All Questions

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0answers
4 views

Why does yellow appear the brightest colour to humans when that is not the wavelength at which our eyes absorb most light?

The rods in our eyes absorb most light at around 498 nm, which is towards the cyan side of green. We have three types of cones, maximally sensitive to wavelengths of around 430 nm (blue), 535 nm (...
0
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0answers
3 views

How is minute ventilation any different than ventilation rate?

The equation used to calculate both of these is the same: Tidal Volume * Breathing rate/Frequency of breathing. Then how are they any different ?
1
vote
1answer
16 views

At What Rate Do Ions Leak Out of a Plasma Membrane Segment That Has No Ion Channels?

In reading about the purpose of myelin during action potential propagation, I came across a point of confusion. From what I understand, one of the primary "benefits" of myelin is that it aids in ...
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0answers
13 views

Why does my face feel numb after eating an apple? [on hold]

Whenever I eat an apple (I don't know if only certain sorts cause this, unfortunately), my upper cheeks first feel flushed and warm, as though there is more blood flowing towards that part. Then, ...
0
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0answers
8 views

What is the smallest known viviparus

I want to know what is the smallest viviparus known at this time. I was Googling, but I can discover this animal. Thanks.
0
votes
1answer
12 views

Tree identification - Sicily

I am trying to identify the trees in this image, taken in Siracusa, Sicily. This would be very helpful for my thesis project I am working on at university, so thanks for any help. Robert
0
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0answers
7 views

Facial hair that turns black [on hold]

My hair on my face is fully gray, but recently I have been getting random black hair growing and they get infected
0
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0answers
16 views

Left or Right hand fingerprints relation between people

I am making a machine learning program for a project at school, where I would like to classify fingerprints (well depending on your answer I will have to change it) depending on wether its of a left ...
6
votes
1answer
121 views

Where can I find a diagram of cortex connections?

Has anyone come across a diagram (2D, 3D, maybe even interactive) of the connectiontions between cortex regions? Especially, the diagram should display the strength and direction of those connections (...
2
votes
2answers
81 views

Is DNA actually like source code repository?

So after reading articles like "People Use Just 8.2% of Their DNA" etc., and thinking a bit... I got this idea: What if DNA is actually like a software source code repository? You know, it has "...
0
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0answers
15 views

How much can homologous organs vary?

I've got a very layman understanding of the difference between homology and analogy. It seems clear that analogous organs have pretty much the same function by definition, while homologous organs have ...
0
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0answers
11 views

Latest estimates for shortest and longest wavelengths of light visible by dogs?

Dogs (canis lupus familiaris) are dichromats, meaning that their eyes contain two types of cone, responding maximally to two different wavelengths of light, namely blue (429 nanometres) and yellowish ...
-1
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0answers
14 views

How could “evolution on a petri dish” be applied to production of pharmaceuticals?

Theres a popular video (https://youtu.be/plVk4NVIUh8) where a culture of bacteria is placed on a petri dish with gradually increasing concentration of antibiotic resulting in evolution of super-...
2
votes
1answer
145 views

Help in identifying an unknown Golden Worm/Larvae

Can anyone help me to recognize this type of species? Is it a clustered worms or clustered larvae? Location is in Bali, Indonesia. Recently this species is goes viral, but people here always link this ...
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0answers
17 views

White hair turning back to original color

At 88 years of age and with white hair, my hair has started growing back to brown about
0
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0answers
14 views

Count number of splitted groups within a phylogeny

I wondered if it whas possible within a newick tree to count the number of monophyletic groups even if intruders are splitting this group. Here is an exemple Let say you have the following three : <...
1
vote
0answers
19 views

Why are Mules/Donkeys aggressive when faced with predators but horses are not?

