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4 views

Are the IRV and ERV equal in amount?

I am reading about Inspiratory Reserve Volume and Expiratory Reserve Volume in my textbook. So my general question is aren't the two terms show the same amount of air ? I would like to tell you why I ...
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0answers
5 views

The position of the macula in comparison to the blind spot

See these two images and compare them: According to the first image, it seems that the macula is in a higher position than the blind spot. But when you look at the second image, there story is ...
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0answers
8 views

What stops myosin during muscle relaxation?

I understand that when the muscle is relaxed tropomyosin blocks myosin binding sites on actin filaments thereby preventing muscle contraction. What I am concerned with however, is whether myosin ...
2
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1answer
22 views

How many times did photosynthesis evolve?

Was it a 1 and done thing? Plants seem to have developed photosynthesis by the endosymbiosis of cyanobacteria. Is the latter the one time in Earth's history that the process independently came about? ...
-1
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0answers
17 views

Can some bacteria be a host to flu virus helping him to survive before it starts attacking humans?

Sorry for very simple question but I am aware that it is very difficult to gather information that is part of somebody education like biochemistry.As I like physics this gave me some interests to this ...
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0answers
14 views

Which fish did modern tetrapods descend from?

Did modern tetrapods descend from Tiktaalik or Ichthyostega? As far as I know, Ichthyostega and Tiktaalik have 10 million years between them, hence the question.
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4 views

Difference between haemocoel and coelom

I am really looking for some EMBRYOLOGICAL PERSPECTIVE . I know about coelom derivation but i want to know how haemocoel is derived and how it is fundamentally different from coelom.
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21 views

Plants with nutritional requirements similar to Cannabis

What are some short plants that preferably could be grown indoor which have similar nutritional requirements (in terms of N-P-K ratio, doses etc.) as Cannabis. The purpose of this is testing a mineral ...
2
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0answers
14 views

What is the arthropod in the picture?

This arthropod has 6 legs and have Chelicerae like spiders. It's about half an inch long. It also looks like a scorpion but I could not find anything like it on the internet. Thank you!
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0answers
22 views

What property of water explains how sweating helps the runner continue running?

My question I have to answer is: A runner picks up pace on a warm day and starts sweating profusely. What property of water explains how sweating helps the runner continue running? The following are ...
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0answers
16 views

'Big ideas' behind constrained selective breeding (optimization)

I'm looking for help in finding the 'big ideas' behind a project I'm beginning and want to make sure I'm not missing anything since I wasn't trained in Biology. My idea is investigating constrained ...
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0answers
40 views

What are these clear sacs all over my house and coming out of my faucet?

I live in el Monte California which is in southern California. I keep finding these egg like sacs on my floor and on everything in my apartment. They are coming out of our water faucet in every room. ...
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0answers
14 views

How much ribose do we eat?

I am wondering how much ribose we ingest as food? Ribose is found in the backbone of DNA and RNA. So, we eat ribose as part of the nucleic acid found in plant and animal foods. While protein, lipid, ...
3
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1answer
52 views

A mutation question from the Indian National Biology Olympiad

DNA was isolated from wild type (Gal+) and mutant (Gal-) E. coli cells and separated by density gradient centrifugation technique. DNA from Gal- strain acquired a lower position. This indicates that ...
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0answers
18 views

Commercial suppliers of cloned vectors?

I am a recent transplant from academia to industry. I would like to follow-up on some experiments in the literature, for which I need cloned plasmids. Addgene of course doesn't (for the most part) ...
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1answer
42 views

Hardy-Weinberg principle

The following paragraph on Wikipedia about the Hardy-Weinberg principle is bothering me. It should be mentioned that the genotype frequencies after the first generation need not equal the genotype ...
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0answers
12 views

What is the rate of bacterial cell death due to viruses on land?

"The rate of viral infection in the oceans stands at 1 × 10^23 infections per second, and these infections remove 20–40% of all bacterial cells each day." - https://www.nature.com/articles/...
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0answers
20 views

What would it take for the cordyceps fungi to successfully infect a human and produce the same results as it does in insects

I know that as of now cordyceps are unable to infect humans due to our immune systems being much too strong to be overcome by it. But how much genetic difference separates a parasite that doesn't ...
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16 views

question on brain dissection

I was dissecting a sheep's brain for my students and one of them asked a question about the corpora quadrigemina he asked why did two of them(the superior colliculus) look more red than the other two ...
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1answer
20 views

How does muscle contract, according to sliding filament theory?

Recently, I was taught in class the sliding filament theory, in which myosin pulls the actin filament inwards. Since Z lines are attached to actin from both sides, it recives pull from both side by ...
-1
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0answers
19 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 of ...
-1
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0answers
28 views

Question about probability of being a heterozygous carrier

A 26-year-old woman of Norwegian descent seeks genetic counseling. Her brother died at age eight of documented cystic fibrosis. Both of their parents are deceased. The woman undergoes DNA testing for ...
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1answer
25 views

Where can I find information on the anatomy or biology of seeds?

Where can I find information on the anatomy or biology of seeds? For example if I want to know the anatomy (some sort of drawing) of a green bean where can I go to find such information? Searching ...
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0answers
31 views

Would a plant survive in a 100% CO2 environment provided it has constant sunlight at all times?

I was looking up "do plants need oxygen" because I was confused and came upon this comment: "Basically, they need to breathe oxygen to survive, like we do. But they can also use the sun ...
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17 views

Aerosolised particle released during autoclaving

During autoclave heat-up, the inside chamber's air is released in order to be displaced by steam. Because of that, many modern autoclaves are equipped with filters at the release outlet. The ...
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1answer
39 views

Is life in the open ocean homogenously spread?

