0
votes
0answers
2 views

Rattlesnakes developing stronger venom

I have heard that rattlesnakes are developing stronger venoms causing more people each year to die from rattlesnake bites. But why would a snake that is already very venomous need to develop stronger ...
0
votes
0answers
4 views

Monarch mimic other than viceroy?

I once saw a butterfly that looked a lot like a monarch. It had orange wings with a black edge and white spots on the edge. It also had 1 black spot in the middle of each wing. So I knew it wasn't a ...
1
vote
0answers
11 views

Why does nature use a 4-level system (DNA) to encode information?

First, I am not a biologist, so this question might be naive: All of our information processing and storing is based on 2-level logic, bits with 0 and 1. Now, DNA stores the information in a 4-level ...
0
votes
0answers
24 views

Evolution of a Population

Scientists observe a newly established population of sexually reproducing plants growing on the shore of a small island. An observable trait of the plant has two possible phenotypes. It is determined ...
1
vote
1answer
120 views

Hardy-Weinberg Equilibrium Question

I have four questions concerning H-W Equilibrium: (i) In a population of mice, the presence of black spots is the result of a homozygous recessive condition. If the frequency of the allele for this ...
2
votes
0answers
13 views

PAGE gel in EtBr

I have been using TBE-PAGE gel to see small fragments of DNA by post-staining that means gel is stained with EtBr after electrophoresis. Someone told me that you can add EtBr before polymerizing ...
2
votes
0answers
12 views

What is the distribution of the number of heterozygotes in finite populations?

Consider a bi-allelic locus with alleles A and a. We denote the frequency of the A allele by ...
1
vote
0answers
12 views

Link together all alike DNA sequences

Is it possible to take a DNA solution and link together every alike fragment of DNA in the solution?
2
votes
0answers
26 views

How do we know Denisovans had 46 Chromosomes

What allows sequencers to conclude that Denisovans had 46 chromosomes rather than merely knowing Denisovans had the crossover material arranged in 48 or say 44 chromosomes? See ...
1
vote
2answers
18 views

Is it possible to amplify every single piece of DNA through PCR?

Is there a way to perform non-specific PCR amplification for the purpose of amplifying every piece of DNA present?
2
votes
0answers
7 views

How is pain induced by blunt and sharp objects?

Normally, when something touch you, you won't feel pain. With a great force "touching" you, you will feel pain. However, if something that is spiky makes contact with you, you will feel pain. So, how ...
0
votes
0answers
7 views

Extending a small fragment of DNA

Is there a way to extend a small fragment of DNA, say 150 bp, by making copies of itself and attaching each copy of that small fragment to the end of that 150 bp sequence? For example, I want a 1kbp+ ...
0
votes
0answers
8 views

White blood cell transfusion

Some patient who have low White blood cells need WBC Transfusion do resist infections. What is interesting, doesn't transfused WBCs cause temporary autoimmune disease ? Like recognising patients ...
3
votes
0answers
11 views

What techniques can be used to link environmental conditions to crop yield?

Im interested in how we can determine what are the optimal conditions for crops and how deviations from these optimal conditions affect yield. In the literature I have found two main approaches and I ...
1
vote
0answers
12 views

Role of microvilli in cell volume regulation

Does the presence of microvilli on a cell's surface ensure that it's more resistant to cell swelling or lysis in a hypotonic solution, as compared to a normal cell?
0
votes
2answers
40 views

Junk DNA and “random” mutations [on hold]

I'm somewhat irritated by "mutation" generally being described as a fully random factor in evolution: pure randomness does not seem like something that can survive in a long evolutionary process. And ...
0
votes
0answers
9 views

Whole Genome Sequencing and B Chromosomes

Do whole genome sequencing techniques detect B chromosomes if such chromosomes are present? My understanding is as follows: How the DNA material in a B Chromosome is mapped depends on the reference ...
0
votes
0answers
6 views

Why is dopamine considered both an excitatory and Inhibitory neurotransmitter? [duplicate]

To me it seems the one allows flow and the other prevents flow. How does dopamine do both?
0
votes
2answers
19 views

Whole Genome Sequencing and Chromosome Counts

In general, do standard whole genome sequencing techniques rely more on known chromosome counts, independently arrive at chromosome counts, and/or not directly address issues such as base number, ...
0
votes
0answers
9 views

Why I don't feel pain when I press the skin on my knee and elbow?

