1
vote
0answers
64 views

Are humans the only living species that have the concept of exercise? [closed]

Humans have the concept of working out and exercising to keep themselves healthy. I have not heard of any other species that does the same, but I am just being ignorant. Are humans the only living ...
8
votes
1answer
225 views

What's the difference between growing cells in culture and cloning them?

The wikipedia page on Hela cells refers to George Gey being able "to isolate one specific cell, multiply it, and start a cell line." Later it says, "In 1955 HeLa cells were the first human cells ...
3
votes
1answer
54 views

About sharks and how they find fish

Other than olfactory senses do sharks use some kind of sense that uses electromagnetic waves? Is this similar to an electric eel? I saw a book with the cover statement 'Sharks never get cancer'. IS ...
4
votes
2answers
55 views

Is chloroplasts per cell indicative of the photosynthetic power of a plant?

Plant-A has on average N chloroplasts per cell. Plant-B has on average M chloroplasts per cell. If N > M, is plant-A more efficient in turning carbon dioxide into oxygen? Also, is it possible to see ...
1
vote
1answer
31 views

PSI-BLAST website algorithm parameters

http://blast.ncbi.nlm.nih.gov/Blast.cgi In this website, when I want to apply the psi-blast algorithm on a sequence, under the section of algorithm parameters , what does PSI-BLAST threshold mean? ...
2
votes
1answer
68 views

How does an embryo know where to grow limbs etc

For example you have a cell or already a bunch of cells. Those cell(s) divide and after several week you have a grown organism, for example a human with limbs, several different organs etc. However, ...
2
votes
0answers
58 views

How many proteins are synthesized in human body throughout life?

My idea to calculate this is: Define up to what age will do the calculation. (for instance 60) Determine how many cells born and died up to that point in life. (by type of cell) Determine how many ...
0
votes
1answer
53 views

Whats the difference between voltage gated and ligand gated neurons? [closed]

How are they similar and how are they different?
2
votes
0answers
47 views

What makes living beings alive? [closed]

To clarify, I'm not asking about the common properties of living organisms, such as reproducing and having a metabolism, etc. What I'm curious about is, what is the difference between organic ...
0
votes
0answers
31 views

What is a good source that will help me classify protists?

I am a 15 year old that enjoys looking at the micro world. The only issue that I have is that I can't find a good online source that will help me classify the name of the micro organism that I'm ...
2
votes
2answers
82 views

To get Standard ECG from PhysioNet?

I am trying to get standard ECG by using PhysioNet's ATM with parameters but I get It should be something like How can you get complete standard 12-lead ECG out of Physionet database?
1
vote
0answers
26 views

Why does K+ have more concentration inside of the cell compared to outside of the cell? Why is Na+ and Cl- the opposite?

Can someone tell me the fundamental reason why K+ has low concentration outside of the cell and more inside of the cell?
0
votes
1answer
41 views

Can anyone remind me of the name for the inter-scapular space on the back?

It's one of those names which are often said not to exist, like philtrum. Thanks
4
votes
1answer
34 views

protein-binding sRNAs

I am actually a computational biologist, pardon me if my question description is a bit off-note, my curiosity is driving me on A bit of background and context: In bacteria, a regulatory protein ...
12
votes
1answer
67 views

What is the mechanism responsible for the periodicity of hiccups?

Hiccups (singultus) are caused by involuntary spasm of the intercostal muscles and diaphragm, producing a sudden inspiration with associated glottic closure. It seems the neurobiology of the reflex ...
2
votes
0answers
83 views

Questions about insects eating flour and living in the cracks of a wooden cutting boards

I have a large wooden cutting board which is used in kitchen mainly for preparing egg pasta. The wood type is Populus (poplar or aspen or cottonwood). The main ingredients used with the cutting board ...
1
vote
0answers
40 views

Possibility of Human cloning

Techonology has evolved so much as to clone animals. But, what about human cloning? Is it really possible to create humans in lab? Or is it that technology has not advanced to that level..? Why cant ...
2
votes
0answers
20 views

What is the scientific opinion on plus lens therapy?

