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2 views

Is reverse tonotopical organisation possible?

In human cochlea tonotopical organisation is that higher frequency sounds are detected near the entrance whereas lower frequency sounds are deep inside the cochlea. Is this tonotopical organisation (...
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0answers
7 views

Do plasma B cells express the BCR or only produce soluble antibodies?

Is the B cell receptor still expressed on a B cell once it has begun to produce soluble antibodies? Is there a gene change that prevents the membrane-bound form from being produced anymore?
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0answers
25 views

Is evolution a means to an end?

In "The Red Queen", Matt Ridley frequently argues that evolution is a means to an end, without providing much explanation for such a big statement. Is this a fact in biology? Do species mutate their ...
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1answer
17 views

Which side of the DNA helix is used for describing SNPs?

In genetic research I often come across references to single-nucleotide polymorphisms (SNPs). An example is rs3184504(C;T). As far as I understand it: In this ...
2
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1answer
28 views

Taq Polymerase's stability at high temperature

I was asked a question as to what is so special with Taq Polymerase that makes it quite stable at high temperatures though its functioning is the same as other DNA polymerases like that of mesophiles. ...
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0answers
5 views

Map view on PopART (Population Analysis with Reticulate Trees)

Does anyone know how to improve map display quality? Images looks pixelated and you cannot zoom in too close.
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1answer
16 views

In human embryology, what starts ovum cell division?

Maybe I am not using the correct search keywords in Google, but I cannot seem to find anything beyond basic information taught in schools about fertilisation of the egg by the sperm. After the sperm ...
1
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1answer
25 views

Human Anatomy and Physiology - The Muscoskeletal System

In the human limb skeleton can you identify a bone which is rather feeble and does not have much role in supporting body weight or maintain posture, and doctors use pieces of it to transplant to other ...
2
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1answer
31 views

Where can I find the data on the geographical distribution of the species of Drosophila within various areas of the world?

Let X denote an arbitrary geographic area where drosophilas occur in the wild. I will need the answers to the questions of the following type: What is the three most occurring species of the ...
1
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1answer
42 views

What is this very tiny (3mm) centipede-like insect?

My kid found this little guy in his bedroom. It’s about 2-3mm long. Lots of legs, and white rings around its abdomen. Any idea what it is? Edit: Location in San Jose, CA.
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0answers
31 views

Why this fish is accompanying stingray?

During snorkelling a couple of months ago on Canary Islands I've been watching stingrays which I think are "Roughtail stingrays". Often this fish (on pic) was accompanying those stingrays. So what ...
1
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1answer
25 views

How do we know how long hermit crabs live in the wild?

This article states that hermit crabs in the wild are extremely difficult to track because they constantly change shells and even gender. Later in the article, they say that hermit crabs can live 4 ...
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0answers
36 views

Are there any ways to force DNA-origami to create a geometric shape from non-nucleotides (not from DNA)?

I mean, can we create with the help of DNA-origami figures that would not consist of DNA, but, for example, carbon? Is it even possible?
16
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1answer
2k views

Do some genes follow Rock-Paper-Scissors model of dominance?

Assuming there are at least 3 alleles of the gene $G$ in total - $G_R$, $G_S$ and $G_P$ - is there any gene for which the following is true? $G_R$ is more dominant than $G_S$. $G_S$ is more dominant ...
1
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1answer
51 views

why tails of some lizards break so easily?

When i was younger once i have tried to catch a ground lizard by its tail but,unfortunately the tail got broken and the lizard ran away.Why the lizard's tail got broken so easily while other animals ...
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0answers
7 views

Rods and Cones functioning in Achromatopsia affected individual

When facing genetically caused Achromatopsia have the cones still been developed by the individual or does the latter completely lack them? I have looked for evidence both online and on some more ...
1
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1answer
19 views

Are highly-polyploid organisms more resistant to ionising-radiation-induced DNA damage?

