1
vote
1answer
133 views

What is variation in Speciation

I read a lot about speciation. To my knowledge, A species is often defined as a group of individuals that actually or potentially interbreed in nature and produce fertile offspring. Speciation is a ...
10
votes
1answer
407 views

Does your iris color have an effect on your vision?

I've always wondered if having different iris colors, (eye colors) may have any advantages or disadvantages on ones vision. Specifically regarding the effects of light. Personally, I have troubles ...
2
votes
1answer
277 views

Do the enzymes and compounds in saliva help with stain removal?

Does spitting on stains help with removal? Saliva is high in amylase that should help with the breakdown of protein rich stains like blood and semen. It also contains antimicrobial enzymes and ...
6
votes
1answer
175 views

Are low-intensity radio-waves carcinogenic?

A recent review article, Oxidative mechanisms of biological activity of low-intensity radiofrequency radiation reached a surprising conclusion our analysis demonstrates that low-intensity RFR ...
4
votes
1answer
77 views

Can the liver prioritize it's metabolizing potential?

Let's assume we have two toxins - one of which is routinely metabolized by the liver, and the other is new to the organism (consider for example alcohol in a heavy drinker and any other drug that is ...
3
votes
0answers
112 views

How long does conception take?

I know that conception is a multi-step process. A sperm fuses with an egg. Its contents diffuse into the cytoplasm. Dad's DNA is transported to the nucleus. Proteins are gradually made from Dad's ...
5
votes
3answers
138 views

Why are sight and sound prerequisites for intelligence?

Edward O. Wilson, in The Diversity of Life wrote (emphasis mine): Ninety-nine percent of the animals find their way by chemical trails. […] Animals are masters of this chemical channel, ...
11
votes
3answers
2k views

There aren't any animals like hornets that hunt large prey (like a rabbit, or even up to a deer), right? Why not?

There aren't any eusocial animals (hives of wasps, ants, termites, etc) that hunt large prey, are there? I'm thinking prey in the size range of, say, a rabbit, or even a deer. I can't see a rabbit ...
1
vote
1answer
104 views

A tool to get annotation features by position in the reference genome

Previously, when I needed to find a genomic feature (promoter, CDS, repeat etc) that underwent mutation (SNP) I used my own scripts to load an annotation file, parse it, map the SNP's position and ...
8
votes
1answer
175 views

Database of Geographic Range of Species

Is there a database of organisms which would contain their queriable geographic location? I would need to perform a rather simple query, such as ...
1
vote
1answer
76 views

Genetic Diversity in Mitochondria

As I was studying for my GRE exam, I was reading on Mitochondria. I then remembered that they undergo replication similar to bacteria. So I googled for info and found on Wikipedia that there is a " ...
3
votes
1answer
104 views

Why isn't the upper limit of pain lower in humans?

From what I understand, pain is an useful mechanism that signals us that something is not quite right with our body (in particular, we're under attack). It's good - it alert us and tells us that we ...
1
vote
0answers
97 views

Why are there no complex hermaphrodite land animals? [closed]

The title says it all. I know that 'complex' is a pretty ambiguous term to use, but I can't think of a more scientific term/definition for my meaning. I can't think of any large (larger then a small ...
3
votes
0answers
83 views

What form of reproduction did the first land animals use?

What form of reproduction did the first animals on land use*? Were they hermaphrodites, or did they have male and female sexes? [Is there a proper term for sexual separation in a species?] Were any ...
8
votes
2answers
216 views

Are mitochondria transferable between cell types, individuals and species?

I'm curious about what happens when you insert organelles from a cell into another. In particular, mitochondria. Take two cells from your own body. Somehow extract a mitochondria from one cell and ...
4
votes
1answer
321 views

Does anyone know what kind of caterpillar this is?