Plus lens therapy is the theory that most myopia is environmentally triggered and that conventional corrective minus lenses increase nearsightedness over time. Thus the hypothesis that applying plus ...
2
votes
1answer
18 views

Mechanisms of Flagella

I know that dynein arms and microtubules are involved in the contraction of certain parts of the flagella to produce a wave motion, but I don't understand they are related to the 9+2 structure of the ...
3
votes
3answers
85 views

Stardust or the elements in our bodies

How do we know we are made of stardust? As our cells divide, are our atoms repurposed from existing materials or spontaneously generated? Do we consume materials after we are born that contain ...
4
votes
2answers
40 views

What happens when you mix type A with type B blood (and v.v)

What happens when you mix different blood types that are not compatible? For example, if a patient has type A blood and receives type B blood, or v.v.?
2
votes
2answers
99 views

are the spontaneous generation and evolution the same idea but in a different time scale?

I was in my biology class, learning the history of spontaneous generation and how this idea was discarded. I told my teacher that is the same as evolution but in a different timeline. I Argue that ...
1
vote
1answer
30 views

programmatic fast search of 100-1000 short reads to a public server and obtain list of nearby genes

What are the options for programmatic fast searching of 100-1000 short reads to a public server and obtain list of nearby genes where the reads map? Input: ~100-1000 short reads Output: GFF list of ...
2
votes
0answers
24 views

Can Galactose be synthesized with photosynthesis?

I know that galactose can be found in sugar beets and some gums so I thought plants could synthesize galactose but in my book the answer to the question "Which of these can be synthesized with ...
2
votes
1answer
38 views

How to identify genes?

You and me are different at DNA level. My eye color gene is different from yours. So, my DNA is different from yours. How can a scientist identify a certain gene in a chromosome (and its function) if ...
0
votes
0answers
27 views

How TCGA CNV values are calculated?

When I download CNV SNP array data for ovarian cancer from TCGA data portal, I see some very small numbers like -5, -6 in the "Segment_Mean" column of the segmentation data files. I am very new to ...
4
votes
1answer
88 views

Is ebola non-contagious until symptoms appear? Why?

There's been a lot of talk lately about the man who recently came down with ebola in Dallas, Texas. While I live elsewhere, I keep hearing quotes from CDC and state officials that ebola is not ...
9
votes
1answer
636 views

Horned Mohawk looking insect. What is it?

Any ideas? I didn't know any other way to explain it. I live in Indiana, USA if that helps. Someone said it might be a "stink bug" but I'm not sure and not willing to find out!
0
votes
0answers
27 views

Calculate generations since divergence

Can the formula $\mu = k/(2t + 4Ne)$ be used to calculate the divergence time for any two species given a mutation rate, generation time and sequence divergence value?
4
votes
2answers
211 views

What determines the autumn leaf color?

It is autumn out there. Green, brown, red, yellow, and mixed-colored leaves drop from the trees to the ground. What determines the colors of the leaves? Wikipedia tells me Leaf senescence is the ...
1
vote
0answers
53 views

Suggestions of famous experiments with plant cells? [closed]

I am looking for examples of famous experiments with plant cells. Ideally, the experiment would use: bright-field microscopy staining include several compared groups, so that e.g. one-factor ...
7
votes
1answer
58 views

Can you get enough water by eating only fish?

Scenario: In a boat in the middle of the sea, no freshwater or food stores, no desalination equipment, no rain, but you can catch fish and eat it raw. Can you get enough water this way to survive, ...
6
votes
2answers
111 views

Why can't neurons undergo cell division?

