0
votes
0answers
2 views

Why do the ants eat cockroaches' head first?

Sometimes I see in my house there are flipped cockroaches whose lose their heads. Only my cat and ants want to play/eat them, and I don't think my cat would like to pull their heads out. Do you have ...
0
votes
0answers
7 views

Can an organism process $H_2O$ into $H_2O_2$?

In an answer to a recent question on Worldbuilding, I suggested that an organism convert $H_2O$ into $H_2O_2$. I suggested a few processes that yielded the desired final result ($2H_2O \rightarrow ...
1
vote
1answer
12 views

Sensory adaptation regarding smell and hearing

Imagine the scenario. My friend and I are playing a game of chess near a highway. Initially, I notice the sound of the highway. While I'm playing chess, however, I do not notice it. After the game my ...
1
vote
2answers
25 views

Do “Giraffe Weevil” males build Nests

I had came across an insect near my backyard in India(Kerala). I haven't seen this one before and I searched web to find out what insect is this and found its image which saying its a "Giraffe ...
1
vote
1answer
45 views

Interpretation of graph from evolutionary biology

I am studying evolutionary biology, and been presented with this graph: I am having some difficulties understand its meaning. For a start, why is time measured as a fraction of the population size? ...
0
votes
0answers
7 views

How to download PPI in NCBI

I want to a protein protein interaction for analysis with R programming. output format : Excel or TxT or FASTA R package : No important, myself find. You tell me that how to download a PPI from ...
3
votes
1answer
20 views

What is 'independent assortment'?

What is the definition of 'independent assortment'. I tried researching this term but came back with two results: alleles assort themselves independently of different alleles the alignment of ...
3
votes
1answer
27 views

Why cytotoxic T cells don't kill dendritic cells when they present antigen?

When a cytotoxic T cell (CTL) recognizes a peptide presented in the MHC-1 of a dendritic cell (APC), why it doesn't kill this cell? I know that initially, in the lymph node, the T cell is ...
7
votes
1answer
88 views

Providing small molecules to cells on a filter plate

Lets imagine that I have mammalian cells that I've immobilized on a filter. Now I want to keep providing small molecules to these immobilized cells without resolubilizing the cells. The caveat is ...
0
votes
0answers
15 views

How brain hemorrhage occur?

I want to more about brain hemorrhage. Like a.) Why only some part of brain only gets affected by high blood pressure? Means more than one position bleeds are possible? b.) The artery gets burst or ...
1
vote
0answers
9 views

Is Zeiss Primo Start microscope worth the price for student use?

I study physics but I have got interested about biology too. Surfing around the web, I have found out that in buying microscopes one needs to decide between the cheaper no-name brands vs. the four big ...
6
votes
1answer
970 views

Does one parent transmit more DNA to the offspring than the other one?

Does one parent transmit more DNA to the offspring than the other one? Or do both parents always transmit the same amount of genetic material to their offspring? In other words, can a baby be ...
5
votes
1answer
60 views

Is it biologically possible for an adult's eye color to change?

Can it be that the adult eye can change color? Specifically my question is about a unilateral color change, such that the color of one eye remains constant, while the other changes color over time. ...
1
vote
0answers
22 views

plot the nucleosome distance to TSS [on hold]

I am new to bioinformatics and python,Now I have downloaded nucleosome-seq data and TSS-seq(which also names CAGE) data,so I try to draw a picture like this: ...
0
votes
0answers
9 views

Bacterial/microbial metabolism of sucrose in fruit juices

While taking out the recycling this morning, I noticed that my old orange juice carton seemed to be inflated. Opening the cap relieved a lot of pressure built up inside the carton. I'm thinking that ...
23
votes
4answers
4k views

Why don't mammals have more than 4 limbs?

Arthropods have 6 or more limbs and arthropods with 6 limbs appear to move faster than arthropods with 8 limbs so I wonder whether this might have something to do with fast and efficient locomotion. ...
0
votes
1answer
17 views

Among xerophyte plants, which one grow faster and consume water the least?

