0
votes
1answer
182 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 ...
6
votes
2answers
99 views

Can an organism process H₂O into H₂O₂?

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
39 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
0answers
59 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 ...
1
vote
2answers
105 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 ...
7
votes
1answer
2k 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 ...
6
votes
1answer
1k 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. ...
0
votes
2answers
32 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
1answer
35 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 ...
0
votes
1answer
24 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. ...
1
vote
1answer
33 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 ...
7
votes
1answer
899 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 ...
0
votes
1answer
44 views

How can succinylcholine cause myorelaxation?

I first thought that this is because of prolonged depolarisations. However, I am not sure anymore, because after reading PubChem, the only possible pathways are are Choline agonist. So I would say ...
1
vote
2answers
65 views

Bird identification [closed]

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
8 views

Function of Vermiform Appendix [duplicate]

Why is the Vermiform Appendix(a finger-like projection at the end of caecum of large intestine) called a vestigial organ even though it acts like a lymphoid organ?
3
votes
1answer
34 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 ...
0
votes
0answers
41 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 ...
1
vote
0answers
32 views

How to compare a camera and an eye

How could I compare what a normal eye can see to a camera lens? I just went through a very comprehensive article @ CambridgeInColor, but I'm still not really clear. When I take a picture with a SLR ...
1
vote
1answer
83 views

Ants eating bark [closed]

Was out walking in the park today, came across a tree, and me being me I thought "Hey lets try climbing this thing for fun." But something strange struck me, the tree was completely devoid, as in ...
3
votes
1answer
43 views

Looking for a gene in my raw genetic data. What are the possible causes for this?

Obviously, I barely know what I am talking about. But I want to find the "MUC5B promoter polymorphism rs35705950" in my RAW genetic data from 23andMe. (see this ...
2
votes
0answers
46 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 ...
3
votes
1answer
149 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 ...
1
vote
1answer
42 views

Why is heart failure treated as more critical than kidney failure?

The heart pumps the blood to supply tissues and kidney always filters the blood to remove urea,extra water and etc. And all these are vital,so the kidney is as important as heart: and my question is: ...
3
votes
1answer
379 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?
1
vote
1answer
36 views

Are bees positively phototropic

One day I had found some bees have come around the light source like other positively photo tropic insects, I hadn't seen any bees coming over light before. I think bees are diurnal and they don't ...
3
votes
2answers
50 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?
0
votes
2answers
63 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 ...
0
votes
0answers
25 views

Quetiapine tolerance

I've researched quetiapine for quite some time now and I've found some references to tolerance, but nothing conclusive. My question is whether quetiapine use builds tolerance to the drug and if so, ...
0
votes
0answers
24 views

What's the max speed that humans could run? [duplicate]

Assuming humans could use all of their muscle strength at once, with no need of cooling or energy, how fast could we theoretically run?
0
votes
1answer
50 views

Why we do not use RNAi to control ebola?

As you know using RNAi we are able to prevent gene expression. so why we do not use it to stop viral genes expression?
1
vote
1answer
32 views

Testing monophyly from per site log-likelihoods without optimising branch lengths

How can I obtain per site log-likelihoods for a topology against an alignment without optimising branch lengths? (which software can I use to do this) Per site log-likelihoods can be used for various ...
2
votes
1answer
143 views

Why do people and animals stretch out their bodies and what is causing this behaviour?

I noticed that my cat which is only 6 months old has started stretching its body from time to time. Then I thought that this motion doesn't seem very natural from another cat's viewpoint, so my cat ...
1
vote
1answer
105 views

Does methanol fixation deform cultured cells?

I use methanol fixation (@ -20⁰C for 10 minutes) when performing immunofluorescence assays on cultured cells. Generally speaking, this results in very good antibody staining. However, the cells tend ...
7
votes
1answer
80 views

What are parental antagonism & parental conflict?

I've been reading the chapter by Haig et al in The Genetics and Biology of Sexual Conflict. I think this chapter has them quite unclearly defined. Could anyone describe these two phenomenon more ...
1
vote
1answer
77 views

Why do humans have irregular teeth and impacting wisdom teeth?