Many cells in the human body can divide and reproduce, making healing possible. Neurons, however, cannot reproduce, which makes diseases affecting the brain particularly crippling. Why can't neurons ...
2
votes
1answer
31 views

Somatic Mutations in meristem tissue in plants

In angiosperm, in which layer of the meristem does a new mitotic mutation occurring has chance to be found in a pollen grain or in an ovule? I also welcome some insights about non-angiosperm plants.
0
votes
0answers
22 views

Epitope annotated protein

What is epitope annotted protein?? The book from which I got this term is : http://www.springer.com/biomed/immunology/book/978-1-4939-1114-1
1
vote
0answers
17 views

charges on the cell membrane

I know that there are flipases and flopases that facilitate this sort of thing, but i'm curious about other possible influences. Can donnan effect be reversed so that phospholipids follow ions. For ...
0
votes
0answers
15 views

Sequence based method for prediction of continuous B cell epitope

What is Sequence based method for prediction of continuous B cell epitope? What is the algorithm/procedure of this method? Can someone please explain this to me in simple language?
0
votes
1answer
46 views

Can ovulation and menstruation occur simultaneously?

Is that possible that ovulation happens in the time of actual menstrual haemorrhage in human females - let say in a case that woman has 21 day cycle and her menstrual period is 7 days? If yes, does ...
4
votes
3answers
213 views

Is human vision sensitive to frequency or wavelength?

In a vacuum, there is a one-to-one correspondence between light frequency ($\nu$) and wavelength ($\lambda$), ie. $\lambda=c/\nu$. But in a refractive medium, $\lambda=v/\nu$, so while the frequency ...
1
vote
1answer
32 views

Can I use grayscale images when working with ImageJ?

I am using ImageJ to analyze Western Blots. I have scanned films in as grayscale images because this is how we did it in my old lab. People in my current lab are not satisfied with that explanation ...
1
vote
0answers
18 views

Evolutionary reasoning behind redundancy of CST and RuST

According to my neuro-anatomy class, both the Corsticospinal Tract (CST) and the Rubrospinal Tract (RuST) control upper limb movement. What the evolutionary reasoning behind this redundancy and the ...
8
votes
5answers
1k views

How can I find a complete human genome file

I'm trying to figure out how I can download a file that represents the complete human DNA sequence. I don't care too much about the format – I'm able to write C++ code to parse it. FASTA seems like a ...
3
votes
0answers
39 views

Which types of blood vessels can regenerate in humans/mammals?

Which types of blood vessels can regenerate in humans/mammals? From what I understand, arteries and arterioles can be created later in life, while this is not necessarily the case with veins. However ...
0
votes
0answers
40 views

5,6-dihydrouracil and 5,6-dihydroxyuracil - how they arise in DNA?

5,6-dihydrouracil can be formed from cytosine after exposure of DNA to ionizing radiation under anoxic conditions [1]. What are other ways by which 5,6-dihydrouracil is formed in DNA? What about ...
4
votes
2answers
61 views

How long does a signal from the brain take to reach the limbs?

If the brain sends a signal to move what's the time it takes the signal to travel via neurons to motor neurons in hands, arms and legs? How fast do those signals travel?
8
votes
1answer
661 views

Does a bigger breast give creamier milk?

It is fairly common for a woman to have one breast larger than the other. I have also heard that, for a breast feeding mother it is common for one of the breasts to yield a creamier milk whilst the ...
1
vote
1answer
50 views

Why do we suddenly forget things, like PIN or phone numbers, that we've known for years?

Is it common to forget a 4 or 5 numeric code which has been used extensively for months and well remembered? There's an article on the guardian describing this phenomenon and by the number of ...
0
votes
0answers
14 views

Unexpected stoichiometry n in ITC experiments

I'm looking at the binding of a small molecule to several RNA constructs and tried to determine the binding constants. To do this I've performed a few ITC experiments on this system, the results were ...
0
votes
2answers
36 views

About animal ecology and one view of this in science fiction

In the movie the Matrix Agent Smith said something like, 'all animals strive to find a natural 'equilibrium' with there environment ,... a harmonious existence with their ecosystem', ( forgive ...
0
votes
0answers
22 views

Why does a pecking order almost always exist in groups of social mammals?

I think the best explanation might come from evolutionary game theory. But, an another viewpoint may be equally important.

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