1
vote
3answers
240 views

Why crossing over don't happen in mitosis?

I mean if there would be crossing over in mitosis then there would various nature of somatic cells. May be that's the logic,but what is the mechanism?why there is no crossing over in mitosis? Does ...
1
vote
2answers
39 views

Determination of a chemical compound in a non-homogeneous sample

This is a more generalized question of my other question here. I want to know if it is possible to determine a chemical compound in a non-homogeneous sample. I am asking this because we are aiming ...
0
votes
1answer
49 views

Core architecture of the body encoding [closed]

First of all, I am not a biology guy; I am in Computer Science. But, I have a strong interest in all the mysteries of nature, from universe to human body. So, I want to ask a question related to ...
0
votes
0answers
26 views

Is there a graph or ontology that maps diseases to its possible causes or causing diseases?

I am looking for a mapping, list, ontology or graph that shows the connection between a diseases and its (currently known) causes and/or risk factors. For example a well known risk factor for acute ...
3
votes
0answers
46 views

Human leukocytes (re)circulation/migration in homeostatic state

One can easily find information on the topic of leukocytes trafficking between vessels and peripheral tissues during inflammation. But what happens during normal states when there is no pathology? ...
1
vote
3answers
58 views

Can a portion of human skin cells be modified in some way to generate light? [closed]

I have come across some species of living organisms who are able to emit light at whim. Can that ability be incorporated into a portion of human skin (a specialized tissue)?
1
vote
0answers
98 views

Is a hard slap to the head a medical emergency? [closed]

I was just slapped in the head twice by my older brother (we had a fight). He hit me pretty hard with an open palm on the side of my skull, but I didn't feel dizzy or become unconscious. The stinging ...
3
votes
1answer
29 views

Authority on Microbiological Definitions

Is there an authority on definitions for molecular microbiology concepts, like an IUPAC book for chemical definitions? The particular definition I am debating is chromatin. Some say it encompasses ...
4
votes
2answers
72 views

Lyonization vs Genetic Imprinting

Lyonization is the process in which there is inactivation of an X chromosome in females. This process is implicated in mosaic forms of turner's syndrome (in this case the altered ...
1
vote
2answers
42 views

How does one calculate how to dilute a solution to working strength? [closed]

If I'm loading a 3.5ul PCR onto an agarose gel, how do I calculate how much of the 6x loading dye to add?
7
votes
3answers
264 views

Can the human brain be reduced to a binary system?

Does the brain really function like a computer as in, ultimately every response is related to a binary sequence based on whether particular neurons fire or not?
3
votes
1answer
98 views

Why is the upper respiratory tract so vulnerable to infections?

Wikipedia has the following statement on its Upper respiratory tract infection page: In United States URIs are the most common infectious illness in the general population. What is it about ...
3
votes
1answer
72 views

What happens to the umblical cord inside the mother?

After giving birth to a child, the umblical cord is cut (and stored if they want). The end connected to the child's navel will fell off eventually but what happens to the end inside the mother? Will ...
3
votes
1answer
56 views

How does Hemocytoblast constantly get formed into so many blood cells and yet remains there in the bone marrow throughout the lifetime?

I mean, Hemocytoblast is a stem cell which is constantly being differentiated into daughter cells and leads to formation of all the blood cells (having short and limited life spans), so how come those ...
7
votes
1answer
64 views

What species is this? Seashell from Indonesia

Anyone know exactly what species this is? I gather it may be an auger (family) or cerith (family) of some sort. This particular one is native to Indonesia's black beaches. Again: genus and ...
0
votes
0answers
21 views

How can I classify Breast Cancer if I have incomplete receptor information?

I have a clinical data table for a cohort of Breast Cancer patients and I want to classify them as being either triple negative or triple positive. You can find the file here. For some of the ...
5
votes
2answers
77 views

Why are there no artificial wombs yet?

If the conditions within the womb are mimicked, and proper amniotic fluid with constantly recycling nutrients is maintained, is it not possible to obtain an artificial womb? Is there anything missing? ...
3
votes
2answers
61 views

Can genetically engineering the DNA of a human zygote, make it a twin of another human in entirety?

