1
vote
0answers
6 views

About binary fission in amoeba [on hold]

We know that amoeba reproduces by binary fission. Then does it mean that it never dies but keeps regenerating? In other words and more generally, does reproduction by fission by unicellular organisms ...
5
votes
0answers
42 views

Identify ~6-7mm long green creature

Here is the creature I found on the glass lid of my light bulb. I guess they are attracted to light as they all concentrate on the light source. I live in Hong Kong. The brown things aren't moving ...
0
votes
2answers
55 views

What is the DNA Sequence for an apple?

The title says it all. I'm just curious. I read that scientists mapped the genome for Malus Domestica, but I can't find a sequence anywhere.If this is a stupid question, I would appreciate if you tell ...
1
vote
0answers
7 views

Through which mechanisms did the Drosophila Histone Cluster evolve?

The Drosophila Histone Cluster is a gene cluster that contains more than a hundred copies of a sequence that encodes several histone proteins. These copies are very similar. My question is what ...
0
votes
0answers
12 views

Why does a wound itch while it's healing?

During healing of wound (almost in final stage) it begins to itch a lot around wound. I wondering what the reason for this is?
-1
votes
0answers
20 views

Eye Accomodation [on hold]

I tried to make a quick search in Google without too much luck, so i stumbled upon here. I am able to accommodate my eyes at will, even though with some constraints: -Accomodation works better for ...
0
votes
0answers
14 views

Nagalase testing any good?

Is Nagalase testing good to detect if something is wrong in the body (ex: cancer)? The next problem I assume would be to know what/where the problem is. To put it an other way: If I understand ...
0
votes
0answers
8 views

Why are porphyrins colored when porphyrinogens are colorless? [migrated]

In Haem synthesis porphyrinogens are colorless but on their oxidation (removing 6 hydrogen atoms) they become colored porphyrins ,also, is red the only color the turn into or it depends ?
5
votes
1answer
84 views

Can someone tell me the species of this lizard?

It's a green lizard with a silver tail, and it has pretty, bluish eyes. I saw it today, July 26th, trying to get some shade on a hot, sunny day (32 degrees) at around 18:00 in Austin, TX USA. It's ...
1
vote
1answer
44 views

Why are nitrogenous bases of DNA hydrophobic if they can hydrogen bond? [on hold]

Why are nitrogenous bases of DNA hydrophobic if they can hydrogen bond? Is it that they are only relatively hydrophobic? This forum explains it but does not give an example of the structure.
1
vote
0answers
17 views

Biological implementation of convolutional neural networks

In computer science, 'convolutional neural networks' are used, that are meant to be inspired by biological network structures like found in the human brain visual cortex. In the computer ...
3
votes
1answer
39 views

Is there a schema for how human behavior is genetically determined?

It seem one can distinguish three different kinds of genetic determinism of common patterns of human behavior: behavior that is directly wired into our nervous system, e.g. face-related mirror ...
5
votes
1answer
54 views

What bacteria do unborn babies contain?

This Scientific American article states that "[human] infestation [by bacteria] begins at birth". This would suggest that unborn babies are free from any bacteria. However, if the mother catches a ...
0
votes
1answer
9 views

What is the spacing between stop codon and transcription terminator?

When one tries to express a protein from a synthetic plasmid in E. coli, how many base pairs should there be between stop codon and the transcription terminator site?
2
votes
1answer
37 views

Is nuclear DNA immuno-privileged?

It is well known that if DNA occurs in the cytoplasm of eukaryotic cells, an immune response may be triggered through a myriad of DNA receptors and pathways as part of the immuno response. Yet, ...
2
votes
0answers
20 views

How does being afraid or nervous affect mental performance?

It's known that when somebody is not relaxed (nervous,worried....) , they can't concentrate , what exactly in being nervous is the problem?
0
votes
0answers
12 views

Why we see a reddish vision in dark room after seeing a bright light?

When you enter a dark room after seeing sunlight or other bright light, you see a reddish speck of light hovering around your vision. This vision generally disappears after a few minutes. Why this ...
-1
votes
1answer
42 views

Can plants feel pain? [on hold]

I was wondering whether plants could feel pain, for example, does grass feel pain when you mow the lawn? Or do the plants and trees that grow vegetables and fruits feel pain when you harvest them? ...
1
vote
1answer
29 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 ...
7
votes
1answer
52 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
0answers
15 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 ...
4
votes
0answers
41 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 ...
-1
votes
1answer
32 views

People who are very “aware” or very sensitive, is the brain more advanced or less advanced? [on hold]

Usually when we think of people who are very aware of their surroundings or very sensitive to the subtleties in all situations, we assume that it is because their brains are more advanced so they can ...
2
votes
0answers
22 views

Metabolism priority in poisonings

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
37 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 ...
4
votes
3answers
69 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 ...
-3
votes
0answers
34 views

Why do Shiitake mushrooms grow on logs? [on hold]

Why do Shiitake mushrooms grow on logs? I know some mushrooms can be grown in a medium. Why logs?
-1
votes
0answers
17 views

Neuroscience - emission of smells [on hold]

My question was erased by the "Mad Scientist". I would be grateful for more details on a fact (i.e. Electronic transmission of smells to a human through radio waves). Someone is probably an expert on ...
-2
votes
0answers
36 views

Importance of Biodegradation pathway over other pathways

What is the importance of biodegradation pathway over other pathways? This question occured when I saw this paper: Fenner K, Gao J, Kramer S, Ellis L, Wackett L. Data-driven extraction of relative ...
6
votes
1answer
71 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 ...
-4
votes
0answers
34 views

The dangers of Optimism, explained using dopamine [on hold]

The dangers of Optimism, explained using dopamine -Deleted-
1
vote
1answer
36 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 " ...
0
votes
0answers
38 views

Why does water feel colder than air at same temperature? [on hold]

If you go swimming and the water is the same temperature as the air, when you first jump in, the water feels colder then air temperature. I guess this has something to do with Heat-Conduction, like ...
2
votes
1answer
23 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
41 views

Why are there no complex hermaphrodite land animals? [on hold]

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 ...
2
votes
0answers
26 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 ...
7
votes
2answers
70 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
285 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
30 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 ...
-2
votes
1answer
31 views

Why do tomatoes look so much like pomegranates? [on hold]

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 ...
1
vote
2answers
30 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
20 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
11 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 ...
-1
votes
0answers
23 views

X-linked inheritance [on hold]

The normal mother is homozygous for a deletion in the PDHA1 gene. Her son is hemizygous for the same variant. What is the chance that this son has a disease due to PDHA1 deficiency caused by the ...
0
votes
0answers
34 views

Probability of of one pathway occurring among two [on hold]

Considering the Kegg modules: M00001 M00002 Both of the modules have the same end product, pyruvate. What is the probability of each one occurring? Which pathway has a higher probability of ...
0
votes
0answers
21 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
50 views

Is Circle of Willis unique to humans? [on hold]

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 ...
-1
votes
0answers
34 views

Can tree frogs modulate their infrared output?

In Jurassic World one of the scientists said that tree frogs can modulate their infrared output. Are there any real-life frogs that can do this? Is this based on any actual animals, or is it ...
8
votes
1answer
60 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 ...

15 30 50 per page