All Questions

1
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0answers
16 views

How is the right amount of nucleotides synthesised during homologous recombination?

I'm reading about homologous recombination in the context of double-strand break repair. It seems like the trick is that around the break, homologous recombination uses a template duplex to generate ...
-1
votes
1answer
27 views

Identifying statistically significant gene rich and gene poor regions

I am just wondering If there any adapted way of Identifying significant gene rich and gene poor regions in each chromosome for a given genome say mm10?
2
votes
1answer
48 views

Why is xylem a tissue and not an organ?

My textbook "CGP AS-Level Biology Exam Board: Edexcel Complete Revision & Practice" says xylem is a tissue. Then I read from this website that "[Xylem's] major components include xylem parenchyma,...
0
votes
1answer
24 views

Why are lipids not considered polymers? [duplicate]

I'm struggling to understand why lipids are not considered polymers—if the fatty acid part of lipids consist of repeating units, wouldn't lipids be polymers?
1
vote
0answers
28 views

Do primates have genetic predisposition to dominance hierarchies [on hold]

I’m looking for some evidence to prove (or disprove) that primates are genetically predisposed to dominance hierarchies. I would appreciate any pointers/references to scientific literature. PS: The ...
1
vote
4answers
82 views

Does sex-chromosomes exist in all the cells in a human body? [on hold]

Each cell of a human body contains 46 chromosomes. So every cell must contain a pair of sex-chromosome. Is it true? Then a cell of a male and a cell of a female are always different and never be the ...
1
vote
1answer
16 views

GEN file format, SNPs and alleles

I have a few questions I can't seem to get a straight answer to, regarding the .gen file format and also biology in general. The .gen file format specifies SNPs for individuals. Since each SNP has ...
0
votes
2answers
40 views

If bacteria with recombinant DNA molecules do not survive in gene cloning, how they can be grown into a colony after being isolated?

This is as far as my understanding of gene cloning goes. Let's say that the plasimd (vector) in the bacteria contains an ampicillin resistence gene. Through restriction enzymes, the ampicillin ...
8
votes
2answers
1k views

Where did Neanderthals and Denisovan Man come from?

Neanderthals, Denisovans and our species (Homo sapiens) are commonly cited as closely related subspecies, even interbreeding with each other. Yet our species theoretically didn't migrate out of Africa ...
3
votes
1answer
25 views

Can the heart generate its own rhythm independent to the SAN?

My textbook and a revision guide, which I believe is a reinterpretation of the textbook, state that: The SAN initiates waves of excitation that usually override the myogenic action of the cardiac ...
0
votes
1answer
14 views

Use of bacteriophages against viral infections [on hold]

I know that bacteriophages kill cell by essentially blowing up, and I also know that viruses are difficult to treat because they aren’t necessarily alive. Could bacteriophages be modified to attack ...
-1
votes
1answer
20 views

What are the brain structures directly on top of the brain stem?

I have been trying to learn the anatomy of the brain, and some information on their functions, through an iPad app called 3D Brain. Whilst going through the different parts, I have noticed that one ...
3
votes
0answers
17 views

Is this a venomous (poisonous) spider?

Today I found a spider in my home that I have never seen before. I live in Karachi, Pakistan. I want to know which spider is this and if it is venomous and danger for me or my family ?? Is this ...
1
vote
0answers
24 views

Why some eggs are bile stained?

Why eggs of some helminths( Diphyllobothrium latum, Trichuris trichiura, Ascaris lumbricoides etc) are stained with bile while eggs of other helminths( Hymenolepis nana, Enterobius vermicularis etc.) ...
4
votes
1answer
63 views

Can you identify this insect?

I found this insect in my own courtyard in the city of Pamplona, Navarre, Spain; during mid-February. My courtyard is never directly exposed to sunlight and is always cold, poorly lit and humid. It ...
1
vote
0answers
6 views

Nerve/muscle fibre depolarizaitonand repolarization balance

if continously sodium is pumped in during depolarization and pottasium is pumped out during repolarization, eventually there will more sodium and less sodium inside. How the does the fibre/cell return ...
3
votes
1answer
34 views

Do you know which is this small flower in Asturias?

Was located in the Turón valley on Mieres, Asturias, Spain (https://goo.gl/maps/BMwyfWtiSdw). Found it at 900 meters of altitude. The plant is just about 8 cm high maybe. All the ones I've found were ...
-3
votes
0answers
13 views

What would happen if carbon dioxide does not escapes a Cell? [on hold]

CO2 escapes cell through diffusion, but what would happen if it does not escapes from the cell?
1
vote
0answers
17 views

What bird is this (found on Alice Spring Desert Park on Australia)?

I was reviewing photographs of the animals we found on our trip to Australia during the past September and I cannot find what is the bird in the picture. It was found inside Alice Springs Desert Park, ...
3
votes
1answer
25 views

Can you name this plant that likes shadow on Asturias?

Was located in the Turón valley on Mieres, Asturias, Spain (https://goo.gl/maps/BMwyfWtiSdw). Usually, I find them on shadowy, not too illuminated parts, although I'm not sure if that's important or ...
0
votes
0answers
10 views

Calories burned for each activity - is numbers true? [on hold]

I always wonder if we burn 90 calories for running a 1 km distance and the same we’ll get by consuming 5 tea spoons of sugar, How is it possible energy from that little amount of matter able to push a ...
1
vote
0answers
19 views

What is the name of the wrinkles occurring in people's lips? [on hold]

I was wondering if there is a name for the wrinkles occurring in people's lips. Just curious.
-1
votes
0answers
8 views

electrical excitation of a skeletal muscle [on hold]

Does anyone have any idea why the mechanism of this coupling has been difficult to determine? It is an end of a chapter question in my human physiology textbook.
0
votes
0answers
14 views

Blast wrong, RNA seq

I am looking for a Virus, which have 3 RNA segments in my NGS data (Cucumber mosaic Virus). I have trimmed adapters to my ngs data and I have convert my fastq files in fasta files which I have done ...
0
votes
0answers
3 views

Sugested literature for herpetology

I'm a mathametician who always have liked biology and especially reptiles. I'm here because I wanted to ask you for advice in to which books should I read to start with herpetology and what should I ...
3
votes
1answer
53 views

Fruit identification - What is this green long fruit?

I found this fruit in the South of France, but I have no Idea what it is. It's a green, hard fruit. I tried to cut it to see the inside (on the following pictures). It fell from a big tree, but I don'...
2
votes
0answers
17 views

Flying insects on olive tree

They may be responsible for why the leaves are drying out. Location is in West Europe. Their size may be 0.5 cm to 1 cm
1
vote
1answer
31 views

Can nervous disorders be cured? Will enough research be the answer? [on hold]

I have searched every nook of the internet and I couldn't find a clear and to-the-point answer. Well my story is that I am a young BSc student who wants to do research on neurological conditions ...
2
votes
1answer
30 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
65 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
19 views

biology review questions [on hold]

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
16 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
16 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
12 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
29 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
30 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
43 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 ...

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