1
vote
0answers
48 views

Why do humans stop growing?

Humans stop growing after reaching a certain height, right? Could you explain the reason, why humans stop growing? Many people say that people stop growing around the age of 21-25, so for what exact ...
2
votes
0answers
11 views

How precisely can we sense temperature?

We have thermoreceptors, thus we can sense temperature (both warm and cold). I'm interested in the sensitivity of our hermoreceptors - what is the smallest temperature difference that we can sense? I ...
1
vote
1answer
8 views

Pasteurization and Bioavailability of Antioxidants in Beet Juice

What are the effects of pasteurization on the antioxidants found in beet juice ? Does the process render most of the beneficial nutrients (betaine) useless and make them unable for the body to process ...
1
vote
1answer
22 views

Which sources can I use to study botany and horticulture?

I refer with this question to those among you who have a strong background and work in fields like: botanics, horticulture, dendrology, etc. I would like to start building a solid preparation, both ...
12
votes
1answer
157 views

Effect of pupil responses on the electroretinogram

The electroretinogram (ERG) is generally considered to reflect the retinal processing of a light stimulus, typically a photoreceptor response followed by secondary neuronal activity. I am wondering ...
2
votes
0answers
9 views

Why do humans have the scratch reflex? Are there any benefits of it from the evolutionary point of view?

I've been wondering about this for some time, and I can't come to an answer... Everybody keeps telling that scratching one's own skin is bad. It damages the epidermis, creates the hazard of malicious ...
0
votes
0answers
26 views

What is the impact of stress on the human body? [on hold]

Can stress trigger any changes in the human body? I'd like to know more about things less commonly known than, for example: sweating and tiredness. What are the long term risks of chronic stress? Do ...
4
votes
1answer
38 views

Help with STRING database data

I'm working with data downloaded from STRING database (string-db.org) for protein-protein interactions. My idea is to compare the topology of connections of the same protein on different organisms. ...
40
votes
4answers
2k views

Why are there no wheeled animals?

In physics, "almost everything is already discovered, and all that remains is to fill a few unimportant holes." (See Jolly.) Therefore, on Physics SE, people are veering off into different directions: ...
2
votes
1answer
16 views

SNPs in DNase hypersensitive and histone marks sites

I am investigating a role of SNPs in DNase hypersensitive sites and in the DNA regions of histone marks and have some questions about it. SNPs in DNase hypersensitive sites might mean that those SNPs ...
1
vote
1answer
60 views

What is the relationship between radiation and evolution?

There is always a certain amount of background radiation present, for example due to ionizing radiation from the sun and other stars. Also certain materials like granite may emit relatively large ...
0
votes
0answers
20 views

Why do legs twitch non-stop? [on hold]

Why do my legs keep twitching restlessly? People told me that it's because someone is nervous, however, my legs never stop twitching, no matter what am I doing, no matter if I am relaxed or stressed, ...
7
votes
2answers
237 views

Does taking a shower have the same effect on muscles as warming up?

When playing sports, coaches and trainers are always very clear that it is necessary to warm up and stretch. But sometimes athletes sometimes want to get an extra stretch in and don't want to go ...
0
votes
0answers
11 views

Measuring a plants electric activity any instructions where to place electrodes?

I would like to measure a plants electric activity, I've looked online to find out where to place the electrodes and what type of electrodes to use but they seem to very wildly. Any ideas? At the ...
5
votes
2answers
50 views

What features cause mechano sensory adaptation?

In relation to mechanoreceptors (e.g. pacinian corpuscles), what stops a constant stimulus from producing action potentials? I understand that adaption is used to filter out stimuli that aren't ...
9
votes
2answers
6k views

Why is PEG important for efficient yeast transformation?

One way to do an yeast transformation is by using lithium acetate, a single-stranded carrier DNA, and PEG (1). I was wondering why is the polyethylene glycol important for the efficient ...
1
vote
1answer
19 views

Repair of cloning vector nicks digested with antarctic phosphatase and ligated with T4 enzyme

The vector product obtained by ligation between a vector previously digested with antarctic phosphatase lacks 5' phosphate groups. T4 ligase can ligate it to an insert with complementary sticky ends ...
1
vote
1answer
12 views

Ways to cause membrane damage to microalgae and yeast?

