1
vote
0answers
46 views

Where do the H+ ions come from in light reactions?

In the light-dependent reactions of photosynthesis, H+ ions pass to the thylakoid space. Where do these protons come from?
1
vote
2answers
66 views

Why do many DNA solutions contain additional compounds?

DNA solubility data in only water is scarce. A previous question asked for a quantification of DNA solubility in water. It seemed like it would be easily answerable, however isn't quite that simple ...
13
votes
1answer
222 views

Solubility of DNA in water

This would seem to be an easy to answer question, but I was unable to find an answer (in g/L) for generic double-stranded DNA or plasmid neither on Google nor on BioNumbers. I would expect the ...
1
vote
0answers
12 views

Calculating the canopy size (crown) of a newly planted tree at a future date

Assuming that one knows the maximum area of the canopy and the age of the tree when it achieves this. And given an initial canopy size from the nursery. How would I calculate the canopy size at a ...
0
votes
0answers
32 views

How to resist the decreasing of your immunesystem after a cold shower? [on hold]

I have taken a couple of cold showers because I heard of the positive effects. I kindof like to take a cold shower now but I get the cold after I take them. After my first 5 cold showers or something ...
3
votes
2answers
243 views

What does this equation about DNA replication mean?

Could someone help me understand this equation please? I found it in a paper which said that it was DNA replication, but why? $\ce{dNTP + dNMP_{n} -> dNMP_{n +1} + PPi}$ I found that dNTP means ...
5
votes
2answers
149 views

Are we more attracted to people of the same ethnicity? [on hold]

Are humans more attracted to people from their own ethnic groups? I ask this because most of the time people have relationships with people of their own ethnicity, and I wonder if it's purely social, ...
8
votes
2answers
158 views

Does Lucid Dreaming decrease the regenerative effect of sleep?

After watching this SciShow video on sleep, I wonder about lucid dreaming. Specifically: Does lucid dreaming and associated directed agency within Lucid Dreaming decrease the regenerative effect of ...
7
votes
1answer
78 views

What determines the number of chromosomes an organism carries?

This is an extension of this question about What limits chromosomal length?. I am wondering what could be the specific reasons behind the number of chromosomes an organism carries. In other words, ...
38
votes
1answer
3k views

What could cause a forest of bent trees?

While hiking on the northern Idaho-Montana border, I encountered a large area where virtually every tree is bent at the base in the downhill direction. Only the very largest and very smallest trees ...
-2
votes
0answers
56 views

Why does human hair grow over our eyes [duplicate]

As many people who are overdue for a haircut will know healthy human hair will eventually grow to cover your eyes. I wonder- why is this so? In the modern world it is not a problem. We have invented ...
2
votes
1answer
58 views

Has anyone modelled calcium oscillations using Matlab software? [on hold]

I have been trying to model calcium oscillations using MatLab, but I cannot obtain the oscillation. I created a function where I put all the equations and used ode15s to call the function. I have ...
0
votes
2answers
121 views

Has a new functional structure ever been observed arising spontaneously?

Have we ever observed a new functional biological structure arising spontaneously such as a new functional organ (sensory or otherwise. such as tracing some creature in the past few hundred years ...
3
votes
1answer
19 views

Accuracy of best plant growth models?

Given a plant $P$, predict its height $H$ at time $t$ since planting given some environmental variables $E_1, \dots, E_n$. How accurate are the state-of-the-art models for such thing? What data is ...
3
votes
1answer
22 views

Phosphorylation-Dephosphorylation : ATP-driven VS spontaneous

Is protein dephosphorylation most commonly spontaneous (without need of ATP)? I came across some papers that mention it, as well as the opposite case (ATP-driven), but I can't figure out which is ...
3
votes
1answer
65 views

What is this small black bug found in Turkey?