Homologous recombination, although most famous for its use to mix together maternal and paternal alleles during meiosis, is most commonly used as a DNA-repair mechanism, allowing cells to repair ...
2
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1answer
43 views

Can fructose take multiple forms ? Which of these structures of fructose is correct?

When I look up the structure of fructose I get various different structures Which of them is correct ? Are these all just isomers of fructose ?
1
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1answer
26 views

Is chromosomal DNA more likely to interfere with restriction mapping or PCR analysis in E. coli?

We are characterizing YADH-1 in my biochemistry lab course. Over the course of the first weeks, we harvested E. coli cells, and isolated plasmid DNA via alkaline cell lysis. A previous exam for the ...
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0answers
11 views

Is this a Tabebuia impetiginosa – Pink Trumpet Tree Flower?

Is this a Tabebuia impetiginosa – Pink Trumpet Tree Flower? From Panama.
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0answers
17 views

Evolution and survivability of palm-like plants

I live in a place filled with palm trees. I’ve been wondering for some time now, that if I lobbed off the top of a palm tree, that if the palm would regrow from another new branch? Would the palm die? ...
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0answers
30 views

Can rubbing erect penis against another body cause Peyronie's disease? [on hold]

If during a makeout session, I'm standing extremely close to someone and my penis is rubbing hard against their body and bending, is that harmful? It's not painful but I've heard bending the penis too ...
2
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0answers
49 views

What is the relationship between cell size and metabolism?

What effect does a bigger cell have on its metabolic activity? I understand that bigger cells need more energy, but surely smaller cells may have high metabolic rates too due to their efficiency?
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0answers
15 views

Does any tendon in humans receive a high amount of blood supply? Or is the property of not receiving a large blood supply a constant across tendons?

I read on https://www.physiocomestoyou.co.uk/blog/all-you-need-to-know-about-tendons/ (mirror): [Tendons] do not have a large blood supply. Does any tendon in the human body receive a high amount ...
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0answers
15 views

Plant hybridization - cross clade cross pollination possibility

Is it possible for monocots, like dates, to cross-pollinate with eudicots, such as olives? What is the general rule for how closely related species must be to form hybrids organically?
3
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3answers
92 views

What does the the different arrow head mean?

What does the different arrow head mean? Are there arrows upstream or downstream signaling?
3
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0answers
40 views

What is this small black insect with an orange stripe?

Sorry for the poor quality of the second image, but a slightly different perspective may be useful. This was taken in South Africa, Western Cape during the day. They're fairly small, maybe around 5mm ...
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0answers
22 views

Why is vegetation thornier in arid and volcanic areas?

Alfred Russel Wallace notes in his great book "The Malay Archipelago" in chapter 10 about Bali and Lombok the following: "The dry volcanic soil and arid climate seem favourable to the production of [...
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0answers
15 views

Design an experiment to tell whether the mutation is autosomal or x linked, dominant or recessive [on hold]

I have an urgent discussion question. How to design an experiment to tell whether the mutation is autosomal or x linked, dominant or recessive. thanks a lot
1
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1answer
26 views

Can the word phalanx also be used to describe the finger bone plus the soft parts around the bone?

I was talking in an SE chatroom about fingers, and not being a native English speaker, I had to look up the word used for the part of a finger from the tip to the closest knuckle. I came across the ...
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0answers
17 views

What are the standard bio-safety protocols for preparing plant pathology herbarium specimina?

What are the standard bio-safety protocols for preparing plant pathology herbarium specimina? I searched google but I did not found anything relevant, nor in my textbooks. I want to know about what ...
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0answers
36 views

What are the forces involved in giving each and every one of the $DNA$ (out of kazillions) the helix shape?

I am not a biology student. So please bear with me if the question is nonsense. Almost all of the heavenly bodies are almost spherical. This can be easily explained using theory of gravity. But each ...
2
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1answer
44 views

How do bull semen companies get the semen out of the bulls?

Prompted by this article, which discusses the low number of bulls who sire US dairy cows. How do semen companies extract semen from bulls? The procedure to extract semen from humans is simple enough,...
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0answers
15 views

Why do HGH levels fall with age?