I was out hiking, and was walking along the side of a road, and saw this little guy on some gravel. Hes a light blue/grey color, hairy, spotted with red,and looks like he has horns and a tail. I've ...
2
votes
1answer
113 views

agglutination test using blood of the donor and the recipient

we were told that agglutination occurs when the matching antibody react with its antigen on the RBC surface (as antibody B with antigen B).... Also when blood transfusion, Donors plasma with ...
-1
votes
1answer
70 views

Why do tomatoes look so much like pomegranates? [closed]

The pomegranate fruit has been cultivated since ancient times, particularly in the Middle East and the Mediterranean. It has a hard outer rind, and inside are several chambers, each of which contains ...
2
votes
2answers
99 views

What would happen if brain neurons did not reduce their sensitivity to neurotransmitters after prolonged exposure?

From my understanding, neurons decrease their sensitivity to neurotransmitters by reducing the amount of receptors on the cell membrane in response to sustained neurotransmitter activity. One ...
0
votes
0answers
33 views

Impact of hot and spicy food during cold / congested nose

I've observed this many times. Sometimes when im having a cold or congested nose , and i eat spicy food , it feels that the congestion reduces. what is the reason for this besides the fact that the ...
0
votes
0answers
61 views

How are membrane and extracellular proteins delivered to the target membrane?

In bacteria, either folded or unfolded proteins can be trafficked to the membrane or the extracellular space provided that they have the appropriate signal sequences. Once the chaperones or Signal ...
0
votes
0answers
76 views

How to mimic / approach some animals/insects' anabolism?

This article states that some shelled animals - spiders, scorpions, crabs, worms and other creatures - have metal atoms in their claws, jaws and fangs. I believe through anabolism, since they eat ...
1
vote
1answer
91 views

Is Circle of Willis unique to humans? [closed]

I understand that Circle of Willis is a circulatory anastomotic system that provided blood to the brain. I want to understand if this system is unique to humans or does it exist in other species or ...
9
votes
1answer
240 views

Can we change our dopamine baseline levels?

Can we change our dopamine baseline levels? High dopamine levels improve alertness, problem solving, but may also cause anxiety and aggression. I've read that smiling and laughing, eating certain ...
0
votes
2answers
165 views

Human Bones classification and anatomy quiz

I'm a junior Biology Student and I came across this Human Anatomy Question: In respect to the bone characteristics, mark the correct answer: A) Even bones: Palatine, Inferior jaw, Parietal. B) ...
5
votes
3answers
90 views

Why is there a seeming dichotomy between mobility and photosynthesis?

At least among more complex organisms, I cannot think of any examples of highly mobile species (like animals) that also incorporate photosynthesis. Perhaps there are examples that I'm unaware of, but ...
1
vote
1answer
318 views

Operators and Enhancers/Silencers

Wikipedia has two images, of a eukaryotic gene and of a prokaryotic gene. They show the difference that the prokaryotic gene also has an operator while the eukaryotic gene does not. Both also have ...
13
votes
2answers
1k views

Why and how does uniprot list around 150,000 proteins in the human genome?

Using organism:"Homo sapiens (Human) [9606]" as a query in uniprot returns about 146,000 proteins. I was under the impression that there were only 20-25,000 protein ...
1
vote
1answer
263 views

IC50 calculation [closed]

I am a computer science student and I'm in an internship at a genomics and biotechnologies research institute. My current task is to calculate the IC50 and the EC50 given a set of data as a table. ...
1
vote
1answer
89 views

How to compare two RNA transcripts?

In this paper, the cuffcompare RNA package is reported: Because of the stochastic nature of sequencing, assembly of the same transcript in two different samples may result in transfrags of ...
6
votes
2answers
2k views

Why do we produce so many sperm?

So apparently we produce roughly 300 million sperm daily. Is there a reason why this is necessary? Wouldn't a much smaller (but still large) number be sufficient? Like, one million?
5
votes
4answers
153 views

Is Insulin-Glucose dynamic Lotka-Volterra?