What species is this? It was found in Turkey. It was dead, I did not kill it.
4
votes
2answers
146 views

New GO terms after TopGO enrichment? [on hold]

I ran an enrichment analysis with custom annotations using TopGO and surprisingly I obtained new GO terms inside the significant GO terms. Is that possible? The only reason I can imagine this is ...
1
vote
2answers
219 views

Epinephrine vs. Adrenaline

Both names are widely used, with what appears to me as a slight prevalence of “epinephrine” in scientific literature and an overwhelming prevalence of “adrenaline” in popular media. Are there any ...
3
votes
1answer
22 views

Crow branch pecking behaviour

I was walking through a small park when two crows started cawing at me, and followed me, flying from tree-to-tree as I walked. I speculate that this is a territorial or protective behaviour, but what ...
-2
votes
3answers
100 views

Immortality Gene? Really? [on hold]

I read somewhere in the internet and wondered if human genes have deactivated immortality genes locked somewhere in the DNA strand. Is this statement true? What does it mean for human lifespan?
2
votes
1answer
38 views

Animal identification (larva)

I found a tiny, white animal in my mouth on the morning of June 28, 2015, in Toronto, Ontario. Luckily I don't seem to have hurt it. I was eating some sunflower and pumpkin seeds at the time. I ...
2
votes
0answers
21 views

What are all of the currently known variations of the G zipper motif?

The G zipper motif is found in transmembrane proteins at an above random frequency and there are models explaining how it might help with multiple transmembrane intra-membrane helix bundle assembly. ...
3
votes
3answers
73 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 ...
7
votes
1answer
369 views

Toronto spider identification

I found it in Toronto, Ontario, during early June, 2015. When prodded it seemed to jump around, or at least to move very fast. I can also post a short video of it if needed.
2
votes
1answer
304 views

Crossing white eyed Drosophila with sepia eye

So, I'm doing some drosophila experiments with my high schoolers and I had really poor production of wild type individuals for doing the experiment resulting in not enough to cross with everyone... I ...
5
votes
1answer
31 views

Evolution of diversity and extinction resistance

I saw a comment on an answer to another question that touched on an interesting topic: keeping diversity is useful for parameter exploration or to adapt to future environmental change My initial ...
-1
votes
1answer
78 views

Effect of nerve pills and relationship to Shingles [on hold]

Do nerve pills actually suppress the nervous system and how would that effect the Shingles virus which is known to activate under large amounts of stress?
6
votes
1answer
347 views

Which of the cell types commonly found in mammals has the greatest number of mitochondria?

This is basically a fun question, inspired by this answer on scifi.se. So, which cell type will have the greatest number of mitochondria? Obviously, I am talking about wild type, healthy individuals ...
6
votes
0answers
23 views

Can a lizard shed a regrown tail again?

Some lizards are famous for their ability to voluntarily shed their tail to elude predators (Autotomy). After a while, the tail will be regenerated, though with slightly different qualities, as ...
-3
votes
0answers
14 views

Why does the growth of hair are faster than the growth of other cells in humans? [on hold]

We might have observed that growth of hair is more than growth of any other cells in human body ? Why is it so ?
0
votes
0answers
17 views

Why 'blood vessels' and not 'blood tubes'? [migrated]

I have a silly question. The way I imagine arteries and veins are as tubes that arise from one part and carry blood to the other part. Why do we call them 'vessels' (which reminds us of cooking ...
1
vote
0answers
74 views

Measuring a plant's electric activity any instructions where to place electrodes?

I would like to measure a plant's electric activity / voltage, I've looked online to find out where to place the electrodes and what type of electrodes to use but they seem to very wildly. Any ideas? ...
4
votes
2answers
86 views

Is the water transpired by plants pure H₂O, or does it contain trace minerals?

I'm considering the idea of drinking water that I trap from what is transpired by trees. Interestingly, is this water a fairly (or maybe even extraordinarily) pure form of H₂O, a remarkably pure ...
2
votes
1answer
42 views

What causes head hair to be different than body and face hair?

