0
votes
1answer
37 views

Literature that demonstrates organisms have a competitive advantage in numbers

I'm studying two bird populations that are competing against each other for a resource: Population A and Population B. Population A is present in much higher numbers than Population B, and as a ...
2
votes
1answer
49 views

What is the most reliable tumour suppressing gene for NSCLC?

I was looking at some tumour suppressing genes that can be helpful in diagnosing lung cancer (particularly NSCLC - Non-small-cell lung carcinoma) at an early stage. I came across a few such as p53, ...
5
votes
2answers
1k views

What has caused life to choose this unfathomably tiny subset of all possible proteins?

I wonder why life uses the particular proteins that it does, about 10^6 different proteins, I think? Evolution cannot explain it because the number of possible proteins is far far too large to ever ...
3
votes
0answers
23 views

Is emergence connected to nature's transition between fractal regimes at different size scales?

A fractal algorithm like Mandelbrot is self-similar in all size scales. This is not the case in nature. A tree is fractal in the sense that each branch is similar to the tree as a whole. But that is ...
1
vote
1answer
47 views

Which monkey species features two distinct male phenotypes?

I remember coming across a popular science article years ago about a monkey species which featured two male genotypes: the first were good looking males who acquired social status (as alphas or betas) ...
5
votes
2answers
178 views

Non Coding DNA and its effect on evolution

I had a discussion with a friend of mine; from his understanding, bacteria and other small organisms have higher amounts of "coding" DNA and, as such, are able to evolve much faster than organisms ...
1
vote
1answer
69 views

Alder Tree Root Nodule Origins?

I recently found out that alder trees have root nodules which contain nitrogen-fixing bacteria and that alders are primary colonizers in primary succession. That leads me to this question: since there ...
0
votes
1answer
59 views

Formation of life on other Planets [closed]

At the present time it looks as if there is no other life in the Universe other than here on Earth . If this is true then why didn't it occur anywhere else ? Is it possible for something to happen ...
5
votes
1answer
2k views

What's a mouth ulcer/canker sore “made of”, and why do they develop?

Mouth ulcers are red/white rings with a crater. They are sore and last for 7-10 days. What I want to know is what they are 'made of' - i.e., what is the ring filled with, and why is the centre crater ...
6
votes
2answers
192 views

Latency differences between our senses

I would be interested in knowing how long it takes between the moment something touches our skin and the moment something is activated in the brain. Also how long does it take in total until we ...
5
votes
2answers
177 views

Photolysis of Water?

In chemistry, I studied the decomposition of water as being $2H_2O_{(l)} \rightarrow 2H_{2(g)} + O_{2(g)}$. However, when water is split, the equation is $2H_2O_{(l)} \rightarrow 4H^+ + 4e^- ...
6
votes
1answer
2k views

Powdered meal replacement vs regular meal

Can a person live with this alternative nutrition? Of course, assuming that eating pleasure is assumed the same. The nutrients that contain are far better than average meal a person eats the majority ...
4
votes
0answers
95 views

The ring formation of ringworm

I know ringworm is caused by a fungus on the skin, nails or scalp but what causes the rash to form as a ring instead of like a normal spread out rash?
2
votes
0answers
15 views

Surface Power Density of Fluorescing Reaction

I am looking to find out what is the ballpark power density of a fluorescing PCR reaction using a SYBR Green or Taq Man dye might be. Is it on the order of $E_e=1mW/cm^2$, less or more? Any help of ...
0
votes
1answer
41 views

Energy consumption of a resting synapse

What is the energy penalty of maintaining rarely used synapse? I'm wondering if forgetting is cheaper than remembering unnecessary details.
7
votes
1answer
1k views

Magnetic-activated cell sorting vs. FACS

When sorting cell populations it is possible to use either magnetic-activated cell sorting or fluorescence-activated cell-sorting (FACS). I am wondering when you would choose either technique and what ...
2
votes
1answer
71 views

Is [O2] different in a 5 mL liquid media?

