0
votes
0answers
19 views

Most potentially “dangerous” land snake [closed]

What would be the most dangerous snake - if you take into account the potency of their venom and also the volume, but ignoring their aggressiveness - how many people could it potentially kill before ...
18
votes
2answers
3k views

How can birds disperse seeds when they are able to digest them?

I've just read in a book that birds' guts can digest almost all the consumed seeds with the exception of mistletoe and loranthus (which stays stuck on the branches). On the other hand, I know that the ...
2
votes
1answer
47 views

What contribute to the variation of protein sequence across different species and how do they influence?

What contribute to the variation of protein sequence across different species (e.g. phenotype, environment, evolutionary pressure) and how do those factors contribute to the variation? I have tried ...
0
votes
1answer
31 views

Find the concentration of free receptors in a solution of 90% free ligand and 10% receptor-ligand complex, knowing only the value of kD

I could use some guidance on how to utilise the equation for the disassociation constant kD to find the concentration of free receptors [R] in a solution containing 90% free ligand [L], and 10% bound ...
0
votes
1answer
30 views

Why does meiotic recombination disrupt the independent assortment of genes on the same chromosome?

There are many sources that say that genes that are "linked" by being on the same chromosome assort with each other -- that when an allele is passed on that the gamete containing said allele will also ...
4
votes
1answer
59 views

What's the name of this bug?

A friend of mine found this bug in Germany. He sent the picture and asked if anyone knew what kind of bug it is. Since no one knew and I didn't find anything similar via google search, I decided to ...
1
vote
1answer
167 views

sodium chloride and amylase activity

So, I did an experiment on the effect of sodium chloride on amylase. and I found out the higher the concentration, the slower the activity. Therefore, is it valid to make the assumption that when we ...
0
votes
0answers
9 views

How were CDK1 and cyclin B identified?

I know that MPK is a dimer containing cyclin B and cdk1 and this promotes entry into mitosis. The experiment I have found was that when MPFs were micro-injected into frog oocytes arrested in G2, the ...
1
vote
0answers
18 views

Extraction of arthropod embedded in animal tissue

I'd like to extract an ectoparasite from a biopsy of animal skin for subsequent identification. The mite is small, about 100 um, and embedded in a column of tissue. It's too small to manually excise ...
8
votes
1answer
168 views

Dogs bark at familiar person in Santa costume. Why? Don't dogs trust smell over vision?

Last night 10 humans and 2 dogs spent Christmas together. At some point, one human dissappears for a few minutes and comes back wearing a full Santa outfit. Upon respawning, the dogs start barking ...
9
votes
3answers
502 views

What happens if a non-diabetic receives an injection of insulin?

If a person without diabetes or any diabetes-related issues receives an injection of insulin, what happens? Would the blood glucose level drop or does the body naturally compensate for the added ...
10
votes
2answers
1k views

Why do Hot/Cold drinks taste sweeter once returning to room temperature?

Now, I know this is a very bizarre question, and I tried to find a correct exchange for this, but it might relate to biology/science as it being our taste buds and everything. I am so sorry if there ...
8
votes
2answers
5k views

Why is it beneficial for trees to grow that tall?

Why is it beneficial for trees to grow that tall? This sounds like a kid's question Mom, Dad... why are trees so tall? Costs and Benefits There are some obvious ...
3
votes
1answer
43 views

What does “generalisation” mean?

I am trying to understand a paper about ethanol: "Generalisation of ethanol with drug mixtures containing a positive modulator of the GABAA receptor and an NMDA antagonist" (Stolerman & Olufsen, ...
2
votes
1answer
54 views

How does an excessive amount of beta carotene affect skin colour?

How much is the daily need of beta carotene and how many carrots have to be eaten in order for one's skin to turn "orange". I found 2-4 mg/ day as basic need, 30 mg daily over three weeks turns white ...
0
votes
1answer
25 views

Distance to source populations and/or environmental gradients?

How do you disentangle the effects of distance to source populations and environmental gradients when the environmental gradient occurs in the same direction as the source population? For example, ...
2
votes
2answers
191 views

Coalescence time: Is it different for haploids and diploids in population genetics?

