All Questions

2
votes
1answer
32 views

Spider found in bathroom can’t identify

Found this spider in my bathroom on the wall by the door. Near Houston, TX.
0
votes
0answers
66 views

Has human skin pigmentation adaptation and evolution ceased?

Before asking this question read Why human skin colour disprove natural selection? Does darker skin color make it easier to live under sun? though neither posed the same question or provide the ...
1
vote
0answers
15 views

Diffusion to center of the cell

I have been researching about the ratio between cell membrane surface area and volume. Obviously, when the volume increases faster than the surface area, and up to a certain point, there is ...
-4
votes
0answers
20 views

biology review questions [closed]

After rigorous exercise, severe cramping can be felt in the muscles of the human body. This might also result in muscle tightness and feeling out of breath. These biological responses are an ...
1
vote
1answer
30 views

Is the strength of presynaptic stimulus on the postsynaptic neuron affected more by the dendrites, or the cell body?

Is the strength of presynaptic stimulus on the postsynaptic neuron affected more by the properties of the dendrites & axon terminals, or the cell body & axon? Two years ago I asked a question ...
0
votes
0answers
17 views

Must I HPLC-purify my PCR Primers? (PCR amplicon sequencing with PacBio SMRT )

I would like to order some primers for amplicon sequencing. I am using universal tag primers (unusually long 30-mers recommended by PacBio for SMRT, both F&R) + barcodes (16-mers). The resulting ...
3
votes
0answers
17 views

How do scientists determine the nature of ions passing through a channel/carrier/pump?

The NCE (Sodium Calcium Exchanger) transports 3 Na+ inside the cell for 1 Ca2+ outside. How did we figure this out, and other mechanisms of this sort? If it were a protein, we could tag it with GFP. ...
0
votes
1answer
17 views

Influenza infections and drug design

Why is the neuraminidase used as a target for drugs against influenza virus instead of haemagglutinin? Is there some basic reason that this will make a more effective drug?
3
votes
0answers
33 views

Are there any natural cases of direct translation of DNA to protein? [duplicate]

I'm aware direct translation of DNA to protein (without the need for RNA) has been observed in test-tubes using e-coli. (Reference: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC219759/) I wanted to ...
0
votes
1answer
42 views

What is a fiber? [on hold]

There are many types of fibers, including cellulose fibers composed of long chains of glucose that can be stacked and help build the cell walls of plants, and muscle fibers which contain myofibrils ...
1
vote
1answer
45 views

Has an ape ever drawn/painted something?

I know there are plenty of examples of apes making paintings and drawings, but has there ever been a recorded case of one representing something in their art?
0
votes
0answers
13 views

How would you use PGAl to select for mutants of beta galcodosidase gene (z-) and permease (y-)?

How would you use PGAl to select mutants of beta galcodosidase gene (z-) and permease (y-)? Or do you just use PGAL to grow these mutants after you've isolated the mutant gene and inserted it into a ...
0
votes
0answers
50 views

Why the position of facial organs is the same for almost all animals on Earth?

I was questioning myself on why the position of facial organs (eyes, nose, mouth) is the same for almost all animals on Earth ? Is it because of a common ancestor in evolutionary history ? We don't ...
0
votes
1answer
30 views

What are the technical challenges that are limiting the use or adoption of genetically modified plants or crops? [on hold]

For example, what's preventing scientists from using plants to produce high value materials at large quantities? Or create a single plant with a multitude of nutrients to prevent disease?
-1
votes
1answer
32 views

The organisms of the same species with a different number of chromosomes [on hold]

I am looking for some specific creatures. The organisms of the same species that have different chromosome numbers. Just like male grasshopper (23 chromosomes) and female grasshopper (24 chromosomes). ...
1
vote
0answers
36 views

Spine found on the beach

Can someone please tell me which animal does this spine belong to? I found it today on the beach..
0
votes
0answers
20 views

Where can I find an overview of the most common viruses affecting the different animal species, especially mammals? [on hold]

I was wondering about about the different viruses that affect other animal species and it would be very interesting to see an overview of the most common.
1
vote
0answers
21 views

Projects in DNA Computing [closed]

I am physicist and have recently heard about DNA computing. I want to work in this area. I want your ideas on a "feasible but new project" (maximum time I can put on the project: 6 Months ), I can ...
1
vote
0answers
30 views

human sight at 1000x while looking into the mirror [on hold]

I noticed that my eyeballs have the ability to see in what appears to be 1000x. Setting the conditions: Look into a mirror while in a well lit room. (for me the lighting in my living room as opposed ...
3
votes
1answer
45 views

Animal with “advantageous” trait in a environment where the trait is never utilized (high cold tolerance in mild climate) - natural selection occur?

