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What data would Meselson and Stahl have expected if DNA replication was dispersive rather than semiconservative?

What data would Meselson and Stahl have expected if DNA replication was conservative rather than semiconservative? Answer: In the first generation, there would be two bands, one of light density and ...
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0answers
7 views

Wounds with high risk of infection purposefully left open [closed]

I recently read that if a particular wound is at high risk of infection, it may be left open to heal through secondary intention. Why would this be? Why would leaving a wound open ever lower infection ...
2
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0answers
21 views

Do humans have any biological adaptations to eating cooked food?

Humans have been cooking food for at least tens of thousands of years. The presumed reason why cooking took root in nearly all human cultures is that cooked food is easier to digest. However, cooking ...
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0answers
21 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 ...
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0answers
28 views

Calvin cycle- combining three “turns”

In the common Calvin cycle diagram, three cycles are combined to show the production of 1 molecule of G3P. How does the G3P molecule escape from this cycle in one of these turns? Could someone please ...
-2
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0answers
22 views

Is it always clear which part of a chromosome came from the father or mother?

Are the following statements correct? We have 46 chromosomes in 23 pairs. for all the 23 pairs there is always one part originating from the mother and one from the father for all the 23 pairs, it ...
1
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1answer
42 views

Why did the indigenous peoples of northern Asia and America not evolve the same physical characteristics as people of Nordic ancestry?

I was watching DW's documentary on the Arctic the other day, and I was struck by how the indigenous peoples of the far north seemed - visually speaking - to fit into two categories. On the one hand, ...
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0answers
20 views

What is the minimum amount of calories for a person to survive for at least one year?

This is not a hyperbole, I mean literally. I'm programming a simplified model of human metabolism for a game and I need a number here to determine whether or not the player killed his character. In ...
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0answers
22 views

What form of energy does ATP release? [duplicate]

Textbooks and articles often explain that ATP is the "energy currency of the cell" and that it powers processes such as active transport by releasing energy stored in its phosphoanhydride ...
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0answers
15 views

Why does the cyclic flow of electrons in photosynthesis stop the production of oxygen?

Why does the cyclic flow of electrons in photosynthesis stop the production of oxygen? Is there some type of feedback mechanism at work here? The water molecule being split means an oxygen atom and 2 ...
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1answer
28 views

Does alcohol really helps to get substances get faster into the bloodstream? [closed]

I saw the video where Arnold Schwarzenegger cooks some protein cocktail and adds Austrian Schnapps to the mix, saying that it's to make everything get faster to the blood. Is it true or some kind of a ...
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0answers
22 views

The effect of ionic strength on DNA structure ,The effect of CsCl in Meselson–Stahl experiment

What is the effect of relatively high (0.001 to 0.1 $M$) concentrations of electrolytes in a solution containing DNA from a cultured organism? How would this affect the structure of DNA? For instance, ...
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0answers
37 views

How is are Coronavirus vaccines different from each other in terms of how they are made? [closed]

As far as I know there are different ways to produce vaccines: Genetically modify the genes of the virus, so it can't reproduce Damage the genes of the virus, so it can't reproduce Use only a part of ...
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0answers
19 views

How does a bone know the final shape it has to attain (and then maintain)?

How do osteoblasts and osteoclasts share information with each other to maintain this shape?
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0answers
51 views

Why is alpha helix called alpha? [closed]

Why is alpha helix called alpha? Does it have something to do with alpha-amino or alpha-carboxyl groups?
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0answers
31 views

Is there a known efficiency rate for CO2 capture from ambient air in photosynthesising plants?

When humans take in air to their lungs, we capture about 5% of the total quantity of the air as oxygen (which in turn equals about 24% of the available oxygen in the air) Is there an equivalent rate ...
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1answer
83 views

In which reactions of glycolysis is magnesium involved?

