4
votes
1answer
38 views

Why lab technicians use indirect (antibody reaction) method for diagnosing?

In microbiology we have two types of microbial diagnosis. The direct method is where we detect the invader's DNA, Antigens or culture to see the exact pathogen while the second, indirect, method is ...
4
votes
2answers
478 views

Is it true that bees and wasps don't sting if struck by hand while they are in flight?

Is it true that wasps don't sting if struck by hand while flying? I know of one person who claims to have done this at least 20 times and has never been stung. And out of curiosity (not that I'd want ...
18
votes
5answers
3k views

If a trait would be advantageous to an organism, why hasn't it evolved?

If a trait would be advantageous to an organism then why hasn't it evolved yet? Conversely, if a trait is not advantageous or mildly disadvantageous, why does it exist? In other words why does ...
4
votes
2answers
87 views

Does learning increase the number of neurons in the brain?

I am attempting to understand neurogenesis related to learning. Does learning increase the number of neurons in the human brain? What would be some good scientific publications to read?
6
votes
1answer
73 views

Why do skinny people live for shorter than the norm even though calorie restriction extends life expectancy?

If I understand correctly, calorie restriction may extend life expectancy slightly (not proven exactly how much for human). But according to the statistics, skinny healthy people have even shorter ...
10
votes
1answer
66 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 ...
2
votes
1answer
33 views

Why is there a compound highlighted in red in a KEGG Module search?

Considering the following module: http://www.kegg.jp/kegg-bin/show_module?M00115+C00003 why is the compound C00003 marked in red?
0
votes
1answer
25 views

Presence of reaction module in bacteria but not in Eukaryotas (human)

From the statistics page, I found that the Module-M00008 is present only in bacteria and not Eukaryotes. Why so? I noticed that all the compounds necessary or the reaction are present in human body ...
1
vote
1answer
38 views

shRNA knockdown not showing with Western

I've recently been performing shRNA transfections and was hoping to get some advice on why I'm not seeing any knockdown via western blot I transfected by MDAMB468 breast cancer cell lines with shRNA ...
1
vote
1answer
31 views

Can roots have cuticle, especially aerial roots?

In my school biology book, it is written that cuticle covers the epidermal cells in aerial parts of plants and root epidermis doesn't have cuticle. My question is that whether aerial roots, in plants ...
3
votes
2answers
32 views

Cell line immortalisation biosafety

Cell lines are often immortalised by artificial expression of proteins which specifically cause the knockout of important cancer suppression genes or the activation of proto-oncogenes. Cellular ...
6
votes
2answers
46 views

Can a woman possessing 1 mutated allele show attenuated color-vision deficiency?

Women possess two X chromosomes. However, during development, when the embryo has about 32 - 64 cells, one of these chromosomes is randomly inactivated (in each cell) by an lncRNA named Xist. As a ...
3
votes
1answer
50 views

Color vision across species

Is it true that color vision is sex-linked for all species with binary sexes? Is there an evolutionary significance to the fact that color vision is X-linked in humans? E.g., only female humans can be ...
1
vote
1answer
13 views

What information does the KEGG Module statistics page show?

While browsing through the home page of KEGG Module, I clicked the button named Module statistics. Can someone tell me what does these numbers signify? What are they the statistics of?
1
vote
2answers
41 views

Difference between modules in KEGG Module

The KEGG module M00115 includes a set of reactions while M00542 does not have any; it just shows the list of enzymes. Is the reaction set for M00542 still unknown?
2
votes
2answers
60 views

Does “squinting” make you concentrate better on a logic test?

We have all had those moments of intense concentration on some tough exam, perhaps a college test or whatever... Why is it that when we squint, it feels like we can focus and concentrate better on ...
2
votes
1answer
1k views

Is it possible to still grow taller after growth plates have been closed?