Imagine that horses, dogs, bears, and gorillas had teeth as unreliable as humans do, The interruption in behaviour and stress brought by teeth would cause them to be more prone to sinus infections, ...
2
votes
0answers
58 views

Time for rigor mortis to set in [closed]

Rigor mortis sets in due to non-functional "ATP powered calcium pumps" as a result of which the calcium ions stream out & the muscles remain in a suspended animation state. But, it's a frequent ...
2
votes
1answer
127 views

Is excessive hydration a risk factor for cancer in humans?

I was reading a book on radiation biology, and the book describes the process of "indirect action", where radiation can first ionize a water molecule forming a free radical, which then may interact ...
2
votes
1answer
133 views

Alternatives to commercially available flow cytometric analysis software for use in cell cycle analysis?

I know that many labs use either FlowJo or FCS Express to plot and analyze their flow data. These seem like the two standards for most labs (and I have used FlowJo before). However, my current funding ...
2
votes
1answer
421 views

What is possibly wrong in my gel electrophoresis when I didn't see bands of DNA ladder on gel? [closed]

What was possibly wrong in my gel electrophoresis when I didn't see bands of DNA ladder, and genomic DNA sample on gel ? I could see bands of genomic PCR and RNA solution. Edit Thank you all of guys ...
1
vote
1answer
68 views

What are some difficulties animals had to overcome to reproduce on land?

This is for AP Biology, but the assigned textbook chapter doesn't contain any information about the question. What are some difficulties animals had to overcome to reproduce on land? Some ...
0
votes
1answer
43 views

Safe level of chlorine in water [closed]

Chlorine is usually mixed in water to make it safe for consumption. What is a safe quantity of chlorine that can be consumed? What are the side effects of chlorine and does this include hair loss? ...
3
votes
1answer
50 views

Incestual Reproduction in Animals

I'm quite curious on how animals view incestual pairings. Given there are enough mates around, i have quite observed that most females (subjects are dogs, cats, pigeons and chickens) would go choose ...
1
vote
1answer
36 views

The suspended cat clavicle

I know the clavicle of the cat floats freely as opposed to be attached as in humans. This is supposed to allow them to be able to squeeze through spaces, according to a quick google search. But how ...
2
votes
1answer
42 views

Which virus capsids consist of only one type of capsid protein?

The Tobacco Mosaic Virus (TMV) capsid consists of many copies of one protein (http://www.rcsb.org/pdb/101/motm.do?momID=109). Which other viral capsids consist of only one kind of coat protein? Does ...
10
votes
5answers
2k views

Do human cells contain only one copy of the genome?

Does each cell contain only a single copy of its genome? Or are there ever 'extra' copies present. Reason behind question: Wondering whether gene mutations could be corrected by referencing a ...
2
votes
1answer
45 views

Why did many odd-toed ungulates become extinct?

There were a lot of odd-toed ungulate animals in the ancient times but now just few of them survived. What is the reason for that?
2
votes
2answers
296 views

Does prolonged exposure to low pitch but low volume noise affect hearing or stress?

This is similar to another post but not quite the same... At work, our ventilation system produces a constant low pitched sound - like a rumble - as well as the sound of air blowing through the vents. ...
1
vote
2answers
41 views

During bridge amplification of DNA sequences, why aren't sequences amplified in both orientations?

During bridge amplification, when sequences attached to adapters on the surface form "bridges" and are replicated, it seems like sequences with either end attached to the surface will be created. For ...
1
vote
1answer
24 views

Does the Peptide bond produce water in our organism?

According to Wikipedia http://en.wikipedia.org/wiki/Peptide_bond , when a peptide bond is made a water molecule is released as a secondary product. So, my question is simple (perhaps silly). ...
0
votes
1answer
339 views

Calculating number of amino acids in mRNA

Assuming there were 20 different amino acids and less than 40 types of different tRNAs found in this alien organism. How many amino acids would be found in the translational product of a ...

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