2
votes
1answer
48 views

Regarding the apoptosis mechanisms in cells and cancer

If all the cells in a cancerous tumour had their apoptosis mechanisms 'turned back on' or reactivated or repaired by some 'yet to be discovered' process would this cause the tumour to 'self destruct' ...
0
votes
1answer
16 views

About artificially induced processes that would normally cause a cell to self-destruct

Are there certain biochemical processes that would normally cause a cell to self-destruct but if the cell being tested has apoptosis mechanisms that have malfunctioned or been 'turned off' the cell ...
3
votes
1answer
328 views

Why are Merkel cells innervated by an axon, and not a dendrite?

Here are two images from Google. Afferent neurons receive input and send it to the central nervous system. Input is received by the neuron's dendritic end and send away centrally via axon terminals ...
1
vote
0answers
33 views

Why do Sorghum Bicolor leaves roll up?

In A level Bio today we talked about abcesic acid as a stress hormone, and its ability to reduce osmotic potential around guard cells to close stomata. My question is, is abscesic acid in sorghum ...
4
votes
1answer
118 views

Does transplanted heart have full sympaticus without medication?

I am reading this and this where I am considering this sentence [N]o baseline parasympathetic innervation [in transplanted heart]. Does this sentence imply that the heart work then in full ...
2
votes
1answer
6k views

What is the difference between tonic and phasic firing?

I am reading about dopamine, and I have realized that dopaminergic neurons can fire phasically or tonically. What is the difference between these two modes of firing?
-2
votes
1answer
705 views

Bigger animals needs bigger amount of oxygen?

Bigger animals, like Elephants, or Dinosaurs for example, are in need for more oxygen than the amount of oxygen that small animals need? (humans, dogs, cats, etc) Thanks in advance.
2
votes
1answer
694 views

PCR processes number of amplicons produced [closed]

Beginning with 600 template DNA molecules after 25 cycles of PCR how many amplicons will be produced?
0
votes
0answers
53 views

Phenotype choice for one of a MZ twin pair in a genetic association study

I was having a discussion with a colleague and this question came up... It is commonplace in molecular genetics studies to only genotype one of a pair of monozygotic twins (and then implicitly impute ...
1
vote
1answer
105 views

Salbutamol's Pathways of Interaction and Classification

Salbutamol is a very commonly used direct-acting β2-agonist. This suggests me that it is sympatholytic. However, it has sympathomimetic pathways, see PubChem for Sympathomimetic. I am trying to ...
1
vote
0answers
16 views

Can different strains of Rhizobium share an infection thread or symbiosome?

Rhizobium infection can be triggered at root hairs of legumes, creating infection threads. Can these infections threads be colonized by more than one type of Rhizobium (e.g. Fixing and non-fixing)? ...
0
votes
0answers
43 views

What's the composition of Actinobacteria's hyphae?

I'd like to know which chemical compounds form hyphae in Actinobacteria. Is it the same structure of the cell wall? Thank you
1
vote
1answer
59 views

RNAs arising from intergenic regions

Which type of RNA molecule is coded for in intergenic regions? I think it must be a non-coding RNA but I'm unsure which type.
5
votes
2answers
376 views

How do gory images lead to nausea?

How do gory images lead to nausea? Yesterday my friend visited shock sites (a website). He said that he got nauseous sensation within seconds after viewing the gory images. However, I don't ...
1
vote
2answers
925 views

How can natural selection occur at species level whilst not occuring at the individual level?

The chapter by Douglas Futuyma in 'Evolution' (Losos et al 2013, Princeton) states that natural selection can occur at the species level. Futuyma states that if natural selection occurs at the species ...
1
vote
4answers
390 views

Resilience to the neurotoxins of Indian King Cobra

I read on Wikipedia about this: King Cobra - Wikipedia In Thailand, a concoction of alcohol and the ground root of turmeric is ingested, which has been clinically shown to create a strong ...
1
vote
1answer
214 views

Crude oil contamination hazard

I'm not sure if this is physics, biology or chemistry related so I will start here. I'm from a city (Baku, Azerbaijan) where crude oil is known to be extracted since ancient times. Oil is no longer ...
5
votes
1answer
595 views

In males, why it is difficult to control orgasm?

Why it is difficult to control orgasm in male humans? How are orgasms controlled and what is different between males and females? We can control urine for few minutes, but we can't control orgasm for ...
0
votes
1answer
45 views

MHC-I presentation during infection

Which cell type cannot process and present antigen peptide in association with MHC-I when it is infected?
1
vote
1answer
1k 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
136 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
107 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
145 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
220 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 Weevil"...
9
votes
2answers
4k 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
7k 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
38 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
65 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
46 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
47 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
3k 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
112 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 ...
0
votes
2answers
150 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 ...
3
votes
1answer
37 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 ...
1
vote
0answers
88 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
310 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
63 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
57 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
602 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 inactivated....
1
vote
1answer
88 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: ...
5
votes
1answer
2k 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
58 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
71 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
165 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 ...
1
vote
0answers
26 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
66 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
59 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
3k 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 ...
2
votes
1answer
488 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
142 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 ...

15 30 50 per page