I'm trying to model Cyanobacteria cells divergence in 2 populations with mutation rate $-\mu$ and I need to verify my model with a valid theory. I don't have much biology background and all the ...
1
vote
0answers
7 views

Can HPV be infectious after it's been exposed to environment?

From what I know, HPV virus cannot be cultured I don't think it's possible to say if a sample has the potential to infect or not but what does it mean when they say HPV virus particles could persist ...
4
votes
2answers
90 views

Why don't antibodies generally bind to food and drugs?

Are these excluded thru central tolerance? What if you ingested something with a unique molecular structure that you hadn't ingested before?
7
votes
1answer
500 views

Extracting cell-free DNA

Has anybody had any success in extracting cell free DNA from plasma without using expensive kits? I've already spent a lot of my own blood trying to use standard phenol/chloroform methods with very ...
-1
votes
0answers
30 views

how to extract many protein sequences simultaneously? [closed]

I want to extract all protein sequences related to human breast cancer. Is it possible to download all simultaneously with high accuracy ? I would like the sequences to be the metastatic breast ...
4
votes
1answer
88 views

Synthesis of Fatty Acids Longer than 16 Carbons

I understand that the human body when performing Fatty Acid Synthesis can synthesize only until C16 (palmitate). However the ER has desaturases and elongases. I know that desaturases are used to add ...
0
votes
0answers
19 views

Is it dangerous for a child to have 8 primary teeth pulled by a dentist is one visitation? [closed]

If a child of 6-10 years old were to visit a dentist, What would be a dangerous amount of teeth to be pulled in one visitation? Say 1 tooth was decaying and chipped and the other teeth were primary.
0
votes
0answers
11 views

What happens to the ink of a tattoo over time? [duplicate]

Tattoos are commonplace all over the world, but a simple yet key question is what happen to the ink injected in the derma over time. Is it digested by macrophages or simply encapsulated by ...
0
votes
0answers
19 views

off-target score: same scale as guide sequence score?

I have a basic question that I have not been able to find the answer for. I am designing sgRNAs with http://crispr.mit.edu/ The interpretation of scores for guide sequence goes easy (optimal is 100%, ...
1
vote
0answers
24 views

My BRIG run is suspiciously quick. What is a typical length of time for a run?

I use the BRIG (BLAST Ring Image Generator) program to compare prokaryote genomes. It executes a local BLAST+ and visualizes the results as rings around the reference genome. I downloaded three ...
1
vote
0answers
11 views

Is the “freeze response” really a remain of our reptilian past?

I'm looking for any reliable sources relating the common-known human reaction on a stressful situation, humans sometimes freeze and can not move. From some materials found on the internet I got that ...
3
votes
1answer
49 views

Is there selection against long proteins and long genes?

Background thought Titin and TTN Titin is the largest protein in the human genome with 33423 amino acids. Titin is coded by the gene TTN that must be at least $3 \cdot 33423 \approx 100kb$ long. ...
-1
votes
1answer
23 views

What is the biological relationship between flowers and blossom? [on hold]

According to Wikipedia, the earliest fossil records of flowers date to around 130 million years ago. But I can't find anything about blossoms in particular. Is there an evolutionary relationship ...
3
votes
1answer
56 views

Do all different types of neurons serve different roles?

I know from my basic education in neurology that the brain has various sorts of neurons. These are usually bunched into 3 different categories (sensory, moto and interneurons). I read in a recently ...
2
votes
1answer
60 views

what are the best books for the IIT-JAM biological sciences exam?

I'm from India and i'm preparing for a competitive exam called the Joint Admissions Test for a Masters admission. I need help in finding books to read from for these chapters: General Biology: ...
1
vote
1answer
51 views

autosomal recessive population numbers

This question is background research for a science fiction / fantasy novel, my knowledge of genetic is very basic. It seems obvious to me that for genetic disorders that are autosomal recessive, if ...
0
votes
0answers
10 views

how to explain the results from conditional analysis [closed]

Some SNPs are not significant in the original GWAS associated data. I hope to find the causal SNP and the independent SNPs by running conditional analysis( top SNP as the covariance,regression ...
8
votes
1answer
160 views

Up to date, extensive documentary about dinosaurs?