Does the muscle on our knee and elbow have some speciality ? Why are we unable to feel any sort of pain when I pinch it ? I also did it with my Mom and Dad and result was same .
3
votes
1answer
25 views

What species is this?

We found this on a beach in the Bay of Lannion, Brittany, France. What is it? About 6 cm long.
2
votes
2answers
20 views

Chemotherapy - Hair loss

Chemotherapy kills cancer cells by targeting rapidly growing cells. That is why patients are loosing hair as well. My question is, why chemo related hair loss is temporary ? The docs say it is ...
1
vote
1answer
40 views

What were the symptoms of Phineas Gage after suffering his brain injury?

Phineas Gage was a construction worker who suffered a head injury due to an explosion at a construction site. A metal rod was pushed up his cheek and through his head. I have heard he demonstrated ...
0
votes
0answers
9 views

How plants absorb water? [on hold]

I would like to know how plants absorb water for their roots. ( I mean the way they do it ).
-1
votes
1answer
25 views

During Orgasm, Do females ejaculates like males? [on hold]

Acc to Bio-Science, males get ejaculates when they reach orgasm, so what about females? do they get ejaculation like males?
2
votes
2answers
61 views

Is there a way to prevent an HIV infection after exposure to HIV infected Blood?

If a person is accidentally injected with blood from an HIV+ person, is there a treatment option that can keep the person from developing an HIV infection?
0
votes
0answers
22 views

What the definition of a flanking residue? [on hold]

What the definition of a flanking residue? How do you define whether an amino acid is flanking or not? What are the environmental or physiochemical conditions in which a residue is considered to be ...
0
votes
1answer
20 views

What are the changes to semen if it is put stationarily in the atmosphere for a period of time? [on hold]

If I put it in a test tube for, say a week, what are the physical and chemical changes? In addition, will the fructose inside be lost or broken down?
1
vote
0answers
34 views

Can our eyes see faster? [on hold]

There are some animals that react faster than normal rate (like flies, etc). I guess it's because they can see faster than other animals and humans, as if time passes slower for them. I think some ...
1
vote
2answers
42 views

How do neurons receive the ions needed for creating electrical pulses?

I really wonder how ions are transported into the brain and the neurons for creating electrical potentials - how do ions get from our digestive system to the neurons? Or are the ions just freely ...
-3
votes
0answers
29 views

Why not frozen evolution? [on hold]

I'm not sure if you have heard of it. It is a theory proposed by the best Czech evolutionary biologist (even though it disproves the selfish gene and darwinism for sexual species :), but it is not ...
0
votes
0answers
23 views

If humans are 10cm taller than 200 years ago, then how can it be that we are “not much different” from humans 70000 years ago? [on hold]

According to Yuval Noah Harari in his book "Sapiens: A Brief History of Humankind" we today are not much different from the post-cognitive-revolution Homo Sapiens which lived 70000 years ago. But then ...
6
votes
4answers
110 views

Are all pathogens parasites?

If parasites are organisms that feed on other living organisms, then aren't all pathogens parasites? I've emphasised on 'feed' because I guess the pathogens just eat us (i.e. take nutrients to ...
1
vote
1answer
14 views

How do roots absorb water instead of presence of waxy - material suberin in the form of casparian strips on the wall of endodermis?

I found that in the endodermis, the tangential and radial walls have deposition of the waxy, and hence water-impermeable, material suberin in the form of casparian strips. The endodermis comes before ...
3
votes
0answers
57 views

Why are lips covered with specialized skin?

