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4 views

Using Diffusion Constant to calculate time taken to travel

Is there a way to use D , the diffusion constant to estimate the time taken to travel across a cell. E.g one of 100 micro metres. Or by the very random nature of brownian motion is this impossible?
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0answers
11 views

Question about MANY latino relatives on 23andMe

I took a DNA test on 23andMe, then I went to the meet relatives tab, there I find that I have MANY Latino relatives of about 0.25% DNA in common. I am about half Spanish (Iberian, full European). I am ...
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1answer
16 views

Can the word “Strain” be used to describe plants or is it used only for microorganisms?

I am trying to determine if I can use the word strain correctly as it is presented in the dictionary as "a variety of plant developed by breeding" or should strain be used only to refer to subtypes of ...
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2answers
299 views

What is this animal looking like an Axolotl?

My friend caught a strange looking animal and he's saying it is an axolotl. I keep telling him it's almost impossible, since they are almost extinct in their natural environment and he caught it in St-...
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1answer
30 views

What are these near microscopic white bugs from my comb?

I saw a whole bunch of white bugs crawling on my comb in the medicine cabinet, they didn't photograph well but I did manage to get a bunch of them in mineral oil and eventually take some micrographs. ...
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1answer
22 views

What is the difference between Molecular and Cellular tolerance?

Although I've read that there are three types of tolerance, molecular cellular and behavioural, I cannot seem to find any mechanism of cellular other than desensitization of receptors. If someone can ...
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1answer
24 views

Could Physarum polycephalum consume regular toenail fungus?

I just watched this video on physarum polycephalum, aka the "blob" and noticed how it consumes white fungus. Could it do the same maybe with human toenail fungus?
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0answers
12 views

Is the biomass decreasing?

Is the overall biomass decreasing over time, and if yes, has that trend started within the last say $200$ years (about when industrialization started)?
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0answers
14 views

How does wall pressure oppose osmotic pressure?

This question is based on the equation: Diffusion Pressure Deficit= Osmotic Pressure - Wall pressure I know that wall pressure is directed towards the protoplasm. I need to make sure if osmotic ...
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1answer
53 views

Could it be that the human genome contains the most non-coding structures of all species?

One can read here that human DNA contains about 6 megabases of information. That's less than the number of bases than a rice plant genome contains. See here. Though I don't know how many bases a plant ...
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0answers
25 views

Are all glutens the same in regard to immune (celiac) response?

Is it possible for a person to be sensitive to the gluten from one type of grain but not another? Celiac disease is understood to be an immune response to gluten; testing for celiac includes testing ...
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0answers
20 views

What bioagent is suitable for living in carbon dioxide?

This microbe is supposed to convert carbon dioxide into mellitic anhydride and oxygen and carbon monoxide. The synthesis chain and it's enzymes are under development. What could be a suitable microbe ...
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0answers
32 views

What is the probability that a gamete will only contain father's chromosomes

As it is depicted in most textbooks, cross-over does not occur between the two "outer" sister chromatids. By independent assortment during Meiosis I, there is 1/2^23 chance that all father's ...
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0answers
39 views

Hollow stalks in celery

When cutting a section of a celery plant stalk it appeared hollow inside, i.e. the cortex was hollow and encircled by the cambium, the vascular bundles, some cortex and the epidermis layer, thus the ...
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1answer
34 views

Do hormones have antigens

I would have to think that the answer is no because they are used as various drugs such as FSH in infertility treatments without the need of immunosupressants. I'm in high school at the moment so I ...
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1answer
70 views

Is molecular oxygen (O₂) consumed in any process (in humans) other than acting as an electron acceptor for the ETC?

I know that molecular oxygen (O2) serves as the electron acceptor in Complex IV of the electron transport chain, which maintains the proton gradient that produces ATP for, as far as I know, every cell ...
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0answers
33 views

Does the 'President' have 2 Billion Leaves?