In an effort to select for the most suitable plants to possibly colonise desert and stop its expansion, what would be the xerophyte plants that grow the faster and expand on surface, while using the ...
3
votes
1answer
32 views

Any benefit to low dose radiation?

Is there any survival benefit in humans that can be obtained from chronic exposure to low dose radiation, or is any dose of radiation a potential harm? Has any research been done into this?
2
votes
1answer
55 views

What is the difference between rheobase and threshold?

Neuronal tissues can be excited by electrical stimulation. Two commonly encountered characteristics for electrically stimulating nerve cells is the threshold and the rheobase. My question is what the ...
6
votes
1answer
456 views

Why does A pair with T and G with C?

DNA is made up of pairs on AT and GC base pairs. I know that A only pairs with T and G only with C. Does this apply just to humans, or are there animals where T will pair with G? Also, surely there ...
2
votes
1answer
70 views

How common is complete heterochromia?

How common is complete heterochromia? (One iris is a different color from the other) Are there any statistics available for this? If no, why not?
1
vote
0answers
54 views

Solid phase use in HIV rapid tests

I have a question in regards to my HIV test research. The rapid tests like Orasures Oraquick contains a strip of synthetic peptides that are used to represent proteins found in the envelope region of ...
0
votes
1answer
26 views

Exact location of E. coli in human body

E. coli lives in lower intestine. But exactly where can we find E. coli, and where is there none (or a really small amount) of it? I need the exact names of parts of the lower intestine where we can ...
4
votes
1answer
74 views

Large scale reverse transcription?

I need to make RNA:DNA duplexes. I can make 100 to 200 ug of mRNA through in vitro transcription, and I know how to use reverse transcription to make a cDNA library, but I have questions with this. ...
3
votes
1answer
45 views

Statistics on energy consumption breakdown per biological functions across organisms?

Are there any statistics available on how much energy organisms use for each biological functions (i.e. something similar to the line of "Bacteria spend X% of energy on information processing, Y% for ...
3
votes
0answers
55 views

How does Natural Selection shape Genetic Variation?

Background Importance of the additive genetic variance As stated here, the fundamental theorem of Natural Selection (NS) by Fisher says: The rate of increase in the mean fitness of any organism ...
4
votes
2answers
71 views

Plotting metabolic networks?

I need to draw a map of the core metabolism of E.coli. Associated with each reaction in the map I have a number that indicates the flux through this reaction. I want the map to reflect these fluxes ...
0
votes
0answers
17 views

T-cells Question

T-cells are important for efficient vaccination since they have: A. T-cell receptor (TCR) B. CD4+ C. CD8+ D. Memory My gut is telling me it's A since the TCR would recognize the antigens but I ...
0
votes
0answers
10 views

Is Norepinephrine beta2 adrenomimetic?

I know that it has alpha1, alpha2 and beta1 effects. It has beta2 receptor where epinephrine can effect. However, to say that it is beta adrenomimetic, I am not sure. That is ligand binding beta2 ...
0
votes
0answers
6 views

Ephedrine or pseudoephedrine indirectly central alpha2 mimetic?

I started to think this problem by first thinking if the alpha2 mimetism is possible in either case. It seems to be indirectly in either one. Ephedrine seems to have more prominent effect in CNS. ...
0
votes
0answers
10 views

Substrate specificities of GPPS, FPPS and GGPPS (isoprenoid biosynthesis enzymes)

I have some questions related to isoprenoid synthesis enzymes. Does Geranylgeranyl pyrophosphate synthase (GGPPS) contribute in Geranyl-Pyrophosphate (GPP), Farnesyl pyrophosphate (FPP) and ...
0
votes
0answers
5 views

Can choline-receptor stimulatants block cholinesterase inhibition?

I am thinking what are the possible options of terminating suxamethonium i.e. succinylcholine activity. Succinylcholine is enzymatically hydrolyzed by plasma cholinesterase. Can choline-receptor ...
1
vote
1answer
34 views

Does pupil size affect image focus in persons with no lens?

