0
votes
1answer
30 views

Normal cell diffusion in normal organism?

We know, that cancer cell can travel across an organism. Is this ABSOLUTELY impossible for NORMAL cells? For example, is it EXACTLY ZERO probability to find some bone cells inside liver or some skin ...
1
vote
2answers
57 views

Density of cells in human tissues?

Where can I find values, or estimates, of the density of cells in human tissues? Maybe an overall estimate, or distinct values for distinct tissues? Or maybe not human, but mammal tissues (which ...
0
votes
1answer
13 views

Identifiying a conserved residue in multiple PDB structures

I have a few hundred PDB structures of the same protein, and I need to identify a specific conserved residue in all of them. I wanted to extract the sequences from the PDB files with BioPython, align ...
4
votes
1answer
30 views

What determines the shape of the center-surround receptive fields of retinal ganglion cells?

The wikipedia article about receptive fields of visual system tells us the following: The receptive field is often identified as the region of the retina where the action of light alters the ...
1
vote
1answer
25 views

What kind of changes “stays” in the neuron after the nervous impulse happened?

I often see in neuroscience textbooks about how the brain controls everything in the body with different tracts and etc, and it seems that information is always being transmitted, like there's no ...
4
votes
1answer
53 views

What is the purpose of THC for a Cannabis plant?

Why does a Cannabis plant produce THC? This question is brought up drawing an analogy to nicotine in tobacco, where nicotine is developed by tobacco plants as a pesticide. Is THC a pesticide as well? ...
0
votes
1answer
30 views

Aspirin - does it inhibit enzyme of thromboxane?

This is a diagram a friend showed me about the drug aspirin, where we were arguing which enzyme it prevents. Aspirin is known to inhibit the production of prostaglandins. However, it also serves ...
4
votes
1answer
57 views

Why do children prefer sweeter foods?

As we get older, we tend to lose our sweet tooth and become more tolerant to bitter foods, like vegetables. However, I never understood how this works. Why is it that children prefer sweeter foods, ...
0
votes
0answers
13 views

Human walking biomechanics: is it pushing, pulling, or subjective?

The horses are divided in various species. Some are genetically better built for traction, others for speed. How about humans? How is our motion, traction like, pushing focused, mixed, or is ...
1
vote
1answer
31 views

How do you know which organisms are keystone species?

I know that keystone species are those that play a crucial role in an ecosystem, but since all species are interdependent upon each other and each occupy their own niche, aren't they all important? ...
0
votes
1answer
26 views

How does cytochrome c oxidase inhibition cause cell death?

I realise the inhibition of cytochrome c oxidase prevents the release of H+ ions into the intermembrane space, and that the ion gradient is required for ATP synthase action. However, I'm not sure how ...
0
votes
2answers
19 views

Can an enzyme be activated without allosteric inhibition or activation?

Are there ways by which an enzyme may be activated or inhibited by non substrate molecules other than allosteric activation or inhibition?
4
votes
1answer
57 views

What is a tardigrade “in tun form”?

While reading this article about tardigrades that had been previously frozen, I came across some verbiage I wasn't sure of and couldn't find any real explanation given the context. The article kept ...
1
vote
1answer
18 views

BWA-MEM single strand or doublestrand alignment

In whole genome secondary analysis does BWA-MEM use a double stranded fasta reference or are reads aligned to only one, single stranded fasta reference?
1
vote
0answers
13 views

What fills the spaces between non-fused sacral vertebrae?

What is in between the sacral vertebrae before they are fused? I have looked and found no specific descriptions. If it is simply cartilage, what type of cartilage?
3
votes
1answer
92 views

Why does Citric Acid occur in Citrus fruits?

Why is there so much citric acid in citrus fruits? And how did it evolve i.e. what did it come from? Is it a by-product of the ripening process? Why have citrus fruit evolved a particularly high ...
0
votes
1answer
23 views

“Heterozygotic expection” - when heterozygote differs from both homozygotes, but homozygotes are similar

For simple 2-alleles genetic model {a,A} and corresponding quantitative trait Q is typically true that Q(aa)>=Q(aA)>=Q(AA) or conversely Q(AA)>=Q(aA)>=Q(aA). For example, dominance means that ...
0
votes
0answers
18 views

Hair whitening with age explanation

I don't understand, why the hairs are whitening with age? Popular explanations look formal to me. For example, an explanation by stopping of melanin production is just a rephrase. Melanin is a ...
1
vote
0answers
16 views

How only one follicle develops into graffian follicle?

