All Questions

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What drives the evolution of the relative importance of a the haploid vs diploid phase in the life cycle?

From wikipedia > Biological Life Cycle: haplontic life cycle - the haploid stage is multicellular and the diploid stage is a single cell, meiosis is "zygotic". diplontic life cycle - the diploid ...
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2 views

Bone age And Height

My bone age is 9-10 years old i m 20 years old I want to ask will my height increase ? I really want to grow my height is 4'11.5 I m so worried about it plz help and suggest me natural ways to ...
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0answers
14 views

What is the practical use of one's DNA sample?

I have the opportunity to have my whole genome sampled and receive the raw results. What are the practical use I can make of it? I know of companies (23andMe for instance) who will process a sample, ...
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0answers
6 views

Cause of numbness in feet [on hold]

Can excessive movement (except from walikng) of feet causes numbness in the feet? I repeatedly move my feet and feel numbness.
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0answers
11 views

What is the correct answer? C or D [on hold]

Protein synthesis from amino acids by which structural component? Ribosomes or endoplasmic reticulum
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0answers
16 views

How to get ants/termites to attack

I am working on ant resistant coatings that are meant to make a material resistant to ants or chewing through them. The question is - how do I get ants to attack the material? I have considered ...
2
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0answers
31 views

Why does it take 24 hours for tendons to give feedback on whether the loads they received were excessive?

I heard in this interview of Jill Cook (tendon researcher) on https://youtu.be/GKkSp-TlofI?t=230: Tendons talk to you 24 hours later. So what happens if if I put load on a tendon today, it will ...
7
votes
1answer
535 views

If plants “alternate generations” between sporophytes and gametophytes, why don't we say the same of humans?

I've been reading on Wikipedia about how plants alternate generations between a diploid sporophyte (usually the dominant part) and haploid gametophyte (in flowering plants, the pollen and ovule sacs). ...
-2
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0answers
22 views

Did humans develop marriage soley to control the act of reproduction, or for the act of raising children?

The conservative view summerizes: https://donotlink.it/wGx6 Marriage is the act that consummates the contract, a contract to stay together exclusively in sickness and in health, and to give of each ...
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14 views

Is it possible for a woman born without any eggs to have normal levels of estrogen?

If a woman has no eggs, she cannot menstruate and cannot get pregnant; but can her ovaries produce normal levels of estrogen?
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0answers
22 views

How does the inability to produce vitamin C helped weight gain?

I recently wondered how do dogs cope without vitamin C intake like us. A few Wikipedia pages later, I learned that our dry-nosed ancestors lost about two-thirds of the gene responsible for vitamin C ...
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0answers
20 views

Why is there a weevil on top of a beetle?

A click beetle was walking around and there is a weevil on top of it. Any idea why? I would also like to know the exact species of these insects. !
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0answers
24 views

Can anyone identify this tiny insect?

Very high magnification, size of a very small ant. Found in Menorca, spain
7
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1answer
82 views

What determines the direction in which motor proteins go?

I know that kinesin motor proteins move towards the positive (beta) end of the microtubule, while dyenin motor proteins move towards the negative (alpha) end of the microtubule. However, because the ...
2
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0answers
29 views

Dead flower: Only the veins remain

I've spotted a flower that is dead: It looks like most of the tissue has rotted away and only the veins remain. (Sorry, I don't know the proper name for flower veins). What is the technical term ...
10
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3answers
3k views

Can humans ever directly see a few photons at a time? Can a human see a single photon?

I am not asking the following question: Can humans ever see a photon in the same way we see a chair? My question is: Can a human retina respond to a single photon? If so, how does this happen and why ...
-1
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0answers
23 views

Can someone please explain this paragraph to me? (Picture atached) [on hold]

From Robbins pathologic basis of disease 8th edition.
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0answers
20 views

Is there anything that can tell me precisely how the cross sectional area/radius of a snake changes over length?

I am trying to 3D model a green anaconda which I thought would be simple, then I realized there is actually this very gradual change in thickness from a minimum around its neck to a maximum somewhere ...
-1
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0answers
14 views

Is there a diet or substance that can help reduce the amount of adenosine receptors? [on hold]

I know that as people drink more and more caffeine the body becomes dependent on it and it creates more adenosine receptors. So when one comes off coffee they experience a lot of fatigue because they ...
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0answers
19 views

How to tell the difference between mould and condensed milk and sugar

I have had sweetened condensed milk in the refrigerator for some weeks (or months perhaps?). The can was covered with aluminium foil. I noticed some disk-like artefacts on its surface, which are ...
3
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1answer
67 views

Explain to a layperson how cigarettes smoke might cause cancer

I have a very intelligent friend who is a light smoker, and also a Biology layperson. I wondered whether understanding exactly how cigarettes smoke can cause cancer, might encourage him to smoke less ...
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0answers
17 views

What was the cause of some egg-laying animals evolution to animal-laying?

Is there a specific reason for this evolution? Are no egg-laying animals more complex beings so their embryonic development requires more time and better nutrition conditions?
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0answers
24 views

Why a cow would try to mount on me? [on hold]

I like cows, so I'm always trying to be their friend, giving them some food. But a young one, that seems to be more comfortable with me, was trying, repeatedly to mount on my back. Once she puts its ...
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0answers
9 views

Why do we need somatic stem cell if the cells already undergo mitosis by itself?