The world's second-largest known tree, the President, in Sequoia National Park is 3200 years old and is said to have 2 billion leaves (Source: https://youtu.be/vNCH6uhB_Bs?t=59). Is this correct? And ...
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0answers
24 views

What can happen if a human takes SB-243213? [closed]

SB-243213 acts as a selective inverse agonist for the 5-HT2C receptor. The 5-HT2C receptor is one many 5-HT receptors which are receptors that bind serotonin, and seems to play a major role in both ...
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0answers
20 views

A fictional species relying on Mechanoreception to hunt prey? [closed]

I'm a writer currently developing a military sci-fi concept and could use help working through some theoretical creature designs. During early concepting, the actual specifics of the creature-threat ...
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0answers
33 views

If a plant root is under the influence of both gravity and a source of water which direction will it grow?

Which stimulus is the strongest? Which stimulus will have most effect? What I mean is if I take a plant and plant it in soil such that the soil has more water content and minerals in upper layers ....
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0answers
15 views

What type of bug is this

Found in apartment block in the two ground floor flats in Letchworth UK
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0answers
20 views

What happens when you add water and oil? [closed]

So oil molecules and water molecules cling to their respective molecules and tend not to combine. Even when water and oil are mixed, oil gets separated as droplets and floats on the water. This is due ...
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0answers
20 views

What do oxpeckers eat from thick-skinned hippopotamuses and rhinoceroses?

Noted for their thick skin are both rhinoceroses (1.5 to 5 cm) and hippopotamuses (6 cm). They are further noted for their symbiotic relationship with bird called an oxpecker: Both the English and ...
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1answer
50 views

How are proteins reused in the body?

Part of what we eat are proteins, and our body is in part build of proteins. Are the proteins of the body build based on proteins in food at all? Are proteins in food directly reused in the body, or ...
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1answer
22 views

Is the frequency at which a species mutate affected by natural selection? [duplicate]

As per natural selection, is it safe to assume that some species will have it genetically encoded so that they produce a certain 'perfect' rate of mutation so that they can adapt to an environment ...
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4answers
82 views

Why doesn't evolution converge on perfection?

I got to know about an organism called "Tardigrade(water bear)" which is an extremely hardy organism and can survive in most conditions. My question is that if the aim of life in general is to ...
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0answers
23 views

How can I propagate a community of anaerobic bacteria sampled from mud in a bog?

I'm doing research on anaerobic bacteria. In the fall I took mud samples from a bog and have been working with them but I didn't take enough. Now winter has rolled around (Im in Canada) and all the ...
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0answers
31 views

What will be the function of a cell if it contained large numbers of Golgi Bodies? [closed]

I was just doing my holiday homework and I found this question which confused me. I feel like the answer is in front of my eyes but I can't find it so I hope you guys can help
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0answers
12 views

Does electrical muscle stimulation helps to loose weight?

At the risk of being blocked, I ask my question anyway. In this Wikipedia article much is written about electrical muscle stimulation. I can imagine it helps with developing your stomach muscles. You ...
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1answer
54 views

Does the Human Eye White Balance?

OK, this may be a stupid question…but here goes. Does the human eye “white balance” itself? I assume that each human perceives colour slightly differently according to the peculiarities of their own ...
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1answer
41 views

Nitrogen deficiency and chloroplast function

Q. The formation of which of the following in the chloroplast is affected by a deficiency in nitrogen? (a) Glyceraldehyde 3-phosphate (b) Starch (c) Enzymes (d) Carbohydrates My thoughts: Nitrogen ...
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1answer
27 views

Identify this South African spider

A family member saw this spider in her garden in the Cape Town area of South Africa. It's very attractive and I wondered what species it was? Approx size is that it would fit roughly on a 3cm ...
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1answer
35 views

Ion-gated ion channels

Today I've heard for the first time of calcium-gated ion channels but find it hard to get an idea how they work, where they are located, and which role they play. I assume calcium-gated ion channels ...
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0answers
17 views

What difference in proteins radius of gyration can be considered significant?