In addition, when do we know we stop growing taller? Or we keep growing taller? To the first question: Recently, I went to a doctor to have a check up, he said that my growth plates are closed and ...
5
votes
1answer
239 views

Why did Opabinia have 5 eyes?

I recently read about a fossil called Opabinia. What intrigues me is that it had five eyes. I was under the impression that most features, such as eyes, ears and legs are always even-numbered, i.e., ...
3
votes
1answer
21 views

Why is the administration of exogenous Anti-D not harmful to the foetus?

Haemolytic disease of the newborn can result from Rhesus incompatibility in utero. In this disease a Rh-ve mother becomes exposed to the antigens of a Rh+ve foetus by fetomaternal haemorrhage causing ...
3
votes
0answers
22 views

How do paper wasp larvae not fall from their nest?

There is now a paper wasp nest hanging from the eaves of my bedroom. Not very big, I supposed about a hundred chambers and about 7 to 10 adults in total. I observe it every now and then. It just ...
0
votes
1answer
41 views

Why is Benzylpenicillin better in Bacterial Meningitis than Amoxicillin?

Both are beta lactams. However, benzylpenicillin, which is also called penicillin G i.e. narrow group antibiotic. I have now in both the following as a mechanism of action Binds to PBP in ...
-4
votes
1answer
35 views
3
votes
1answer
31 views

Who compared developmental biology to crystallography?

I need to find out the name of a nineteenth century biologist who compared developmental biology to crystallography. His idea was that crystals are formed from 'cells' (defined molecular units) that ...
0
votes
0answers
25 views

What chemical produces the classic “roach spray” smell?

A long time ago (early '80s), in a galaxy far, far away (MIT), I lived in a dorm with a roach problem. The facilities people kept the roaches in check with a specific insecticide that had a very ...
-4
votes
2answers
40 views

Why does a gene have two alleles? [closed]

Why does a gene have two alleles? When there is a gene for producing the color pigment for a flower, why are there there two alleles, producing either same color or different color (homozygous and ...
3
votes
1answer
31 views

Is MHC1 knockout sufficient to prevent transplant rejection?

A few days ago I read about MHC1 knockout pigs for organ transplantation research. I was just wondering, is it enough to knock out MHC1 in the donor (lets say from same species, pig to pig) for ...
1
vote
1answer
44 views

Can we change the direction of a neurological signal? [closed]

My question is can we change the direction of a neurological signal? When a neurological signal is generated it goes to the brain. Along the way it passes synapses. Can we make it change it's pathway ...
1
vote
1answer
36 views

Are these termites?

These are outside a window in Phoenix, Arizona. I looked on the internet for pictures and these guys looked very similar to winged termites.
-1
votes
1answer
47 views

What are 'factors' in biology? [closed]

My question is what does the word 'factor' mean in words like transcription-factor or nerve growth-factor? What is similar between these different compounds such that they deserve the word 'factor' in ...
2
votes
2answers
31 views

How do t-lymphocytes become mature if thymus has lost its function?

The development of t-lymphocytes are done by thymus and we also know that the thymus degenerates before puberty and we also know the maximum lifespan of WBC's is 15 days. So, how do t-lymphocytes ...
14
votes
1answer
20k views

Can a person really die quickly from biting their tongue?

A common trope in certain circles (like Eastern martial fiction), is someone committing quick suicide by biting his or her tongue. But is this really possible? The internet turns up millions of ...
0
votes
1answer
36 views

Would a human survive eating only living ants?

After reading an admittedly foolish question about 1 googol ants vs. 1000 humans, I had a question. Could a human survive solely on eating ants (common ants, not the stinging kind, or leafcutters ...
3
votes
4answers
645 views

Do plants with non-green leaves have chlorophyll and photosynthesis?

Is it even possible that plants with non-green leaves have chlorophyll, and do such non-green leaved plants carry out photosynthesis?
1
vote
0answers
13 views

Why can't diamine oxidase be supplemented?

