? Choose all that apply. WST-1 Assay Caspase Colorimetric ...

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