If you feel your head hair, it typically feels a lot softer and is easier to manage (comb, brush, fix) than a lot of other hair on your body - specifically I'm thinking about beard hair and pubic ...
32
votes
5answers
3k views

Is there an advantage to antibacterial soap?

There are plenty of different hand soaps out there, as well as hand sanitizers. Is there an advantage to soaps that claim that they're antibacterial vs soaps that just say soap? In particular I'm ...
4
votes
1answer
322 views

Is sexual selection evolutionarily advantageous?

Our biology teacher says that peacocks will soon become extinct because of bigger and bigger (and heavier and heavier) tails. Why natural selection did not eliminate sexual selection?
1
vote
2answers
47 views

What's read depth in VCF?

There is an attribute defined as DP (Total Depth) in VCF file format. For example, http://www.1000genomes.org/node/101. What does this attribute mean? If I get a value of like DP=128. How can be that ...
7
votes
2answers
97 views

How is it possible for only one in five children to have brown eyes when their parents both have brown eyes?

I have observed that parents having brown eyes had three female offspring with blue eyes, one son with green eyes, while only the youngest daughter had brown eyes. How can they produce so many ...
1
vote
0answers
25 views

How to be a Noah-esque biopirate and store the genes of every plant and animal [on hold]

Preamble. Please criticize this idea. It is too romantic to be possible. All of the news about the sixth extinction got me thinking about it. Thanks The price of DNA sequencing for humans has ...
2
votes
1answer
31 views

Database of medically validated SNPs

I'm looking for all possible sources of clinically tested human SNPs. There is a handful of databases that store SNPs (like dbSNP), but I only need those that have validated presence/absence of ...
-1
votes
0answers
29 views

What did the transition from ovipary to Hemotrophic viviparity look like? [on hold]

Most evolutionary changes happened slowly over countless generations. Richard Dawkins illustrates this beautifully in Greatest Show on Earth when he describes lining a rabbit up next to all her ...
0
votes
1answer
17 views

Which pair of primers should be used to amplify the ORF in PCR?

So I want to choose the correct set of pair of primers to amplify the ORF of the gene that corresponds to amino acids in a protein. The start and stop codons are underlined. (I know that these need to ...
2
votes
1answer
24 views
0
votes
0answers
22 views

IC50 and area under the curve

I was hoping to get some clarification on how drug response data (i.e. IC50) are presented. On publicly available datasets like Genomics of Drug Sensitivity in Cancer, area under the curve (AUC) ...
3
votes
0answers
20 views

What is the meaning of conservation site in miRNA-mRNA pairing context?

I am not biologist and just work in Bioinformatics field. Does anyone know what is the meaning of conservation in the context of miRNAs and their pairings to mRNAs? Example: Each of these duplexes ...
2
votes
2answers
149 views

How does DNA damage cause ageing in yeast?

As I understand it, in yeast ageing there is daughter cell and mother cell. The daughter cell is has newly "fresh" DNA and mother cell dies after some counts of replication. What happens to the ...
11
votes
5answers
681 views

What is meant in biology by the term “evolved”?

A student asked me this the other day and I thought that I would ask it again here. If one organism is said to be "more evolved" than another, what exactly does this mean?
4
votes
2answers
52 views

Exhalation while holding breath

If you inhale to your maximum capacity and hold your breath for an extended period of time, it begins to feel uncomfortable; slowly releasing your breath at this point seems to provide relief from ...
4
votes
3answers
944 views

Why is wind cold for humans? [on hold]

Coming out of the pool the other day, I felt very cold because I was wet and the wind picked up. My idea is that a "cold" feeling should be associated with low temperatures, but it's indeed wrong. ...
0
votes
0answers
25 views

Why do human have continuously-growing hair on their head? [duplicate]

Why do hair continuously grow on human heads, while the same doesn't happen on other parts of the human body? Where there are hair, they only usually grow to a fixed length; but they seem to have no ...

15 30 50 per page