I am researching a way to monitor the membrane damage of cells. To do that I fist have to have reference points, namely, cells with damaged membranes. I am working with Dunalliela, Hematococcus (both ...
0
votes
0answers
16 views

Do you have more information about anti-idiotype antibody? [on hold]

According to the following two related passages, structural data at the atomic level have emerged for anti-idiotypic antibodies from X-ray diffraction studies in recent years. These studies provided ...
2
votes
1answer
46 views

Do all kind of unicellular asexual reproductions let mutations happen, resulting in evolution?

I know about fission, an unicellular asexual reproduction method, where the mother cell splits into two daughter cells. Does this kind of asexual reproductions let mutations happen, leading to much ...
3
votes
1answer
133 views

How does temperature influence the rate of protein degradation?

For computer modeling purposes, I am looking for some referenced quantitative measurements of the effect(s) of temperature on biochemical reactions. Question In particular, my question is: How does ...
0
votes
0answers
30 views

Ask for most simple DNA rule [on hold]

I'm a programmer and I work on a DNA related project, and I need to write some simple example about what we can learn from DNA. Could you please give me a simple DNA rule, a name is okay with me ...
4
votes
2answers
43 views

Why proteins are not visible on my membrane after ponceau staining?

I have a problem in western blot that I can't resolve by myself. When I am use to add 100 microgram of proteins for each sample but after running and transfer its impossible to me to see bands of ...
8
votes
2answers
102 views

Should we induce fever to assist healing?

I am currently reading "The Fundamentals of Anatomy Physiology" 10th edition, and have found it an incredibly interesting book. I have just been reading about the lymphatic system, and the various ...
2
votes
1answer
56 views

Is it possible that a set of functionally related proteins in a pathway fulfill different functions? [on hold]

Could it be that a given pathway of enzymes (or proteins in general) may fulfill different purposes in a cell by for shifting partners? Say protein A activates B, B activates C and C has a specific ...
3
votes
2answers
206 views

What happens in the synapse when cocaine administration occurs in the human brain

As far as i know when you accept cocaine in your blood some cocaine molecules reach some synapses in your brain and fill some Reuptake tunnels preventing the cell to simply "do not know that fired ...
2
votes
0answers
12 views

Which is the guideline to choose a molecular target to identify vertebrate hosts from arthropod bloodmeals?

There are some molecular targets to identify vertebrate hosts from arthropod bloodmeals including the Cyt b gene and the COI gene. Which are the standards or characteristics that I have to bear in ...
2
votes
1answer
28 views

Differences between Gradualism and Uniformitarianism

From what I understand, gradualism is the idea that small changes affect species over time. Uniformitarianism argues that the same processes that occurred in the past are the same as those in the ...
9
votes
3answers
4k views

Why can all animals swim in water without learning to swim but humans cannot?

I had a question since I was a child. I was always curious about the fact that all animals can swim in water. They don't need any training or to learn swimming. But humans need to learn to swim. Why ? ...
5
votes
1answer
88 views
+50

Splice in with CRISPR/Cas

I need to splice a gene into a human cell genome, with highest rate possible. I mean, doesn't really matter where the gene enters, nor does it matter if some cells die as a result of this. CRISPR ...
4
votes
1answer
73 views

Mitotic crossover happens in G1?

I was reading this article in wikipedia and came across this : It has been suggested that recombination takes place during G1, when the DNA is in its 2-strand phase, and replicated during DNA ...
4
votes
1answer
68 views

Understanding recombination scoring in family pedigrees

I am having some problems understanding recombination, and I am not sure what element I am missing here. This figure is an example from my text book. The pedigree belongs to a family with an autosomal ...
3
votes
1answer
15 views

Cationic lipid mediated transfection optimization for 150mm dishes

I need to optimize a transfection protocol to transiently express a plasmid encoding a chimera of eyfp attached to the c term of a Golgi apparatus signaling molecule) in hela cells and hepg2 cells ...
4
votes
1answer
53 views

MHC restricted peptide

What is an MHC restricted peptide? I got this definition from wikipaedia, but cannot exactly extract what the phrase MHC restricted peptide means. MHC-restricted antigen recognition, or MHC ...
3
votes
1answer
46 views

How is excretion of metabolic wastes from a cell related to its size?