My question is simple. If I wanted to make an exact twin of an individual, will genetically engineering the DNA of the zygote to match with the individual suffice?
1
vote
0answers
14 views

How does so many replicas of different kinds of blood corpuscles form from different cells in the bone marrow? [closed]

I am interested in the process by which so many identical blood corpuscles form from an entirely different cell (within the bone marrow) altogether. How does these cells form?
2
votes
1answer
446 views

Can DNA & RNA be considered as nature's programming language?

The final frontier of Biological Sciences could be considered understanding the effects of variation in the DNA (and RNA). If after fertilization the DNA of the zygote could be genetically ...
12
votes
3answers
3k views

Superhuman eyesight

My ten year old son was reading car number plates that were too fast, too far away and at the wrong angle for any of us to read or even believe that it was possible for him to read. We thought he was ...
9
votes
2answers
101 views

Why can good music raise goosebumps?

Listening to really good music right now, I was wondering why it raises goosebumps. Is there any physiological reason for this reaction to specific wavelengths or something? EDIT: Due sometimes ...
1
vote
1answer
43 views

What is the expected number of children that need to be born for every possible point mutation to occur once? [closed]

I'm reading The Perfect Health Diet, and in it the author says that the probability of a point mutation is (175/3*10^9) per new child. He then goes on to write: In the Paleolithic, with 100000 ...
5
votes
1answer
365 views

Chromosome and chromatid numbers during cell cycle phases

A diploid cell in G1 has 6 chromosomes. How many chromosomes and how many chromatids are present in each of the following stages? Here is what I am guessing G1: 6 chromosomes ; 6 chromatids G2: 6 ...
6
votes
3answers
165 views

Do both ends of a muscle contract?

I was under the impression that both ends of a muscle contract. For instance, the fibers of the biceps run parallel to the humerus so I thought they pulled toward the middle. But now I'm confused ...
1
vote
0answers
74 views

How does a baby retain a blood group different from it's mother, in her womb?

It's a well-established fact that blood group is decided by genotype. But, when a new child starts it's journey in the womb, then the mother's blood (along with it's agglutinins and agglutinogens) ...
6
votes
1answer
583 views

Why does a light object appear lighter in your peripheral vision when it's dark?

So, I am not sure I can reproduce it via images, but the steps are: 1) At night, open a window and have a look at the surface of the earth 2) Suppose there's an object that reflects a tiny amount of ...
3
votes
1answer
89 views

I found these skulls in a old bottle in the woods. Can you tell me what they are?

Can you help me identify these skulls I found in an old bottle in the woods?
7
votes
1answer
117 views

What creates the feeling of 'excess' blood pressure to an area of the body?

If I hang upside down, and feel blood rushing to my head, what structures are actually responsible for me "feeling" this excess flow of blood? Baroreceptors? Mechanoreceptors? Something else? ...
4
votes
2answers
1k views

What is biological dark matter?

I recently stumbled upon the Biological Dark Matter wiki page. Its pretty light on details, but it appears to be genetic material found in humans that doesn't fall into currently classifications. ...
2
votes
1answer
53 views

Do all sources supply all sinks on a plant?

Sources include any exporting organs, typically mature leaves, that are capable of producing photosynthete in excess of their own needs. Sinks include any nonphotosynthetic organs of the ...
2
votes
0answers
19 views

Why sudden stresses cause stuttering and/or other impairs in children?

The question is simple: Why sudden stresses cause stuttering and/or other temporary or permanent impairs in children (and even adults)?
6
votes
1answer
542 views

Are sensory receptors neurons?

Background There are many receptor types in the body, with various functions and various mechanisms of transduction. Receptor cells are considered to be part of the peripheral nervous system, as they ...
0
votes
1answer
52 views

Why does an complete molar pregnancy not result in a clone?