I just finished reading the Wikipedia page about dinosaurs, and I very much enjoyed it. I knew that much of what I learned in the 80's as a child is (and was) incorrect, and now that I am a parent, I ...
0
votes
2answers
35 views

Simple computational biology project for AP Biology class. Ideas? [closed]

Our teacher assigned us a project to do with an extremely open-ended prompt and it should be completed within a month. I was planning on doing something related to computation and evolution in terms ...
9
votes
2answers
35k views

Blood Pressure: Significance of difference between systolic and diastolic

I wanted to understand what is the difference between systolic and diastolic readings of blood pressure. I understand 120-80 to about 100-60 is considered normal but does the difference in the two ...
6
votes
1answer
92 views

Can microdialysis be made in Drosophila melanogaster?

I've asked this before in stack overflow's cognitive science community, and someone recommended me to ask here: I've found a couple of studies using microdialysis on insects, but didn't found any in ...
1
vote
0answers
32 views

Why are treatment periods with antibiotics longer than 1-2 days?

Antibiotics are given prophylactically for several indications (e.g. prior to dental surgery). Why are the treatment periods for prophylactic antibiotics much shorter than when treating an ...
0
votes
0answers
34 views

How is DNA digested by the human body? [on hold]

Suppose I (a human being) eat some food? How would my stomach break down and digest the DNA in the food? I believe ultimately it should break down into and be passed out as uric acid but I'm not sure ...
0
votes
0answers
15 views

How effective will the synthesized virus be without epigenetic marks?

Will a de-novo synthesize infectious virus be as effective as the natural one? How important are epigenetic marks for the virus and is there a mechanism to restore them?
0
votes
1answer
16 views

When do 3 germ layers form in embryo? And why is there only one mature egg formed?

During the process of pregnancy, when do the 3 germ layers form in embryo? Is it after formation of gastrula? Also, during oogenesis, why does only one mature egg form? Why don't use polar body egg ...
3
votes
1answer
37 views

Is it possible to make a contagious cure to a virus?

In a TV series Ive been watching The Last Ship, - spoiler alert - a scientist develops a cure for himself for a virus, but actually continues to remain a carrier, and sort of weaponizes the virus ...
5
votes
2answers
135 views

What signal processors comprise an Event-Related Potential system for EEG?

So my 30,000 ft. understanding of the EEG signal processing data flow is: Capture raw EEG data ("raw waveforms") Run these raw waveforms through a Signal Processing Framework that consists of 1+ ...
0
votes
0answers
28 views

What were the camels' bumps good for back in the polar areas?

I've heard that camels lived in the North America formerly and just in the last few thousands years they've migrated to the hot deserts. Thus they allegedly utilized the adaptations against the cold ...
0
votes
0answers
11 views

Is there any study on odour remanence in human olfactory system?

does anyone here knows about at least one scientific study about how odours could impact human olfactory system and create some phenomenon that could be loosely compared to retina remanence? As an ...
1
vote
0answers
13 views

mVenus fluorecent protein, life time? luminosity?

If fluorescence proteins get excited by radiation, how long does it usually take for the excitation to decay (at room temperature)? I guess, if the life time is too long, the luminosity will be very ...
1
vote
0answers
33 views

Proteins in water vs proteins in crystal

I am not very familiar with the experimental procedure of x-ray crystallography except that it involves the very delicate matter of producing crystal that contain proteins and then diffracting rays ...
-1
votes
0answers
22 views

Is there a blood-test for ddt ? [closed]

a little background information, we got a second opinionn and the doctor said there is ddt in your body which is causing the symptoms. is there a blood test to verify this ?
2
votes
3answers
121 views

Does the biosphere have infinite resources and are they infinitely renewable?

Does biomass represent all of the resources of the biosphere and therefore it would be theoretically infinitely renewable (as long as we have the sun) since all the biomass is part of the carbon ...

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