Is there a drastic difference between top and bottom of the tube, with no stirring?
0
votes
1answer
66 views

Do “non-human” animal like cat, dog, bird or fish think about future while sleeping? [closed]

I don't think "non-human" animal like cat, dog, bird or fish think about future while sleeping. I think when sleeping, the "non-human" animal will feel rather think about anything. I think when ...
3
votes
1answer
45 views

Decreasing Solubility as Solvent Moves Higher in Paper Chromatography

In paper chromatography, as the mobile phase (I used 1:9 acetone/petroleum ether) climbs higher and higher, will the solubility of the solutes decrease as the solvent moves higher? I speak mostly ...
0
votes
0answers
100 views

Does ale give less of a hangover than a lager?

I got into an argument surrounding beer type and hangover. Apparently there is a opinion that ales give you less hangover than lagers do (considering same alcohol content consumed). My understanding ...
2
votes
1answer
73 views

Does breathing air containing 3% carbon dioxide gives you a headache?

As far as I know, breathing air containing relatively high levels of CO2 may get you a headache. I also know that CO2 level in the fruit bodies of peppers can reach levels as high as 3% at certain ...
2
votes
1answer
78 views

How do I make conclusions from the autoradiograph of a Southern blot?

Here's another question taken from "Concepts of Genetics," Klug et al (10ed), revolving around a paternity test. PCR and a Southern blot were carried out in order to determine whether 3 chimpanzees ...
5
votes
2answers
46 views

Comparative Genomics

Are orthologs and paralogs examples of conserved genes? Orthologs are the genes or DNA that is present in 2 different species, having once been present in a common ancestor. It comes about by a ...
3
votes
2answers
4k views

Difference between facilitated diffusion and secondary active transport in cells

Specifically, what is the difference between facilitated diffusion carrier processes (passive transport) and secondary active transport co-transport processes (active transport)? They seem to be the ...
5
votes
2answers
334 views

Help me identify this spider from my garden

Found this in my garden today in Sydney, Australia (specifically Lane Cove). Can you tell me what it is?
2
votes
0answers
15 views

variance in zygotic gene expression across species

I found this review on the Maternal-to-Zygotic transition (MZT), describing how developmental control switches from maternally deposited RNAs to zygotic expression. I was struck by figure 1, and the ...
3
votes
1answer
68 views

How is instinct carried from one generation to another?

How can non-structural information, specifically instinct (a fixed pattern of behavior that an organism reverts to as a response to certain stimuli), be passed on from generation to generation (such ...
7
votes
2answers
315 views

What determines the spiral direction of plants?

Some plants and vines spiral clockwise as they go along (right direction) and some spiral anticlockwise (left direction). What determines which direction they spiral along? At first I believed it to ...
1
vote
2answers
65 views

A non human adaptive behaviour with a spandrel

Is there any adaptive behaviour in non humans which, when it is functioning as it was selected to do, creates a spandrel behaviour? In evolutionary biology, a spandrel is a phenotypic ...
2
votes
0answers
16 views

Biofilm microtiter experimental design

We sequenced RNA using RNA-seq from biofilm (attached to bottom) and planktonic growing bacteria (supernatant) in 3 mL microtiter plates. I'm not sure how is possible to obtain planktonic cells ...
5
votes
1answer
142 views

Fats as energy source

As we know that the preferred source of energy for our body (source) are carbohydrates but heart muscle is an exception and need some explanation for this exception, that why the preferred source of ...
3
votes
1answer
121 views

How does a metronome help in controlling breathing rate?

I'm new to the Bio/Medical field so kindly bear with me. I am doing studies on volunteers to formulate algorithms for evaluating Respiration rate from ECG and accelerometer data. I learned about this ...
1
vote
2answers
487 views

Organisms that contain rare chemical elements

By accident, I found a slide from a Polish chemical presentation, that talks about a small group of biological organisms which contain chemical elements not found in the human body, like: B (boron), ...
1
vote
0answers
90 views

Do bacteria precipitate in static liquid culture media?