I've studied that one out of many follicle develops into mature or graffian follicle. The fact which confuses me is that, since all follicles are in same ovary, close to each other with equal supply ...
1
vote
1answer
34 views

Reason for aquatic plant roots

My question is about why aquatic plants have roots. At first they seem a bit superfluous to me because leaves of the plants could just absorb nutrients directly from the water thereby skipping a need ...
3
votes
1answer
54 views

HOw are AMP's “recharged” to become ATP's in a cell?

I understand that after the translation stage of ribosomal protein synthesis, tRNA molecules are floating in the cytoplasm without attached amino acids until they find the correct aminoacyl tRNA ...
0
votes
1answer
26 views

Will dissolved proteins pass through a 0.2 micron filter?

Given that there may be exceptions, can you usually expect protein to pass through?
4
votes
1answer
73 views

What causes the opaque green colour in Lepidoptera?

Link here to what I mean by 'opaque' colouration on the insect, the colour intensity remains constant despite changes in light intensity and angle (not shown by the picture but the moth exhibits this ...
1
vote
1answer
140 views

Examples of animals with 12-28 legs?

Many commonly known animals' limbs usually number between 0 and 10. For example, a non-exhaustive list: snakes have 0 Members of Bipedidae have 2 legs. Birds and humans have 2 legs (but 4 limbs) ...
1
vote
0answers
39 views

Making mistakes in the laboratory [closed]

I have just started an internship in a microbiology laboratory. I have had a rather small amount of laboratory experience before this so had to learn mostly everything from scratch. I have been there ...
0
votes
0answers
7 views

Where to Find Pedigree-Linkage Data for Computational Pedigree Analysis

I'm currently working on a project that uses graphical models (Bayesian networks) for pedigree analysis. My group developed a few models several months ago, but the original data used to develop the ...
0
votes
0answers
19 views

Determination of Ageing by ECG inclusions/exclusions?

I am studying ageing and considering ECG signal because of its high sensitivity in theory (escardio). Some factors Sensitivity Gender Medical treatment ... Benchmark: RTG dental + wrist ...
1
vote
1answer
23 views

Examples of seeking behavior by brainless animals

Are there any examples of brainless animals (e.g. jellyfish) exhibiting seeking behavior, such as following smell or light gradients towards food, or following hormones towards mates?
0
votes
1answer
33 views

How much do crocodiles eat`?

How much do crocodiles eat? The closest I found to an answer was on german wikipedia, where it says that adult nile crocodiles eat "only about 50 full meals a year." While interesting, without knowing ...
0
votes
0answers
12 views

examples of animals losing their brains when losing their mobility

I'm looking for examples of animals with central nervous systems that start out mobile, but then become permanently attached to something, and lose their brains. One famous example is that of some ...
2
votes
0answers
38 views

Does medication make the body dependent? [closed]

First of, I know of course that certain medication can cause an addiction if incorrectly used. But as far as I understand it, drugs prone to cause addiction have some agent in it, that makes them ...
3
votes
1answer
41 views

Why are sequencing reads shorter than PCR products?

I have desinged and tested primers for RT-PCR, then purified the PCR products from the gels and send them to sequence at GATC (SUPREMERUN) using the forward primers. After blasting the reads to ...
1
vote
0answers
13 views

Does this habit present any harm? [closed]

Sometimes I am able to put one knee down on the floor, rest my weight on that knee, and then relax it in order to make the knee cap go up and "crack" the knee. I can do this with both knees, I think ...
3
votes
0answers
29 views

Do ants use something similar to the honey bee “waggle dance” to instruct the rest of the colony where to find a food source?