I've read that diamine oxidase cannot be supplemented from an academic article but it had no explanation as for why. I am curious as to why this? Article reference: ...
3
votes
1answer
40 views

Are there journals for theoretical models of protein-protein interactions?

Are there respectable scientific journals for publishing models of protein-protein interactions obtained by docking simulations? I would also discuss the biological significance of the particular mode ...
1
vote
0answers
32 views

Can I explain the kinetics of a ligand looking at the ligand-protein co-structure?

Can I explain the kinetics of a ligand binding to a target protein (association and dissociation rates) by looking at the protein-ligand co-structure? Editing my question after a few comments: I ...
3
votes
1answer
26 views

Sex biased gene expression in the X chromosome

It has been shown that the X chromosome is frequently enriched for female biased genes, and has a deficit of male biased genes. For example in this paper, and this one. However, I'm struggling to ...
29
votes
5answers
2k views

Why did life not evolve to use radio?

We use electromagnetic communication everywhere these days. Cell phones, wifi, old-school radio transmissions, television, deep space communication, etc. I'm curious about some of the possible ...
12
votes
3answers
1k views

Databases for gene regulatory network graphs?

What databases are available for gene regulatory network graphs starting from a given gene? For example, starting from p53 gene, where can I find a gene regulatory network image that can be exported ...
18
votes
1answer
922 views

Can beavers control the direction a tree falls?

We humans can easily control the direction a tree falls by making a number of strategic cuts, essentially creating a hinge: This prevents trees from falling on equipment and people and sets them up ...
1
vote
0answers
21 views

Does anyone know what type of Cocoon is this?

I am really concerned with this since I've never seen a cocoon this color before and can't find it anywhere on the internet. I found it just laying on the ground not attached to anything, but it ...
0
votes
0answers
19 views

Identifying Bacteria

I have a symbiotic colony of bacteria and yeast (SCOBY) that I'm trying to identify. How would I go about determining what the bacteria is? I can do spectophotometry, thermocycling, gel ...
0
votes
0answers
53 views

Phytoestrogens from hops in beer and estrogenic activity in humans

There is a saying that phytoestrogens from hops can cause breast growth (gynecomastia) in male beer drinkers. Are there any reliable studies linking beer consumption to increased estrogenic activity? ...
0
votes
3answers
48 views

Sense and anti sense strand

Why the sense strand is only involved in transcription though the antisense strand just has the compliment strand of the sense strand?
2
votes
1answer
44 views

Which enzymes degrade dynorphins and what drugs inhibit these enzymes?

Which enzymes degrade dynorphins and what drugs are there available to inhibit said enzymes?
1
vote
0answers
38 views

Random small after-images of things not really there [closed]

I am 44 years old and have noticed that I often get small blotch afterimages that last for about 5-10 mins. Normally, everybody gets these when they look at a bright light. I seem to get these every ...
5
votes
0answers
63 views

How to fix a small pond that has become stagnant? [migrated]

I'm working in a park and we have a small pond a part of a river system that has become stagnant, mucky and smelly. The river that previously ran into the pond is no longer there and we'd like to be ...
5
votes
3answers
5k views

Laying eggs vs giving birth: is there a connection with internal vs. external ears?

I have heard that "The animals who have their 'EARS' outside their body give birth to their young ones and the animals who have their 'EARS' inside their body lay eggs." Is this true? Are there ...
3
votes
2answers
53 views

Energy transformations in chemiosmosis and ATP synthase

In terms of energy, how does chemiosmosis drive ATP synthase? How does electrical energy turn into mechanical energy and then into chemical energy? Would the movement of $H^+$ be considered passive ...
2
votes
0answers
24 views

Why does bacillus thuringiensis produce bt toxin?

Background : B.thuringiensis produces an inactive crystalline toxin during sporulation which when ingested by an insect, gets activated and causes pore formation in gut , subsequently leading to death ...

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