I am currently studying the metabolic pathways for biochemistry and I am not quite clear in which reactions of glycolysis magnesium is involved. So I have now found out that magnesium is present in ...
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0answers
15 views

side effects of corona virus vaccine [closed]

Our genome is littered with protoviruses - RNA virus genomes and genome fragments that have gotten integrated into our DNA over millenia. Some of these sequences get expressed in cancers because they ...
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1answer
42 views

After removing the stigma from a flower, specifically the Crocus flower, does it eventually grow back or does the plant die?

After removing the stigma from a flower, specifically the Crocus flower, does it eventually grow back or does the plant die? The reason why I am asking is I am trying to find a way to mass produce ...
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0answers
32 views

Are the veins an organ? [closed]

The vein carries the blood. It comes from the heart. It circulates the blood to other parts of the body.
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25 views

Is there any commercial vector technology platform for boosting recombinant protein production?

I am a novice in biomedical industry. Our team would like to search new vector technology for boosting recombinant protein production. It's difficult to google a firm that provide those plasmids. Dose ...
2
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0answers
45 views

Tree identification in the Caribbean

I live in Puerto Rico and I'm trying to identify this tree and if possible how to kill it since it is infested with termites. https://imgur.com/gallery/Xbmq0g8 Tree Closer view of flowers and leaves. ...
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1answer
64 views

How long to breathe (the equivalent of) all of the atmosphere? [closed]

I have done some rough calculations of how long it might take humanity: approx 80,000 years (that's taking Earth's population as 7.5 billion, 11,000 litres a day of breathing, the weight of 1 litre of ...
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0answers
55 views

Guyton’s Medical Physiology Pg. 16 [closed]

Pg. 16 of Guyton’s Medical Physiology states that The carbohydrate moieties attached to the outer surface of the cell have several important functions: Many of them have a negative electrical charge,...
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0answers
14 views

Does eating in ulcering position fatal directly [closed]

Does eating in ulcering position fatal directly or cause some serious disease like cancer
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0answers
15 views

What is the expected relative RNA concentration level using T-REx Flp-In?

I need to understand the level of RNA over-expression that is normally reached with HEK293 T-REx Flp-In cells. This over-expression system is widely used in PAR-CLIP experiments, which is why I want ...
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0answers
21 views

Is chromatic aberration related to the spectral sensitivity of the human eye and can it cause “relative myopia” and “relative farsightedness”?

in the text below, the authors equate chromatic aberration and the spectral sensitivity of the human eye. Aren't these two very different phenomena though? They also propose a so-called "relative ...
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0answers
22 views

What is the use of the PFK II enzyme in cardiac muscle? [closed]

PFK II (Phosphofructokinase II) is an enzyme that catalyses the reaction of fructose-6-phosphate to fructose-2,6-bisphosphate, using ATP in the process. Fructose-2,6-bisphosphate is an activator of ...
3
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0answers
27 views

Review paper on gene expression regulatory mechanisms

I'm a junior grad student in bioinformatics with CS background. I am involved in a project around discovering gene regulatory networks in some data, which got me curious about the gene expression ...
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0answers
8 views

What parts of a Melocactus plant are technically the stems and leaves?

On a Melocactus plant (e.g. Melocactus intortus), is it true that the spines are technically the leaves, and the succulent tissue including vertical ribs (to which the spines are attached) is the main ...
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0answers
13 views

Why my protein transferred but ladder did not (western blot)?

My protein of interest is about 200Kd, I ran the gel for 35 min at 95V, the protein transferred but the ladder did not, I used dual color ladder(Precision Plus Protein™ Dual Color Standards, 500 µl #...
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8 views

Is the ability to replicate a really necessary condition for life? [closed]

Imagine a single cell that is able to maintain it's existence for long time without making copies of itself now , it's alive without the need for reproduction (I mean a universal definition of life ) ...
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0answers
24 views

Why do humans have one heart the size it is instead of millions of tiny hearts? [closed]

It seems that if we had millions of tiny hearts dispersed throughout the body, it would work better and easier. It seems that theoretically in the right environment, it would be an evolutionary ...
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0answers
30 views

Missense vs Nonsense mutation [closed]

My biology textbook talks about missense mutations as "substitutions that enable the codon to still code for an amino acid, although it might not be the correct one". Their definition of ...
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0answers
16 views