I can't see any reason why. Is "it's genetic" your answer? Is there any real reason HGH levels fall with age?
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1answer
192 views

What is meant by Physarum polycephalum having 720 sexes?

There is currently some media hype about the slime mold Physarum polycephalum, which will soon be exhibited in the Paris zoo. This was my first time hearing about slime molds, but so far so good. ...
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0answers
58 views

Peculiar tree. Fake or no?

I found a very peculiar tree. It looked fake, but it really was true ... What tree is that? I live in the city of São Paulo, Brazil
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0answers
20 views

Title for research in the field of Genetics of Carps Fish Disease

I want to perform research in the field of Genetics (molecular study) of (any Asian fish such as Chinese Carps or Indian Carps) Fish Disease. Please suggest a suitable title and recommend research ...
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0answers
20 views

Confusion on which Type error to use [on hold]

How can I determine what Type error (Type 1 or 2) to use when I want to consult a statistical table when testing hypothesis?
26
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3answers
6k views

Does animal blood, esp. human, really have similar salinity as ocean water, and does that prove anything about evolution?

It is an often-repeated claim that human, and in fact all animal blood is salty because we evolved from aquatic organisms, and that blood has a similar concentration of salts as ocean water, or at ...
3
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0answers
26 views

Why is there such a long interval between ages of sexual maturity and of reproduction in female chimpanzees?

There seems to be some disagreement on the ages at which female chimpanzees typically reach sexual maturity and when they typically first give birth, but regardless, different sources seem to agree ...
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2answers
37 views

Help with gene linkage and mapping!

Here's an interesting question I've been trying to figure out: My annotations are in red. So far, I've figured out: We know 630 colonies survived when plated with ACD antibiotics...meaning they ...
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0answers
31 views

In a sugar such as a disaccharide are both ends of the sugar known as reducing ends?

For example, in maltose (a disaccharide of glucose monomers) are both of the ends either side able to be opened to form an aldehyde group?
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1answer
81 views

Are all bacteria prokaryotes? [closed]

Prokaryotes do not have membrane bound organelles. Cyanobacteria has membrane bounded thylakoids How does this work ?
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1answer
49 views

Can epigenetics have positive impact on the genes are development?

I know that epigenetics have capacity to affect and degrade the genes thereby inducing problems/illness/degradation in body functions. Can they also make better genes or have positive impact on ...
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0answers
29 views

Do animals exist (for example ostriches, chimps, etc.) that develop the need to mate with humans if they are soley raised and socialized by humans?

I just watched a German talk show "Nachtstudio" with the title "Die Graugans und der Mensch" (Gosling and People) about the legacy of the famous ethologist and Nobel Prize winner Konrad Lorenz (https:/...
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0answers
41 views

Is their virus specific genetic code available?

I want to know viruses specific genetic codes, if their, what are all the major differences between eukaryotic and virus genetic codes. Then, how viruses transcribe their genetic information. The ...
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0answers
29 views

How can Haemophilus influenzae survive and grow alone in the human body?

Haemophilus influenzae gets its name from the fact, that it requires nutrients from blood in order to grow. More specifically, I see it mentioned that in vitro they often exhibit the pheomenon that ...
-1
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2answers
53 views

Protein rafts over the Phospholipidic bi-layer

Does any of you know the specific name of the protein rafts that allow proteins to float over a double layer of phospholipids, (cell membrane)? I just feel there should be another name rather than ...
3
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1answer
51 views

How does the body make sure that Vasoactive Intestinal Protein reaches only the target tissue?

Vasoactive Intestinal Protein (VIP) is a 28 amino acid neuropeptide that has several effects in several systems. These include the cardiovascular system, respiratory systerm, urinary system, immune ...
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0answers
46 views

What happens to the water molecule that's produced from dehydration synthesis?

Is it safe to use (like its PH)? Does it get recycled? Does it get sent along with the CO2 and wastes from cellular respiration on the blood train? My textbook or any other website, video does not ...

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