I came upon an interesting quote after going down the rabbit hole on a variety of subjects. While deep in the data, I came upon this quote oat and farm animal owners likes to have mules with their ...
0
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0answers
17 views

Are there any ways to increase total body skeletal mass? [on hold]

I want my whole skeletal system to gain 5-10+ lbs. or so and look thicker, including the facial bones. Does HGH/IGF-1/etc. increase total body bone mass/volume/etc.? I have read some studies but can'...
-1
votes
0answers
15 views

Pronation of forearm

According to the figure below, the ulna and the radius are rotated together during the pronation of forearm. However, to my knowledge, the proximal radio-ulnar joint at the elbow is a hinge joint. How ...
5
votes
4answers
5k views

Why are H+ ions pumped out instead of in during cellular respiration

During cellular respiration in both mitochondria and aerobic prokaryotes, the Electron Transport Chain pumps H+ ions out of the matrix or cytoplasm to create a H+ concentration gradient. This forces ...
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0answers
17 views

Do tarantulas and humans have the same mechanism for growing hair?

There's hair on my arms. Tarantulas also have hair on their arms. Is this the same type of hair?
1
vote
1answer
89 views

Exact terminology of natural selection

You don't need to explain to me what the theory of evolution is, or how it works. This question is purely about what exact meaning the word "natural selection" is ascribed to. There seem to be ...
0
votes
1answer
16 views

Human Stem Cells and Disease

Can human stem cells be stored for use by future family members as a way to combat generational diseases like diabetes
5
votes
2answers
109 views

When endothelial cells in blood vessels (arteries or veins) are damaged, does atheroma form first or blood clot?

I have learnt from Khan Academy's video on atheresclerosis that when the endothelial cells of an artery are damaged, atheroma forms at the site, and if the atheroma’s fibrous cap is ruptured, ...
13
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2answers
2k views

What is the smallest molecule that can present as an antigen to the immune system in the context of allergies?

People often claim, in a colloquial sense, that they are "allergic to everything". Is it possible to have a full-fledged IgE mediated allergic response to very small molecules? I was always under ...
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0answers
13 views

Why do I feel suffocated when someone bends my fingers while sleeping? [on hold]

Yesterday, while sleeping my elder brother bent my fingers a little in backward direction and I felt difficult to breathe. Does anyone know why it happened?
0
votes
1answer
16 views

What sauropod genera had a double row of chevron bones in the tail?

I know that Diplodocus is marked by the feature of having a double row of or "double-beamed" chevron bones in the tail, but how diagnostic is this feature if several other sauropods have it? I mean, ...
1
vote
2answers
2k views

How does the counter-current multiplier work in the nephrons?

Why is the counter-current multiplier called like that? What is flowing in the opposite direction to the glomerular filtrate for it to be called "counter-current"? Can you please explain the counter-...
6
votes
2answers
182 views

What do memory cells actually do?

So I know that memory cells "remember" the most efficient way to kill a pathogen should it show up again... but what is the mechanism by which memory cells become activated by the second contact with ...
4
votes
2answers
2k views

Are these cats calico?

Calico cats are cats that have 3 fur colors and are always female or males two X chromosomes. I've seen many cats that will have 2 fur colors (one of them is usually white) and another, third, color ...
2
votes
2answers
135 views

Insect ID Montreal, Qc Canada

I found this bug in my kitchen, in front of my oven. It has wings and moves quite slowly on the ground. I can provide additional pictures if required. Can somebody tell me what it is? I have found ...
4
votes
2answers
91 views

Do these large spiders in Taiwan belong to different species?

I see both of these spiders (and others) frequently on hiking trips outside of Taipei. Their large webs are often high overhead between trees but can be right across a hiking trail that hasn't been ...
7
votes
1answer
176 views

Why did they expect Astronaut Scott Kelley's telomere shortening to accelerate? (they got longer!)

The NPR News article and podcast Scientists Share Results From NASA's Twins Study says: SCOTT KELLY (NASA Astronaut): You know, the symptomatic stuff is fine. I don't have any long-term negative ...
0
votes
1answer
55 views

What is “beto carotene” and how can it turn lakes pink?