5. Out of purified protein extract and crude protein extract which will have high activity and why? [closed]

Considering the situation within the cell where protein is in interaction with so many other biomolecules, will the protein of interest show the same activity in the cell ,like its extracted and ...
-2
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1answer
37 views

Nucleotide Sequence

So i am from an IT and my sis who is doing medicine asked for my help on this question i have no clue where to start actually. Please Help. So the question is: What is the nucleotide sequence for ...
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0answers
11 views

acid forming foods [duplicate]

many pseudo scientific health websites talk about acid forming foods and alkaline forming foods. They even posit that some acidic foods can be alkaline forming. They say that it is important to know ...
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0answers
6 views

Multiple fission and spore formation

I came across this question today. In the B diagram, zoospores of chlamydomonas is given. Now my doubt is, are the zoospores formed by multiple fission or spore formation? If it is by spore formation, ...
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0answers
23 views

What is Prion? What is Virus? [closed]

I was studying the famous paper by Koshland - 'The seven pillars of life'. Suddenly, a question hit my mind - "Which one of the seven pillars do Prions and Viruses have?". Anyone please ...
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0answers
19 views

can further evolutioin happen to apes if they are isolated to a different environment?like ,can they evlove to a new species under such a condition? [closed]

This question came to my mind after watching the 'planet of the apes' triology. Imagine a group of apes isolated to a different environment,where they have to do tasks that they did not needed to do ...
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0answers
11 views

Does immune cell receptors pass on through mitosis and differentiation? [closed]

My question is that with millions of different antigens that immune cells can identify with their immune receptors, I suppose the genes cannot be responsible to produce every single type of receptors. ...
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0answers
27 views

Can you recognize this larvae that came from a human nose? (probable nasal myiasis?

Those larvae came at least four different times from the nose (inside - from the mucosal) of a 60 year old man from a tropical area in South America. He lives and works in a city with a tropical ...
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1answer
39 views

Why is the mRNA not damaged at -70 C temperature Corona vaccine?

Why is the mRNA not damaged at -70 C temperature Corona vaccine? Need for -70 degree temperature for Corona vaccine I assume that if I, for example, were to freeze, say, a chicken egg after heating to ...
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0answers
33 views

Why is My Yeast Producing CO2 when there is no sugar present? [closed]

So I am doing an investigation into the effect of sucrose concentration on the respiration of yeast. I am measuring the respiration of yeast through calculating the carbon dioxide produced by the ...
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0answers
37 views

Why would convalescent plasma from people who have had COVID-19 become less reliable after they receive the vaccine?

Because the COVID-19 vaccine reliably induces a strong antibody response, I was daydreaming that people getting the vaccine and booster could make a third appointment to donate blood while their ...
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0answers
24 views

Is my understanding of the Bergmann's rule correct? (mass is secondary)

According to Wikipedia, Bergmann's rule applies because animals living in colder areas have greater surface-area-to-volume ratio. If I understand that correctly, the advantage of the bulkier bodies ...
-4
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1answer
42 views

For thisis blood anaerobic? [closed]

I was wondering if anyone knows whether there is free molecular oxygen in the blood? My reasoning would be that oxygen is too reactive to be left alone in the blood, that's why it is transported in a ...
2
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1answer
18 views

What is the minimum water consumption for Arabidopsis and other plants?

I'm working on a project to design a self-contained plant growth environment for germinating and growing plants in space. It's important to know the absolute minimum amount of water and nutrients ...
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0answers
31 views

The Poison of Poison Dart Frogs - Poison or Venom? [duplicate]

I recently took a trip to Costa Rica, and got to see for the first time in my life a poison dart frog (specifically the strawberry poison frog). My guide also showed me a tree that had huge thorn-like ...
2
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1answer
56 views

Sensitivity vs. Limit of Detection of rapid antigen tests

I'm comparing a bunch of SARS-CoV2 rapid antigen tests: Source Columns 4 and 6 list the values for sensitivity and limit of detection (LOD). How come that a test with a several times lower limit of ...

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