0
votes
0answers
6 views

Immune system suppressed

I have noticed that many times, it seems that during the night, my immune system got suppressed. This leads me to wonder, does the immune system get suppressed when we are sleeping and why?
2
votes
1answer
27 views

Are there histones present in the cytoplasm?

In this paper the authors depleted core histone heterodimers H3-H4 at 90 % from the cytoplasm of Xenopus oocytes. They state that their concentration is in the order of 6 uM. My question is, are ...
-6
votes
0answers
12 views

What is this weird bug?

I found this strange bug and I am not sure what it is, but you can see it here: LINK REDACTED It appears to be contracting around. I believe these kind of questions are on-topic for this site.
1
vote
0answers
41 views

Do genetic modifications exist to enhance the taste of tomatoes?

GM tomatoes seem less tasty. Has there been any research on GMOs with regard to taste? Can scientists introduce a gene to, let's say, tomatoes, which would enhance the flavour? If not, why?
3
votes
1answer
25 views

Is pulse rate measurable in the capillary bed and venous vasculature?

Pulse rate is easily felt when gently pressing the arteries in the wrist or neck region (Fig. 1). Fig. 1. Feeling the pulse at the radial artery. Source: Wikipedia Arteries supply the thin ...
2
votes
1answer
33 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 ...
-2
votes
1answer
32 views

Why do aquatic animals smell so bad?

Many have experienced the "fishy" smell prevalent with seafood, but why do aquatic animals smell so bad? Is it because of salt water?
0
votes
0answers
6 views

population ecology life table data

Does there exist a centralized repository of population data of animals? I'm just curious about comparing trends of many species. I'm thinking about something that might look like (of course, this ...
9
votes
3answers
3k views

Why do humans find baby animals cute?

Why do humans find baby animals like cats, dogs, ... so cute? As these are potential competitors (when grown up!) or even natural enemies (like e.g. tigers, leopards, ..), the protection instinct ...
4
votes
4answers
191 views

Why can't you just take a vitamin? Why you need a healthy diet on top of that?

From what I understand, your body needs certain amounts of vitamins and minerals to maintain health. Why can't we just take enough pills to obtain these vitamins and minerals?
4
votes
1answer
31 views

What determines the thickness of Cornea?

In eye-operations such as Lasik and Femto, the thickness of cornea is key decision factor whether the operation is feasible. A normal thickness is between 500-600 µm. Cornea consists of a very special ...
10
votes
4answers
1k views

Help identify this worm-like thing

Many instances of this worm-like creature were found in a water system for a mountain cabin in the Sierra Nevada mountains of the US, in late June / early July. The water system collects water from ...
-1
votes
0answers
43 views

What are the effects of alcohol on Dolphins? [on hold]

I have seen that dolphins appear to use blowfish to get high for recreational purposes. What I was wondering if someone has noted their demeanour while consuming alcohol? In humans alcohol acts as a ...
1
vote
1answer
14 views

Genetic linkage greater than 50 centimorgans

Classically, the linkage between two loci can be measured in centimorgans (cM), which represents the percent chance that these two loci will recombine an odd number of times (generating a recombinant ...
2
votes
0answers
6 views

Cellulose acetate membrane filters vs. glass microfiber filters

At equivalent pore sizes and pressures, which exhibits faster flow rates, cellulose acetate membranes or glass microfiber filters? I know cellulose acetate exhibits low protein binding, but what ...
1
vote
0answers
14 views

Can Nanodiscs be used to study membrane energetics?

Nanodiscs have changed they way we can study the structures, insertion, and functions of transmembrane proteins. Below is an image of a nanodisc bilayer. The key difference, as far as I can tell, ...
1
vote
1answer
40 views

Plasmid gene knockout

How do delete a single gene encoded in an operon on a plasmid using E. coli? Could you use the same principle as when knocking out a gene from the bacterial chromosome which is e.g. suicide ...
-1
votes
0answers
18 views

how can modern biologist solve the problem of hunger and malnutrition? [on hold]

Modern biologist can solve the problem of hunger and malnutrition by producing high yielding varieties of foods and more nutritious foods.
0
votes
0answers
15 views

Understanding F-statistics in population genetics

I am reading a classical Weir and Cockerham 1984 paper about Fst estimation. At the beginning (first page, right column), they define 3 statistics. $F$ is the correlation of genes within individuals ...
3
votes
1answer
21 views

How does pressure measured by sphygmomanometer translate directly to blood pressure?

If I understand correctly, a sphygmomanometer when wrapped around the arm and inflated only measures the pressure of the air inside the cuff, right? How does that translate directly to the pressure ...
-1
votes
0answers
52 views

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

People suffering from hypothyroidism have to take L-thyroxine for the rest of their lives. This strikes me a bit, doesn't the thyroid have a self-healing ability? For example, the liver and lungs are ...
5
votes
2answers
62 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 ...
-3
votes
0answers
14 views

Why animals like cattles have less sized breast when compared to humans? [on hold]

Why animals like cattles have less sized breast when compared to humans? Even cattles produce more milk than humans.
-2
votes
0answers
14 views
6
votes
2answers
142 views

How does LCR compare to Assembly PCR

The question pretty much explains itself. How do the two methods compare? I've always used Assembly PCR but the method is prone to mistakes and I'm curious how it compares to Ligase Chain Reaction ...
-1
votes
1answer
23 views

Critical discussion: Gene expression and systems biology allows us to understand the control of complex traits

I'm having a bit of trouble tackling this question. Any help on what I should write about or the points I should mention would be much appreciated. I keep seeing articles about eQTL and QTL are these ...
-4
votes
1answer
69 views

How significant is the genetic component of homosexual behaviour?

From some basic googling, I found that nobody has ever proven that people are born gay and that environment plays a great part in homosexuality. I wish to know if there is a genetic component to ...
4
votes
2answers
654 views

How is membrane capacitance related to the increased speed of saltatory conduction?

Here is the original question which inspired my question. As explained by the answers there, the reason saltatory conduction in myelinated neurons is faster than non-myelinated conduction is because ...
5
votes
2answers
28 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 ...
3
votes
1answer
20 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) ...
6
votes
1answer
182 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 ...
6
votes
1answer
38 views

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

This question came about from reading the comments of this (very unclear) question, which the author did not properly clarify. Vegans are often recommended to take vitamin B12 supplements, as the ...
2
votes
0answers
23 views

Do animals commit suicide? [duplicate]

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. ...
10
votes
1answer
1k 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 ...
6
votes
1answer
118 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?
2
votes
1answer
41 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 ...
1
vote
2answers
46 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?
4
votes
0answers
59 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 ...
0
votes
0answers
31 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?
1
vote
0answers
23 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?
1
vote
0answers
93 views

Were we able to create vitamin B12 in past?

All herbivores produce vitamin B12 de novo. Gorillas, for example, are "vegans" so I suppose some human ancestor was also herbivore. Have we ever been B12 self-producers? If so, why have we lost that ...
2
votes
0answers
13 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 ...
1
vote
0answers
15 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 ...
0
votes
1answer
52 views

Can you measure plasma glucose with a regular glucose meter?

I'm wondering if plasma glucose can be measured with a regular glucose meter and strips like this. I know these meters are normally used to measure whole blood glucose, but can they measure plasma ...
2
votes
0answers
24 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 ...
0
votes
1answer
19 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 ...
4
votes
0answers
20 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
2answers
87 views

Swapping genes?

So, gene therapy is to take out a gene, correct its mutation, and put the corrected one back into the organism, right? Is it also possible to take out a gene from an organism and put in a totally ...
0
votes
0answers
28 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
21 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 ...

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