As with anything that is taking place within a cell, the metabolic waste too must be proportional to the size of the cell. In particular the surface area to volume ratio. But how is the waste ...
4
votes
1answer
111 views

How do animals handle light refraction in different media?

For a human, when diving underwater, everything is blurry because of the water's different refractive index compared to that of air, which we are accustomed to. How do animals, like turtles, seals or ...
4
votes
2answers
54 views

Evolution theory - roses spikes - being more bulgy doesn't give you advantage

I've seen spike, huge spike. And I thought that development of such spikes could be contrary to the evolution theory. Being „little more” spiky doesn’t give you any advantage... So those ...
1
vote
1answer
157 views

Crossing white eyed Drosophila with sepia eye

So, I'm doing some drosophila experiments with my high schoolers and I had really poor production of wild type individuals for doing the experiment resulting in not enough to cross with everyone... I ...
-3
votes
0answers
22 views
12
votes
1answer
87 views
+300

Help identifying what this is in Crayfish gills?

this is my first time posting here. I was in my Zoology lab doing a dissection on a Crayfish when I noticed these hairlike structures within the gills. They were very "snappy" and fine, and would ...
1
vote
1answer
54 views

What exactly is neuroplasticity, and can it be demonstrated with a simple experiment?

As far as I know, neuroplasticity is about restoring brain functions by moving some functions to other still functional. Neuroplasticity is more prominent in children than in adults. What are other ...
6
votes
1answer
42 views

Why do mitochondria fuse together?

Contrary to all of the textbook images of mitochondria that I have seen over the years, I had just learned that the mitochondria within a cell form a dynamic branching network along microtubule ...
4
votes
0answers
25 views

Why do apples taste sweeter at the bottom?

Sometimes when eating an apple, I notice that the bottom (blossom) end of the apple has a lot more sweetness and flavour to it, whereas the top half (stem) is often more watery, crispier and feels ...
8
votes
1answer
520 views

Flower (?) identification (Shanghai, China March 2015)

As per the title. The plant appears to have fleshy protrusions resembling flowers growing out of its stem (although I am unable to identify them as such). Anyone has an idea on the identity of ...
1
vote
2answers
54 views

What is a good source that will help me classify protists?

I am a 15 year old that enjoys looking at the micro world. The only issue that I have is that I can't find a good online source that will help me classify the name of the micro organism that I'm ...
-3
votes
0answers
37 views

The IQ of a frog may change after it is thawed? [duplicate]

The real useful part is link in question What effects does being cryogenically frozen have on a person's body? And even that question was not well answered. If you ...
7
votes
2answers
45 views

Naming convention of miRNAs

I'm trying to understand naming convention of miRNAs. I've found the wikipedia article about it nomenclature Based on it, I try to figure out what is hsa-let-7a. As far as I understood, hsa refers to ...
0
votes
0answers
26 views

Are mind and body really independent when falling asleep?

I have been researching dreaming for many years and often see a theory posed that the mind and body are actually independent in regards to the sleep process. In other words, the body doesn't know for ...
5
votes
1answer
29 views

Nucleosome wrapping direction

Does anyone know which direction the nucleosomes are wrapped? I wonder: Relative to the B-DNA double helix twist direction (right-hand) Relative to the neighbor nucleosomes. Do they alternate to ...
4
votes
1answer
106 views

Are there any mutagens that can undo the mutations they cause?

I was reading a section from my textbook about tautomeric shifts, and it seems to suggest that there are some mutagens that can be directly responsible for the phenomenon. The section is mainly ...

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