0
votes
0answers
8 views

Why is the storage ring of a synchrotron vacuum? [migrated]

I know that when the particles accelerated gets to the storage ring they loose energy releasing the synchrotron light but how does the vacuum make it loose energy ? Does it slow it down, increase, ...
1
vote
2answers
108 views

Why do humans have only two nipples?

If other animals have more than 2 nipples, then why do humans have only 2 nipples? Even my pet dog has more than 2 nipples.
2
votes
3answers
107 views

Is there a stem cell/ biogel method exist for muscle and tendon lengthening?

Is there a stem cell/ biogel method exist for muscle and tendon lengthening? It is known that height surgery is limit to six inches with two surgeries and three inches each, it is also true that ...
0
votes
1answer
39 views

What is the exact chemical composition of human body? [duplicate]

I've just watched Breaking Bad Season 01 Episode 03. In that Walter gives the chemical composition of human body. The conversation is as follows Walter White: Let's break it down. Hydrogen. What ...
4
votes
1answer
87 views

Why does hair thicken and become more rough after a razor shave but not after one using a trimmer? [closed]

If a razor cuts only the hair, then how does hair thicken and become more rough with a razor shave and not after one using a trimmer? If both are used for hair removal, why is there a difference in ...
1
vote
1answer
25 views

What is different between the pigment of giraffes and the pigment of flowers?

I saw this video created by Derek Muller and he says there that it is very unusual to evolutionary develop the colour of the skin without the pigment. That sounds reasonable but if so, what nutrients ...
0
votes
0answers
13 views

B-cell and T-cell activation by parasites

Parasitic infections lead to the production of parasite-specific IgE, but they also lead to the activation of nonspecific, polyclonal B-cells and T-cells. How do parasites trigger non-specific ...
0
votes
0answers
18 views

How to do an alanine scan using Rosetta?

I have a complex of two proteins interacting. I define their interface of interaction as the set of residues that are less than 5 Angstroms from each other. I want to do an alanine scan on one of the ...
5
votes
1answer
55 views

Restriction Mapping - Homework question

I have trouble in solving this exercise. Exercise A circular plasmid of 10,000 base pairs (bp) is digested with two restriction enzymes,A and B, to produce a 3000 bp and a 2000 bp bands when ...
0
votes
0answers
17 views

To Study Interactions of two molecules in PubChem

Assume you have two substances Diosminum / Hesperidinum. The former strengthens vascular walls. The latter has role in some glycoside biosynthesis. From Biochemistry, I recall that glycodises have ...
2
votes
1answer
41 views

Why do human ears have a lower boundary for the lowest energy perceivable signal than eyes?

I am currently hearing a lecture about human machine interaction. The lecturer is not a biologist (neither am I, we are both computer scientists), but he makes some statements about biology which I ...
5
votes
2answers
108 views

How Circumcision could reduce the chance for a HIV infection?

Circumcision removes the foreskin of the penis which mainly acts as a cover to the penis. Normally removing the foreskin makes more vulnerable to any STD, so how could circumcision reduce the risk of ...
-3
votes
1answer
73 views

Henrietta Lacks and HeLa cells

Why did Henrietta Lacks die when her cells didn't die? As I understand it only the cells from her cervix were immortal so perhaps the cervical cancer took her life and the cells never died.
1
vote
0answers
33 views

How does the rate of iterations affect evolutionary outcomes? [closed]

I understand that biological creatures evolved through perhaps billions of iterations to get to where we are today. It is easy to see that the more iterations or generations, the stronger and more ...
1
vote
3answers
70 views

How is incomplete dominance different from codominance?

Ok let me start with the definitions of incomplete dominance and codominance. incomplete dominance - The situation in which the phenotype of heterozygotes is intermediate between the phenotypes of ...
-4
votes
1answer
55 views

Are there any similarities in the DNA of a humans and animals? [closed]

As the title says, i've been wondering if there are any similarities between the DNA of humans and the DNA of animals? Like, maybe monkeys are more similiar in their DNA to humans, than dogs are (to ...
1
vote
0answers
21 views

At what stage of embryonic development are allergies determined [closed]

Hope my question makes sense. I'm an expectant father (for the 3rd time), my wife is 3 months pregnant and for the first time in her life she is suffering from weird lumpy rashes that appear ...
2
votes
1answer
31 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
0answers
5 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 ...
0
votes
0answers
7 views

Why merkel cells are innervated by axon and not by dendrite end?

so here's the two pics that i have taken from google images and it really helped me with my question and my question is we all know that the afferent neurons receive senses for CNS which it had to be ...
1
vote
0answers
13 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 ...
0
votes
0answers
7 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 ...
1
vote
1answer
20 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?
-3
votes
1answer
33 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
22 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
22 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
18 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 ...
0
votes
0answers
6 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
12 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
42 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.
3
votes
2answers
95 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
1answer
39 views

Why is deficiency of thiamin characterized by brain malfunction [closed]

Why is deficiency of thiamin characterized by brain malfunction.
1
vote
2answers
55 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
2answers
57 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
46 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 ...
2
votes
1answer
107 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
29 views

MHC-I presentation during infection

Which cell type cannot process and present antigen peptide in association with MHC-I when it is infected?
0
votes
1answer
29 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
91 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
26 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
27 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
0answers
29 views

plot the nucleosome distance to TSS [closed]

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: ...
1
vote
2answers
54 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 ...
6
votes
1answer
1k 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
111 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
31 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
31 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
12 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
23 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 ...
6
votes
1answer
517 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 ...

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