In the 20 years since we built our home, we've just recently had our first ant infestation. I'm familiar with the fact that ants leave scent trails to find their way back and forth between the ...
2
votes
0answers
24 views

Are there fundamental differences between the adaptive immune systems of higher primates and other mammals?

I recently attended a Leukemia and Lymphoma Society lecture in which one of the lecturers indicated that there are fundamental differences between the adaptive immune systems of higher primates and ...
1
vote
0answers
42 views

Do animals demonstrate target practice (i.e., playful accuracy behavior)?

Do animals demonstrate any sort of accuracy-motivated play? (please provide examples!) Consider most human sports and related hobbies. Most share the common goal of hitting a target or being ...
1
vote
0answers
35 views

Why does heating kidney beans at a low temperature potentiate the toxicity of phytohaemagglutinin?

I recently found out that red kidney beans contain a relatively high amount of the toxic lectin, phytohaemagglutinin. An article on phytohaemagglutinin on the FDA website states: Several ...
1
vote
0answers
16 views

Panel 9 urine/ prescribed ADDERRALL XR [closed]

My doctor conducted a Genesight test, finding out that I am an ultra rapid metabolized. Often times, my body will metabolize my medications before they enter my system. Thus is why my prescriptions, ...
1
vote
0answers
19 views

Comparing genetics [closed]

Compare the possible effect on an individual of knowing that they have genes predisposing them to type-2 diabetes and the dominant allele that causes Huntington's disease. I am not sure about the way ...
1
vote
1answer
22 views

DNA Topology. Question on twists and writhes

Hi guys there is a question which has been driving me crazy ever since I saw this video(https://youtu.be/az2c6UbEdug). At 4:50 the guy says that when a right-handed circular DNA starts forming a right ...
2
votes
1answer
88 views

Why bacteria and viruses are so much smaller than animal cells?

Why are bacteria and viruses so much smaller than animal cells? - I don't have more information about the question, sorry if this is too vague.
0
votes
0answers
65 views

How do CAM plants keep stomata closed by day and open at night?

I understand how plants open stomata, with the H+ ion removal and the resulting K+ ion influx in the guard cells to induce turgor (wikipedia article here), though not how this process relates to ...
3
votes
0answers
26 views

Droppings of mystery: What are they

I have noticed the droppings below, quite visible on snow, next to an inner-town building situated next to this place in Luxembourg, central Europe. There are quite a few, but I have not noticed them ...
3
votes
1answer
34 views

Nicotine levels in non fruit/edible parts of plants (that are not tobacco)

I am an ex smoker who now vapes (uses e-cigs). Various authorities are equating vaping with smoking by calling it a 'tobacco product' - which is in a sense true given that the majority of nicotine ...
0
votes
2answers
37 views

Does a gene that regulates itself necessarily be a transcription factor?

I am not a biologist, so please pardon the overly noob question. Some genes are transcription factors (TF) and regulate other genes. My question is: if a gene is NOT a TF gene, can it regulate itself? ...
2
votes
1answer
84 views

How is HIV evolutionarily viable despite its extreme virulence?

How does HIV survive natural selection? And how has it managed to kill far more than any non-airborne virus in recorded history?
1
vote
2answers
33 views

Do antioxidants interfere with chemotherapy?

Since most of the chemotherapy drugs kill cancer cells by damaging their DNAs by means of free radicals. So antioxidants, which will detoxify free radicals, should theoretically decrease the efficacy ...
1
vote
0answers
16 views

Atlas from human brain structures to 3D coordinates?

I would like to visualize specific human brain structures in the three dimensional space and compute specific geometric properties of these brain structures (size, centroid, etc). Therefore, I am ...
1
vote
1answer
23 views

How to predict Protein-Protein Interactions from a pair of gene symbols?

I have a list of pairs of gene symbols who interact (putatively) and would like to assign each pair a score (and record other details) based on the predicted Protein-Protein Interaction (PPI). The ...
0
votes
0answers
6 views

Is there a joint on a brain connecting both inner speech and outer speech sensation?

I'm interested of the neurophysiology of the inner speech/inner voice aka. auditory thinking. This question is similar to: What are the common neural circuitries between visual sensation and the ...

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