In molecular dynamics simulations of proteins, the radius of gyration is often used to assess the compactness of a protein. When comparing two protein radius of gyration, what difference can be ...
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0answers
19 views

Differences between neurotransmitters and neuromodulators

According to the Wikipedia article on neuromodulation a neuromodulator can be conceptualized as a neurotransmitter that is not reabsorbed by the pre-synaptic neuron or broken down into a ...
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1answer
35 views

In vivo, does it take energy to move double bonds from cis to trans in long chain unsaturated fatty acids

In vivo, I understood that because all polyunsaturated fatty acids bonds are -cis they are crowded, kinking the molecule, and because of that, the oxidative enzymes cannot initially access them. They ...
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0answers
41 views

Is there any validity to this gif i found online (brain chemicals and emotional state)

https://media3.giphy.com/media/2wRLDz95iZ3YhSn9pK/giphy.gif?cid=790b7611daa0c5a1c0d20e61778d5f93d425fe1da3511044&rid=giphy.gif Im curious if this gif has any use at all when it comes to being ...
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0answers
33 views

Reference request on ecology

I would like to study the basics of ecology (especially biodiversity). My long-term goal is to learn about ecosystems in the Alps, but I guess I should start reading some textbook with a more general ...
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1answer
37 views

What are the constraints on an operon?

From what I understand, the term operon is loosely defined to be a collection of genes that are found to be in the same proximity in a genome. Some definitions enforce that an operon is only ...
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1answer
30 views

Could Cyanobacteria farms help dilute pollutants in the atmosphere

If I understand correctly, roughly ~2.8 billion years ago cyanobacteria started pumping large amounts of oxygen into the atmosphere. Using modern industrial processes could this be emulated by ...
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0answers
11 views

How are newly synthesised proteins targeted to the plasma membrane?

There does not seem to be a definitive answer to how proteins destined to be intrinsic plasma membrane proteins are directed there. Presumably, assuming starting at a cytosolic ribosome, the pathway ...
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0answers
22 views

How the cell changed to cancer cell?

Mutation in chromosome, can change the cell, it's take a long time, then it's become cancer cell, but how?
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0answers
38 views

Identify an animal (Japan, urban area)

I met this animal yesterday while walking along a small river in Yokohama, Japan. It came out of the bushes some 5 meters away from me, but while I was launching the camera app on my smartphone, it ...
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0answers
26 views

How does post-transcriptional editing work?

Since exons in vertebrate genomes are generally separated from each other by introns, and since indiscriminate translation would produce non-functional proteins, vertebrate genomes have mechanisms for ...
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0answers
15 views

What is the need of mucilagenous coating in pollen grains of aquatic plants?

I'm a high school student from India and here in our prescribed biology book(NCERT), it is written that pollen grains of aquatic plants have a mucilagenous coating to protect them from wetting. My ...
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0answers
17 views

About the mechanism of coupled reaction/metabolism with ATP

I am not in the field of biochemistry so this may be a rookie question or misconception. I heard occasionally about the energy "released" from ATP hydrolysis fueling (endergonic) biological reactions....
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1answer
58 views

Can it always be determined if an animal is a carnivore, omnivore, or herbivore by its teeth or are there exceptions?

Take the panda, for instance, it has canines but it's an herbivore. However, are there are other aspects of its teeth where one could still tell that it's an herbivore? Do the teeth always relay the ...
2
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1answer
52 views

How are the images of both eyes combined to form one image?

When you see an object by one eye, ex.right eye, you see it from the right direction and the opposite if you see it by your left eye, but when you open both eyes, the image appears somehow centric in ...
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1answer
30 views

What happens when a human ingests a large meal, and after a short time follows it up with a large amount of indigestible carbs?

A human eats a large meal and indigestible carbs (IC) with such a timing that the IC arrive to the small intestine when it is already full and busy breaking down and absorbing the meal. What would ...
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0answers
13 views

Typical firing patterns of neurons in the default mode network in resting state

Inspired by the Wikipedia article on the default mode network where I read: Hans Berger, the inventor of the electroencephalogram, was the first to propose the idea that the brain is constantly ...

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