From Wikipedia: The Lotka–Volterra equations, also known as the predator–prey equations, are a pair of first-order, non-linear, differential equations frequently used to describe the dynamics of ...
1
vote
2answers
36 views

Secretion in Gram negative bacteria

Among the 6 secretion systems in bacteria, can these 6 ways be sorted out in the order of how harmful it is to the human host? Like say type 3 is highly virulent so that comes first, but I don't know ...
1
vote
2answers
121 views

Definition of “essentially diploid”

While researching the F12 cell culture medium (Ham, 1965), I came across the term "essentially diploid Chinese hamster ovary cells". The terms "subdiploid" and "near diploid" were also used to refer ...
4
votes
1answer
699 views

What determines whether an action potential is inhibitory or excitatory?

What determines whether an action potential is inhibitory or excitatory? Is it determined by the receptors, the neurotransmitters, or some other mechanism?
3
votes
1answer
414 views

Do our belly buttons consist of scar tissue?

I read an interesting post on Facebook the other day saying that we all have a visible scar since birth - our belly button. This got me thinking (and research for me only found results regarding belly ...
2
votes
0answers
33 views

What is the standard protocol for creating permanent stocks from freeze-dried bacteria?

I've received freeze-dried bacteria that I intend to use for a study I'm doing on slime mold; however, I've never dealt with freeze-dried, only frozen, bacterial cells. After reconstituting these ...
2
votes
1answer
197 views

Can cooking oil kill fleas?

I cannot find a reliable way to kill fleas after removing them from my cats with a flea comb. Soap and water does not do the job and they climb back out of the drain. Will cooking oil suffocate ...
5
votes
0answers
78 views

Is there a mechanism by which mammals lose interest in a partner after mating?

I'm reading the book called "Cupid's poison arrow", which revolves around a rather simple assumption: most mammals, including humans have a genetic program that is responsible for ever increasing ...
0
votes
1answer
27 views

Blomberg's K and branch length

Do different values of the smoothing parameter lambda for estimating the divergence times (in situ Sanderson 2002) will affect trait conservatism (e.g., Blomberg's K)?
0
votes
0answers
272 views

Pitch shift in hearing after wisdom teeth removal

Yesterday I had my wisdom teeth removed. This morning, when I heard our phone ringing, it sounded a little lower-pitched than usual (I have perfect pitch). Sure enough, when I opened FL Studio ...
3
votes
1answer
65 views

What is the simplest autotrophic cell?

Very simple cells, such as Nanoarchaeum equitans, require a host to provide certain essential ingredients for life. Complex life-forms (like humans) require a whole ...
6
votes
1answer
74 views

Butterfly identification: Dorset England, July.

Can you please identify this butterfly. It was seen in Dorset England 9th July. I think it is a female Silver Studded Blue.
1
vote
1answer
144 views

Definitions of common and rare disease

Is there an epidimiological way to define rare and common diseases ?
4
votes
1answer
52 views

How do people digest fat after gall bladder removal surgery?

How do people digest fat after gallbladder removal surgery? How can they tolerate a high fat diet?
4
votes
1answer
93 views

Why do low temperatures kill

Why can't we (human, or even unicellular organisms) withstand low (body) temperatures (5 - 25°C). I have a limited background in chemistry and biology, so this might be obvious, but not to me. I know ...
4
votes
2answers
109 views

Is this Heracleum sosnowskyi?

There's a relatively big scare in local news about the Heracleum sosnowskyi plant, considering how dangerous it can be. I was strolling through the park when I noticed these plants - the ones I ...
1
vote
1answer
136 views

Textbook/lab manual for mammalian cell culture

For general techniques involving molecular biology, I know of Sambrook and Maniatis Molecular Cloning which covers many of the standard cloning techniques. However, mammalian cell culture has many ...
2
votes
0answers
25 views

Why are humans mostly right-handed? [duplicate]

Most sources I've seen say that about 90% of humans are right handed, and 10% are left handed. Why is this? My only guess would be that it has something to do with different parts of the brain ...
1
vote
1answer
75 views

Primer Design with Primer-BLAST over specific site

I am trying to design primers using Primer-BLAST such that the forward primer spans a specific base pair site. I am looking at KRAS for which I believe the RefSeq ID is NG_007524.1 and the forward ...

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