If you were to put an animal with a certain type of seemingly advantageous "trait" into an environment where the trait was not necessarily needed, ex: Putting an animal with a high tolerance for cold ...
0
votes
1answer
35 views

Question regarding when it's a homoplasy in a phylogenetic tree

If you have 2 organisms that both come directly from the same common ancestor on a phylogenetic tree, and that common ancestor does not have trait "x", is it possible for both of its direct ...
-2
votes
0answers
18 views

A person, in a depressurising airlock on the moon, no spacesuit - what happens? [on hold]

I've been doing research for a film project on what happens to the human body exposed to the vacuum of space (specifically on the moon). However, my specific question hasn't been answered. A person ...
2
votes
0answers
37 views

How many “primary colors” can we smell? [duplicate]

There are many more that three visible wavelength in the visible EM spectrum, and yet we can model any color using only three primary RGB wavelength. Perception of an arbitrary color is equivalent of ...
1
vote
0answers
16 views

What is the most frequently occurring health problem of rodents caused by the usage of pesticides on the agricultural fields in the United States?

For centuries the mankind has used pesticides to protect its crops but within the last century the pesticides have become more artificial and toxic. It is a well known fact that most of the pesticides ...
1
vote
1answer
36 views

Would our body adapt to changes that are not in our DNA?

If a person was to undergo a treatment or surgery at a very young age, that significantly reduced their final height, would the rest of their body adjust to the sudden change? If not; because our arms’...
0
votes
1answer
23 views

Do all cells of a plant contain chloroplasts? [on hold]

If the answer is no, then how do plant cells tell whether they need to keep chloroplasts or not? What kind of signals are used, and how are chloroplasts eliminated?
0
votes
0answers
14 views

Contructing phylogeny from an asymmetric distance matrix?

Is there any method for constructing a phylogenetic tree from a distance matrix which is not symmetric (i.e. the distance from A to be is not the same as the distance from B to A)? The distances I ...
2
votes
1answer
29 views

What is the importance of alkaline condition in biuret test?

Biuret test aims to quantify the amount of protein in a given unknown sample. Biuret agent contains copper sulphate, sodium potassium tartrate and Sodium hydroxide. Coppper ions form the complex of ...
0
votes
1answer
31 views

Can PCR detect phosphorylated protein? [closed]

I'm trying to detect the level transcriptional protein inside cells. However, the cells contained both of this protein that is phosphorylated and not phosphorylated. Can RT-PCR detected the level of ...
0
votes
0answers
29 views

If oxygen would be the same percentage concentration in air. What gas could be replace nitrogen and earth lifeforms still be safe [on hold]

While we need only 20% of oxygen concentration. Can we replace 75% nitrogen with any other gas? What happen if we have 20% O2 but 70% CO2? Or 70% Methane? Or 70% Helium?
0
votes
1answer
29 views

Obtaining protein atomic co-ordinates from dihedral angles

https://en.wikipedia.org/wiki/Dihedral_angle#/media/File:Protein_backbone_PhiPsiOmega_drawing.svg I've been reading on Protein Amino Acid Sequences and their 3D structure. It seems that the 3D ...
0
votes
1answer
39 views

Where does the energy required to turn ADP into ATP come from? [on hold]

My teacher states that in order to convert ADP into ATP, energy from respiration is required. However, I watched a video which states that energy from the son is used to turn ADP into ATP. Which is ...
0
votes
1answer
18 views

qPCR: Accounting for different sample mass when interpreting and comparing Ct

I'm trying to use qPCR to quantify the amount of a specific bacteria species in patient sputum, but I don't really have the option to use consistent quantities of sputum to elute DNA from. The qPCR ...
0
votes
0answers
23 views

Drawbacks of microfluidic assay versus a lateral flow strip

I'm trying to find out the main characteristics that differentiate a microfluidic asssay versis a lateral flow strip and which drawbacks exist. I will focus on paper micro fluidic devices, as they ...
0
votes
0answers
57 views

E.O. Wilson on sociobiology and the origin of morality

Somewhere in E.O Wilson's writing, he discusses how human values are rooted in our nature as a specific kind of animal. He argues that we have an identifiable optimal living place -- a grove at the ...
2
votes
0answers
51 views

Why does the seed of the coconut tree have a liquid in it?