Complete molar pregnancy is one where an ovum devoid of nucleus is fertilized by a sperm after which the haploid set of chromosomes double to form a diploid set. As far as my understanding extends if ...
5
votes
2answers
60 views

what does Pro→Glu substitution mean?

Considering the paper: A single amino acid in E-cadherin responsible for host specificity towards the human pathogen Listeria monocytogenes in the abstract portion, what does Pro→Glu mean? Does it ...
2
votes
0answers
53 views

Is it possible that weak memory is due to interference between signals in the brain?

"Weak memory", as used in this question, refers to the inability to retrieve a memory that a person otherwise knows he has memorized earlier. An example of this is some fact snippet that the ...
9
votes
2answers
162 views

How can action potentials be generated through thoughts?

I think I understand how a signal is transferred from neuron to neuron (from How do the brain and nerves create electrical pulses?). My question, however, is not about the standard textbook material ...
1
vote
1answer
39 views

Is it possible for a human to get rabies from a rabies vaccine meant for dogs?

What would happen if a human was injected with a rabies vaccine meant for dogs? I know vaccines can contain weak or dead strains of the virus, but is it possible that the human could become infected ...
6
votes
1answer
45 views

Has the protein composition (with identification) in honey and other honeybee byproducts been studied?

I am interested in studying honey and other honeybee byproducts. I have not been able to find sequence or structure records for any of the contents of honey. In particular, I want to study the ...
3
votes
0answers
89 views

How close to Earth's core can organisms live?

We don't to know much about organisms living deep below the Earth's crust. Recently a team led by S. Giovanni discovered some microbes 300 m below the ocean floor. The microbes were found to be a ...
1
vote
1answer
60 views

Does DNA Ligase look for complementarity in sticky ends?

Can DNA ligase seal two non-complementary sticky ends if the reaction is incubated at the optimum conditions ? I do almost 100% double digestion in the lab. However, during ligation, when I do a ...
4
votes
1answer
197 views

Relationship between nerves and axons

I just wanted to get a realistic viewpoint of our nervous system. I understand arteries and veins, but I wanted to know how similar our nervous system is to that? I understand we have neurons ...
5
votes
1answer
137 views

How does food intake affect medicine? Why pill instructions recommends taking them before (after) meal?

Even simple vitamins seem to have this in the instruction. Why is is so? Is there some simple model of how do pills interact with food? Does it depend on the food type? (What about drinks?) Should ...
1
vote
0answers
115 views

Why do plants produce so much more sugar than they use?

I recently asked the question, "Do plants need O2 to consume energy they've stored via sugar?" to which @canadianer responded, "Yes, plants require oxygen to generate ATP from sugar. However, they ...
0
votes
1answer
24 views

Do plants need O₂ to consume energy they've stored via sugar?

This question came up as I work my way through the answers to another question I just asked. My understanding is that plant photosynthesis looks something like this (though with lots more going on ...
0
votes
0answers
18 views

Why didn't animals evolve wheels for locomotion on land? [duplicate]

It seems that our technology heavily favors wheels for the locomotion of machines over land, but evolution came up with legs instead. The following assumptions might be wrong, I'm merely speculating, ...
2
votes
2answers
63 views

Protein Structure Parameters

I'm wondering about the minimal set of parameters necessary to define a protein's structure. My understanding is that the backbone geometry is defined by the phi and psi angles (torsion angles), and ...
2
votes
1answer
27 views

Could someone entirely absorb smells by smelling?

When smelling, your nose detects the smells by absorbing them. Does this mean that, if you were in an enclosed space, you could smell so much all the smell goes, and there is none of that molecule ...
2
votes
1answer
158 views

Proteins: Post translational modification

I am a physicist and trying to understand some protein chemistry for a small project. Basically, amino acids combine to form proteins and after forming the primary structure, some chemical ...
1
vote
0answers
36 views

Does Smartphone cause ear pain? [closed]

I used samsung galaxy y for last two years. I used to speak more than 3 hours per day in the phone. Now if i bring any smart phones near to my ear, i can't bear the pain. I have little cold and 4 ...

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