Obviously around land masses or in shallow water where reefs and coral may grow, life is diverse and numerous. But how spread out is sea life in the open ocean (for example, half-way between Hawaii ...
1
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1answer
21 views

Techniques to find out which species are endangered

Most countries have a list of endangered species and international organisations too issue such lists of vulnerable and endangered species. What mathematical or statistical models are those estimates ...
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0answers
14 views

What is more beneficial? [closed]

Which is more healthier/beneficial for the male body being circumcised or uncircumcised? What are the pros/cons for each?
1
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1answer
42 views

Caterpillar identification - found on a coffee plant inside a house

Today, I've found a twig-like caterpillar hanging down from my homegrown coffee plant (which explained why some of the plant's leaves appear to be eaten away). What specie is this insect? It was about ...
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0answers
9 views

What terrestrial Gastropod (specifically snails) has the fastest reproductive rate?

I am looking to do a series of experiments to test the adaptation of snails to different environments (Controlled environments in a lab setting. No organisms would be released into the wild under any ...
-2
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0answers
23 views

Eye clicks like a bottlecap? [closed]

My eyes each click like a bottlecap when I push on it. Feels like cartilage moving, maybe? Here's a video: https://www.youtube.com/watch?v=nKHLCUm7fc4 Anybody know what it is? (And how likely it is ...
-2
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0answers
35 views

Is it true that an animal has a heart if and only if it also has kidneys?

In logic and philosophy of language, the following fact is given as an example of "co-referential" terms (terms referring to the same entity or set of entities, though possibly not having ...
2
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1answer
35 views

Concept of mean systemic filling pressure

Mean circulatory filling pressure (MCFP) in humans was defined by Guyton as "the pressure that would be measured at all points in the entiere circulatory system if the heart were stopped suddenly ...
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0answers
15 views

Why do most negatively charged phospholipids concentrate in the inner leaftlet?

Due to the asymmetry of the lipid membrane, negatively charged phospholipids such as phosphatidylserine, phosphatidylinositol are concentrated in the inner leaflet, creating a different charge ...
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0answers
29 views

How did Rna replicate according to Rna World Hypothesis?

I was studying Rna World Hypothesis in Khan Academy, and there is a line..... The RNA world hypothesis suggests that life on Earth began with a simple RNA molecule that could copy itself without help ...
-3
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0answers
26 views

What is the most awe-inspiring ecology paper of all time? [closed]

If you could choose just one ecology paper, and present it to the whole world, which would you choose and why?
-2
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0answers
40 views

Is the ratio of functional folds to total number of sequences of amino acids of a given length about 1 over 10^74?

In this video Stephen Meyer cites the study of a friend called Douglas Axe who says that the functional sequences of amino acids are extremely rare, about 1 over 10^74 considering all possible ...
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0answers
44 views

Question regarding genetic variance and heritability

According to early studies (performed by Wright) on guinea pig coat color, the total variance in a randomly mating strain was 0.573. The variance in an inbred strain was 0.340. From correlations ...
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0answers
41 views

What does it mean for an enzyme to be “constitutively partially active”?

I am reading a paper* about the link between the enzyme GSK3 and autism, and I have come across the following statement: Unlike many kinases that require a signal to be activated, GSK3 is ...
1
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1answer
71 views

How do mRNAs find ribosomes?

After mRNA is released from the nucleus, the next process is its translation by ribosomes. By what physical, chemical or biochemical process does the mRNA reach the ribosome in the cytoplasm?
-2
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0answers
17 views

Can someone suggest me review articles for conformation analysis of tetrapeptides, pentapeptides and hexapeptides?

I have been trying to understand conformational analysis of tetrapeptides, pentapeptides and hexapeptides. I have found a few research articles on that. But I need to know whether there are any review ...
0
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0answers
30 views

How are disulfide bonds formed? [closed]

I would like to know how disulfide bonds between two cysteine amino acids in a protein are formed. I've searched on the Internet but haven't gotten a clear answer from a reliable source. Does anyone ...
0
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1answer
74 views

Is there any evidence that humans isolated from each other genetically are less able to produce viable offspring?

I would guess that before a new species originates, members of subgroups might have difficulty in interbreeding. Is this possible?
-4
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0answers
40 views

Can we use ultrasound to disable/denature viruses such as COVID

Can we use ultrasound to create a resonant frequency to that of the molecules within the shell of the covid-19 virus and cause them to "shatter" just like a wine glass and an opera singer. I ...
-3
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0answers
24 views

who knows what is this picture? [closed]

Can anyone try to help me identify this picture? Thanks!
3
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1answer
53 views

Do neurons that *don't* fire together unwire?

We all know the classic Hebbian theory, often phrased as "neurons that fire together wire together." I'm curious about how other connections get pruned when two neurons start to fire ...
-5
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0answers
50 views

Are genetic regulatory networks that control embryo formation irreducibly complex? [closed]

Michael Behe says in this video at minute 6:10 that genetic regulatory networks that control genes in embryo formation are irreducibly complex, because genetic regulatory networks are systems that ...
0
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0answers
5 views

Is there any clinical evidence that PRP or MSC injections help spinal arthritis or disc problems? [migrated]

I'm 40 years old, and remember the years in my youth when stem cells were touted as the great new miracle discovery. And like most promising new discoveries I've seen the press quietly died away and ...
0
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0answers
18 views

Are Sweet and sour,gustatory opposite signals

I am sure most people have observed this: Imagine eating a really sour orange ,or gooseberry . Not with water or anything, just orange. So now even after you have finished swallowing the orange ,the ...
0
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1answer
56 views

confusion in types and kingdom system of classification

I am a high school student and I want to ask: is the 'kingdom system' of classification (two-kingdom, three-kingdom etc.) different from artificial or natural classification? I am asking this because ...

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