What I want to ask is that if the cell have the capability to increase its number by mitosis, then why do we need somatic stem cells?
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0answers
16 views

Species identification please - Bug is a plague for Italian Stone Pines (Pinus Pinea)

They hangout on the top of Pinus pinea and spray a sticky substance all over the place. Size is about 2mm (head and abdomen) may be 4mm including antennae and legs. Could you please help me identify ...
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0answers
10 views

How is Gliclazide SR and Metformin SR a rational fixed dose combination? And should it be taken before or after meals? [on hold]

(Assuming the doses are right) since Gliclazide is a sulfonylurea which should be given before meals and metformin, a biguanide, which should be given after meals, isn't irrational due to different ...
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22 views

Human children with sex abnormalities due to food packaging and river pollutants?

Some news sites are highly vocal about transgender news articles, and also sometimes report hormonal issues due to pollution, like sex-changes in fish and low sperm counts in men. Is there any ...
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0answers
7 views

Sensitivity of fever as an indicator of infectious disease

What is the sensitivity or likelihood ratio of fever as an indicator of an infectious disease? Where can I get the number from?
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0answers
43 views

What causes a tendinopathy to calcify?

I read in this 2012 research paper {1}: The aetiopathogenesis of CT [calcific tendinopathy] is still controversial, but seems to be the result of an active cell-mediated process and a localized ...
-1
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0answers
15 views

What are some examples of group Species where Alpha Males dominate sexual reproduction at greater rates than do chimpanzee alphas?

Chimpanzee alphas are well known to be forced to form coalitions with beta-males who in return are allowed access to females. The alpha still mates the most, but the betas also enjoy significant ...
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0answers
8 views

Non-hair synapsid integument

Anybody noticed that mammal skin (both with hair and without hair) has an irregular scaly pattern when seen up really close? If so, may it have been retained from its pelycosaur and even reptiliomorph ...
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0answers
15 views

Which flower is this?

Found it in a tree in south America.
3
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1answer
32 views

Is it unusual for populations of archaea to be found living inside trees?

The NPR News article and podcast Getting Fire From A Tree Without Burning The Wood begins with A scientist walks up to a cottonwood tree, sticks a hollow tube in the middle and then takes a lighter ...
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0answers
12 views

Multiplex PCR question

Multiplex PCR question - I'm trying to understand Multiplex PCR. From watching this video I'm getting the idea that Multiplex PCR isn't quite the the same principle as qPCR. This seemed to be the only ...
0
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1answer
32 views

Why do people say that smallpox has been eradicated?

I keep reading things like “smallpox has been eradicated” or “there are only two samples of the virus left in existence in a lab somewhere”, but couldn’t there be a bunch of smallpox viruses in an ...
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0answers
24 views

Is it possible to get intoxicated by alcohol through an open wound?

Say you have an open wound in your hand and would dip that hand in an alcoholic beverage. Except for the pain accompanied by getting alcohol in an open wound, would the alcohol also be absorbed ...
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0answers
12 views

For how long can the heart be in asystole and then restart itself?

The medication Adenosine is used for the treatment of some abnormal heart rhythms. However, according to Wikipedia, it can cause asystole for a few seconds: Because of the effects of adenosine on ...
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0answers
31 views

I found this insect. What's the name for it?

It's not moving pretty fast and It's kind of brown underneath
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0answers
11 views

What are the methods to measure the surface density of animals in biology?

In biology there is a rule found by Damuth (https://www.nature.com/articles/290699a0): a relationship between the size of an animal species $l$ and its local abundance (surface density) $N/S$ $$N/S=...
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1answer
19 views

What kind melanin do fair or light skinned black or mixed people have, eumelanin of pheomelanin?

I am doing a study on melanin and conductivity but I cannot find the answer to this question anywhere. Do light complected black or biracial people have eumelanin or pheomelanin? or both?
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8 views

Chickens and dust: Resistance and impacts on pulmonary function

A dusty, dry chicken is a happy chicken. Notably, the concept of dust-bathing, but also the dander they constantly produce which can lead to silicosis in humans where there is overexposure. (Photo: ...
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16 views

How important is getting enough glucose for maximal brain performance / cognition?

I know from many studies that have been done, that resting versus active use of the brain has relatively similar overall energy expenditure levels. On the other hand, however, we know that the brain ...
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0answers
15 views

Are Humans primarily Dominance Hierarchy based, or Egalitarian?

There are some pseudo-scientific discussions regarding a so-called 'alpha' 'beta' model for human relationships. I'm well aware that this model is fatally flawed, but does the same criticism apply to ...
0
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1answer
21 views

Can anyone identify this small shrub? Has white flowers

Small shrub in adelaide south australia garden.
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0answers
11 views

Fluid present inside the brain cavity which provides nourishment to it? [on hold]

Cerebrospinal fluid and the covering is called meninges
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0answers
8 views

Do tendons thickened due to a tendon injury/pathology have the same strength as “normal” tendons?

I read in this 2015 study {1}: This study is the first to show that pathological tendons have sufficient levels of aligned fibrillar structure. Pathological tendons may compensate for areas of ...
0
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1answer
24 views

What kind of bug is in this photo

Wondering what kind of bug this is found outside
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0answers
13 views

Why are isometric contractions more analgesic than isotonic contractions for tendon pain?

According to a randomized clinical trial {1}, isometric contractions are more analgesic than isotonic contractions for tendon pain. The explanation they give is as follows: The antinociceptive ...
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0answers
8 views

At what point in time is rtPCR (qPCR) no longer quantitative?

Regarding qPCR, after how many reaction cycles typically does this procedure become non-quantitative. In other words, how long does it take for the reaction reagents to fall to too low a level? Thank ...
-1
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1answer
52 views

What’s the evolutionary benefit of cats playing with their prey?

I just saw a cat playing and teasing a wounded bird for minutes, and I immediately started to wonder what the evolutionary rationale were. After all, it seems eating the prey as soon as possible ...

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