I found out some interesting facts while studying our lips: They are covered in glabrous skin, while most of the skin surface is hairy; The outermost layer (stratum corneum) of the skin is far ...
1
vote
0answers
36 views

Differing Flow Cytometry Genome Sizes and Sexual Mating Implies Differing Chromosome Counts

Do the fundamental principles of genetics strongly suggest the following is a derived conjecture? If 2 flowering plant species A and B have widely differing genome size (at a minimum a 50% ...
3
votes
2answers
304 views

Can dietary monosodium glutamate intake induce restlestness?

The question is all in the title. More context: I like phở soup. I have noticed that I get restless after eating the phở soup at some restaurants. The effects are similar to the ones resulting from ...
1
vote
1answer
24 views

What is the antagonist of epinephrine?

Norepinephrine and epinephrine have similar stimulant properties on the nervous system and the body. I was wondering which hormone is the antagonist of epinephrine?
0
votes
1answer
23 views

Marker validation using transcriptome and genomic sequences derived from a single cell

I conducted a SSR marker analysis using bioinformatic tool on some RNA-seq data of human tissues. Now, my supervisor believed that we have to validate these SSR on a transcriptomic and genomic ...
1
vote
0answers
14 views

Why is 2 sexes in an organism so common? [duplicate]

Sorry if this is a super simple question, but why do a lot of species have only 2 sexes? Some species just have 1 sex, but I've never heard of an organism having 3 sexes, for example. 3 sexes seems ...
-1
votes
0answers
13 views

Does anyone have some references on using metal halide lamps in a greenhouse? [migrated]

I am looking for some references to use Metal Halide Lamp in green house. Is there some one can recommend me the specification (also the function), brand and the supplier (if possible)?. Many thanks ...
2
votes
1answer
18 views

What is pQTL and why do we need eQTL?

eQTLs are genomic loci that contribute to variation in expression levels of mRNAs (wikipedia). There is data out there that shows that ~60% of the time, the amount of mRNA in a cell is directly ...
3
votes
1answer
25 views

Can sexual selection operate in temperature dependent sex determining organisms?

Or more broadly, are distinct forms of genetic inheritance (ie. sex chromosomes) needed for sexual selection? My thinking was that since there are no sex determining loci, there could not be linkage ...
1
vote
1answer
21 views

genes map to eQTL/pQTL

Of the 192 target genes, 79 map to a significant eQTL or pQTL in at least one dietary condition. is the line for a paper "Multilayered Genetic and Omics Dissection of Mitochondrial Activity in ...
0
votes
0answers
11 views

Size of the glycan chain in a glycosylated protein

I would like to know where I can found the (experimental/estimated) distribution of glycans sizes attached to proteins.
1
vote
1answer
29 views

How do we call a region of low carrying capacity?

I am looking for a convenient word to define a region of the landscape where the local carrying capacity (population size) for a given species is low but different from zero. The species is still ...
1
vote
2answers
25 views

How do plants get carbon?

How do plants get carbon? From air or soil? How is it different for aquatic plants and algae? According to https://en.wikipedia.org/wiki/Soil_organic_matter soil has 3.3 times the size of the ...
0
votes
0answers
30 views

Do we all dream “every” night?

I had an argument with my brother and he claims that he doesn't dream every night ie when he dreams he always remember and if not he hadn't dreamt at all. I'm under the impression that all humans ...
0
votes
0answers
11 views

Nicotine and plants [duplicate]

I hear that nicotine, produced by Nicotiana tabacum, is poisonous to the plant itself, which is why it accumulates the nicotine in the central cell vacuole. If so, why is nicotine produced in the ...
0
votes
0answers
12 views

How do non-dimorphic birds distinguish sex of possible partners/rivals?

Some birds, such as my pet Pionus chalcopterus, are not sexually dimorphic. People can't tell them apart, and even trained avian vets are not 100% certain with an inspection probing the vent. I ...

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