The BBC News article Pink lake in Australia attracts and delights tourists describes an artificial salt lake in Westgate Park, Melbourne, Australia that tuns pink around February and then in "late ...
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0answers
15 views

Where do the oxygen bound in glucose vs the atmospheric oxygen go in cellular respiration?

I know that water is produced during glycolysis and oxidative phosphorylation and that carbon dioxide is produced during pyruvate oxidation and the Kreb Cycle. However, I'm not sure where the oxygen ...
1
vote
1answer
28 views

Does turbidometeric method count cell number or cell mass?

Here it says that scattering is inversely proportional to cell number but also says that we can observe greater absorbance as cell number increases. So does turbidometeric method work on cell mass ...
1
vote
0answers
13 views

What can eating pink mold do to a healthy person (someone whose immune system is not weakened)? [on hold]

I've tried searching it up, but my research has yielded nothing very specific. This morning, I was eating a muffin. I noticed that there was a patch of bright reddish pink dough. I wasn't thinking ...
1
vote
1answer
33 views

too low extention time for Taq polymerase PCR

I am currently working on my masters degree and have recieved the following question: "you want to amplify by PCR a gene 1kb long. The Taq Polymerase you have in the lab is able to synthesize 1kb/...
0
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1answer
13 views
0
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0answers
20 views

What would happen if all of my skin suddenly disappeared? [on hold]

If all of the skin on my body suddenly disappeared, what would happen? By skin, I mean the epidermis, dermis, and hypodermis. What would fall out? What would happen to the deeper tissues? And ...
0
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0answers
6 views

Can disorders involving involuntary muscle twitches and spasms have a hypertrophic and increased residual muscle tension effect?

Meaning disorders specifically like myokymia, myoclonus (positive and negative) and fasciculations. From the section of the literature I've seen, sometimes passing mentions are made when the disorder ...
31
votes
4answers
6k views

How do trees manage to grow equally in all directions?

I was walking down a road with these beautifully huge trees when this question occurred to me. Large trees with many thick branches have to grow equally in all directions, or they would tip over. Is ...
-1
votes
1answer
24 views

Do violet potatoes contain more or less solanine than normal potatoes?

What is the solanine content of the violet potatoes? Is it more or less than in the normal potatoes?
4
votes
1answer
41 views

Backbone hydrogen bonds between adjacent amino acids in a protein?

Is it possible for two adjacent amino acids in a peptide to form hydrogen bonds between the backbone NH and CO? Are there any examples of such situations in proteins and how common are they? If ...
0
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0answers
44 views

Why does it seem like there is very little disparity between races in regards to intelligence

There is numerous biological difference between human races, from height to average BMI to various organ size. Oddly however there is very little disparity in regards to intelligence (when accounting ...
0
votes
1answer
19 views

Selective breeding fluorescent sheep - possible?

I got into a small argument :-) Friends of mine try to draw fat line between "natural" selective breeding and applying molecular biology (CRISPR/Cas9) to put new traits in existing species. The line ...
2
votes
0answers
32 views

Where does mycelium growing in wood get oxygen?

As per title, where does mycelium, growing in wood, get its oxygen? I mean when the mycelium is spreading into wood, say an old log, beneath the surface. As an example, say I put mushroom dowels into ...
1
vote
0answers
9 views

Does pain decrease when the cell's communication is amplified or cleared?

It's hard to form this question because the company doesn't really explain how their product works exactly! I'm not sure if the skeptic's site would be a better place but I'm starting in biology first....
1
vote
1answer
17 views

Would intravenous insulin + glucose significantly accelerate glycogen synthesis?

Would an intravenous injection of insulin + glucose result in significantly quicker replenishment of exhausted glycogen stores than an injection of glucose alone? This is a strictly theoretical ...
4
votes
1answer
64 views

Species-ID: What is this thing attached to my wall (California, USA)

I found this thing attached to my wall next to my garden. I live in Simi Valley, California, USA. At first I thought it was a caterpillar and I left it alone, but after 2 or 3 months I don’t think it ...

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