We performed 36h biofilm cultures and would like to know if this time is enough to planktonic bacteria to precipitate. Since we observed biofilm formation one the surface of the microtiter plate. ...
2
votes
1answer
102 views

Correct/complete representation of RTPCR statistics

In papers reporting a relative quantification of gene expression by RTPCR, I often see a bar chart with mean ± standard error or deviation, with the deviation belonging to biological replicates. This ...
3
votes
0answers
134 views

Current Trend in Evolution of Human Intelligence

Up front, I am specifically not interested in philosophical or ethical considerations re Eugenics and related concepts. In an effort to receive a concise answer I'll post a narrowly defined question ...
6
votes
2answers
922 views

GWAS: why is replication in another cohort so crucial?

Almost all the landmark GWAS (Genome-Wide Association Studies) reviews agree that, for a GWAS finding to be valid, it needs to be replicated in an independent cohort. What exactly is the rationale ...
7
votes
2answers
5k views

Does freezing microorganisms such as probiotics kill them?

Does freezing microorganisms such as probiotics kill them? If not, what is the process that allows them to "come back to life" after the temperatures are increased? As an example, lets say you ...
10
votes
2answers
158 views

Do macrophages get nutritional value from the pathogens that they eat?

X-posted on reddit AskScience here. I know that macrophages engulf foreign bodies and transport them to various waste excretion pathways (sorry if the terminology is wrong), and if the foreign bodies ...
4
votes
1answer
77 views

Why do plants produce so many hybrids as a kingdom?

Why do plants produce so many hybrids? I have read that they are the largest kingdom of organisms to do so. Does this have something to do with polyploidy events?
0
votes
0answers
244 views

Genetic Relationship Matrix

The classical definition of the Genetic Matrix G = ZZ'/2p(1-p) where Z = M - P where P = 2(p-0.5) I don't have a background in biology but understand Maths and ...
5
votes
1answer
51 views

Are prosauropods ancestors of all sauropods?

My daughter, while reading a book about dinosaurs, asked me if prosauropods are ancestors of all sauropods. Are they? From the name ("pro-sauropods"), I guess that they are, but am I right?
6
votes
2answers
4k views

What is the purpose of using two layers of gel in SDS- PAGE?

I just made a SDS-PAGE with a top layer of stacking gel and a bottom layer of separating gel with different pH values of 0.5M Tris-HCl. The stacking was 6.8 and the separating gel was 8.8. What about ...
3
votes
2answers
138 views

What is correct MVM vs. MMV?

I'm writing up a report and I see conflicts everywhere on the internet. Should it be Murine Minute Virus (MMV) or Minute Virus of Mice (MVM). The followup question is does it really matter.
3
votes
1answer
42 views

Forensic genetics- why is mtDNA comparison sometimes better than nDNA comparison?

Why is (in forensic genetics) in some cases more appropriate comparison of nuclear DNA but in some other cases comparison of mitochondrial DNA? Is it because geneticists are sometimes unable to find ...
2
votes
1answer
31 views

Is there any alternative to cryopreserve cell lines without -80 freezer?

My university's -80 freezer just broke down and the repair will take 4 months according to the vendor. Is there any other way to preserve cells? Maintaining lot of flasks until the freezer is repaired ...
6
votes
1answer
298 views

Why is it harder to sequence plant genomes than animal genomes?

Plants seem to be less complex organisms than animals, but despite that there are less plant genomes sequenced. Is that because plant genomes are more complex, for example in terms of regulatory ...
7
votes
1answer
479 views

Why does the membrane of a neuron not stay at its depolarized state?

When an action potential is transmitted along the axon, the membrane reaches its depolarized state by opening Na+ channels. Both K+ (potassium) and Na+ (sodium) are now on both sides with close to ...
15
votes
2answers
325 views

Are there single-celled organisms that have evolved from multi-cellular ones?

I'm reading this paper about transmissible cancer cells in clams (Metzger et al. 2015) and I was wondering if there are any single-cellular organisms that are around today that are suspected as having ...
0
votes
2answers
65 views

Hopeful Monsters in Plants? [closed]

Does anyone know of any research/examples on Hopeful Monsters in Plants? I define Hopeful Monsters as organisms of a species that have macroevolutions to prompt new speciations. These ...

15 30 50 per page