If an individual has no lens like Claude Monet (who had them removed). They should be able to still focus the images they see in a well light area if they shrink their pupils to a very small size ...
-2
votes
0answers
27 views

Are there 23 pairs of chromosomes present in each cell, or in the entire human body? [on hold]

There are 23 pairs of chromosomes. Are these present in each cell, or are there just 23 pairs present in the entire human body?
4
votes
2answers
178 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 ...
1
vote
3answers
116 views

Why is it better to drink room temperature water instead of cold water? [on hold]

My teacher told me that drinking water that is room temperature is better for you then drinking cold water, but she did not tell me why that is. I want to know because I often drink cold water (with ...
2
votes
2answers
86 views

Like other animals, why humans don't have species & breeds?

Like other animals, why don't humans have species & breeds ? Even my pet dog is one type of breed, but we (humans) lack breeds & species? What is the main reason?
0
votes
0answers
8 views

Is there any way to make pymol find the closest distance between RESIDUES?

This seems like an obvious utility, but I can only make it find the closest distance between ATOMS, which makes a big mess on the screen.
0
votes
0answers
12 views

Is one metabolomic database more searchable than any other? [on hold]

What makes one metabolomic databases eg. HMDB more search worthy than any other? Is it possible to have a general criteria since there is not one search reason? Is there any that have more user ...
0
votes
0answers
9 views

Milder hyperlipidemia in hypercholesterolemia? [on hold]

My professor suggested that in polygenic hypercholesterolemia, the overall lipid level does not increase so much as in LDL receptor defect patients. She also mentioned something about the dilution ...
-7
votes
0answers
34 views

Why can we see so many different types of mushrooms if we assume that they arrived to Earth on a comet? [on hold]

Why can we see so many different types of mushrooms if we assume that they arrived to Earth on a comet? I mean they don't have to have bright colors to attract bees or birds for their reproduction. ...
-1
votes
2answers
28 views

Bird identification [on hold]

I got a statuette of a bird, carved of semi-precious minerals, but with its tail broken off. I'd like to restore it, rebuild the tail, but I'd first need to know how it should look like. Can you help ...
0
votes
0answers
5 views

How much mmol/L of glucose does my dog extract from his meal into his blood?(at least roughly) [on hold]

In the context of insulin dependent diabetes(assume there is no glucose suppression in the blood at all, not even from the kidneys). I can find out the content of carbohydrate, but, I don't know what ...
2
votes
1answer
25 views

Is there any way the food industry can benefit from biofilms?

I realize all of the disadvantages, but I am wondering if the food industry can actually benefit from the formation of biofilms.
1
vote
1answer
71 views

What are some readily available, easy to test, bacteria?

I want to do a science fair experiment about how bacteria interact with 5-carbon vs. 6-carbon sugars, and I want a bacteria that is easy to test and is readily available. Any ideas?
14
votes
4answers
1k views

Could we transmit smells electronically?

We can encode sound and images in radio waves and send them, but presumably there's some physiological reason that we can't easily make a picture or video of a smell. Could we realistically break ...
4
votes
1answer
43 views

Is there an association between environmental and mutational robustness?

The robustness of a genotype is the ability of this genotype to resist (always produce the same phenotype) to various parameters such as mutations and environment. The ability of a genotype to resist ...
2
votes
0answers
24 views

ECG of heart transplant patients

I am studying ECGs of heart transplant patients. The difficult thing is that there is so little available data publicly. I must apply for data in my universities. It would be also great if ...
0
votes
2answers
38 views

Counting the number of hydrogen bonds of multiple PDB files

I've been trying to figure out a systematic way to count the number of hydrogen bonds for multiple PDB files. DSSP shows me the total number of hydrogen bonds when I make ...
2
votes
1answer
15 views

Action of Ebola Viruses

This video suggests that the first cell to be the victim of viral infection of ebola is the dendritic cell which acts as the leader of immune system cells.But I am unable to understand how the ...

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