What is the purpose of water in the coconut seed? The reason I ask this is that I was reading about coconut water and all the benefits it has for us Humans. But why does the tree put a liquid in the ...
0
votes
0answers
5 views

Adzuki vs Black Beans vs Soy Nattokinase Content?

Is anyone familiar with whether or not Adzuki Beans, Black Beans or other such fermentation substrates contain similar levels of Nattokinase as would the traditional Japanese Soy Bean Natto? Is there ...
0
votes
0answers
8 views

What is the role of plasminogen used in the preparation of APSAC? (Anisoylated Plasminogen Streptokinase Activator Complex)

What is the role of plasminogen in APSAC, and how is there indirect activation of plasmin through APSAC? Reference https://www.sciencedirect.com/topics/chemistry/fibrinolytic-agent
4
votes
1answer
50 views

Can someone help me to identify what kind of pear is this?

I went to my local groceries supermarket (in Lima, Peru) and found this cheerful looking pear named locally as "pera canela". But I found it weird as the only variety which I'm aware of is Packham's ...
3
votes
0answers
42 views

Are These Oyster Crabs?

I found these crabs at the end of September, 2018. My family was vacationing on the coast of Lopez Island in the Pacific Ocean off of Washington State. I have been trying to figure out what they are ...
1
vote
1answer
66 views

Is reverse senescence/“anti-aging” actually scientifically possible among humans yet?

I have been very interested in this since I myself am interested in reversing my skin's aging/genes/damage/etc. I also am interested in volunteering any future genetic altering of skin quality. ...
0
votes
1answer
41 views

What labs/companies provide comparative genomic analysis? [on hold]

I’m looking for labs/companies that provide comparative genomic analysis between two different species, AND do so for the “paying” public. I am looking to test a hypothesis regarding genetic ...
1
vote
1answer
33 views

What is this plant that spontaneously sprouted in my balcony?

I have a big pot on my balcony that has inhabited many kinds of plants over the years. One spring I got to unexpected sprouts from seeds the size of an apple or orange seed. One survived and grew to ...
2
votes
1answer
34 views

Does anybody knows name of this bird I found in my backyard in India?

I found this bird in my backyard in India. I checked several websites but wasn't able to identify it. Any help would be appreciated.
4
votes
0answers
30 views

What's inside the perinuclear space?

The cell proper contains the cytoplasm in general and the cytosol in particular when referring to the fluid/gel without notable organelle. Once we move inside the nucleus there is the nucleoplasm and ...
1
vote
0answers
30 views

Is there a chemical compound, element or something else that could color the eye lens in purple?

I hope this is a right place to ask this question. I'm writing scifi book, and looking for information whether it is possible for any element, chemical compound, radiation or something else to color ...
0
votes
0answers
30 views

Would there be any particular reason to choose strawberries for this DNA extraction tutorial?

The NileRed video What is DNA and what does it taste like? | Edible Chem shows the extraction of a surprisingly large amount of DNA from some strawberries. At 02:22 ...
1
vote
2answers
51 views

Are spinal nerves myelinated and unmyelinated at the same time?

I was trying to answer this question when I remembered that the somatic axon is myelinated, while both sympathetic and parasympathetic preganglionic axons are also myelinated. Are they only myelinated ...
1
vote
0answers
18 views

Simple and inexpensive astrobiological studies at MDRS

MDRS is a Mars analogue station where volunteers live in Southeast Utah desert for two weeks and perform experiments. Some of these experiments are done in conjunction with public outreach for middle ...
0
votes
0answers
12 views

Chemical composition of human nucleoplasm?

I'm working on a computer visualisation of the inside of a human cell nucleus (embryonic stem cell for now if it makes a difference) and want a good approximation of the chemical composition of the ...

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