0
votes
0answers
11 views

About Hermaphrodite Mitochondrial Inheritance

From the textbook I've learnt that in general mitochondria are inherited maternally. However if the cross is between hermaphrodites (e.g. in C.elegans), where, in most cases, then should the ...
2
votes
0answers
27 views

Can you suggest me some books/articles about how female birds indicate receptivity to copulation? [closed]

Where can I find informations about the topic? I need to find some examples. I also really need this particular information: I know that many female mammals display lordosis behavior that indicate ...
4
votes
0answers
44 views

Did the Great Oxygenation Event also cause a mass extinction?

Its usually assumed that the Great Oxidation Event around 2.3 bya caused a great extinction of anaerobic life on earth. But as I was reading Nick Lane's book, ...
0
votes
0answers
11 views

Pressure produced by blowing with mouth

I need some figures on the pressure humans are capable blowing with their mouth with zero flow. I only need very approximate figures. I'm guessing around 500mm of water? I haven't got a tube handy to ...
0
votes
0answers
12 views

How can I apply any machine learning model/classifier on miRNA seq data?

I recently got micro RNA sequencing data from the TCGA. I am currently trying to early detect Mesothelioma. How is microRNA seq data different from microRNA expression data? MicroRNA expression ...
0
votes
0answers
11 views

Bence-Jones proteins in urine on heat

The preliminary test for proteinuria is precipitation/turbidity on heat due to denaturation. This turbidity should not disappear when 10% acetic acid is added - to differentiate from phosphates. ...
5
votes
0answers
27 views

Why do emperor penguins breed during the antarctic winter

No land animal, and I think no sea animals either, stay in the antarctic during winter - except for one: The emperor penguin, which does not only stay there, but its prolonged stay involves 4 months ...
2
votes
1answer
24 views

Do we know a complete list of nutrients that humans must ingest to live?

When the people who are making "nutritionally complete" foods like Soylent are developing their product, how do they know that they've covered all their bases? You need to have protein, carbohydrates, ...
1
vote
1answer
105 views

Is metastatic cancer always lethal if uncured?

Can matastases spread in different parts of the body of an animal suffering from cancer grow in a limited way, such as not to cause much more harm that a benignant tumor in those parts of the body ...
4
votes
2answers
76 views

Is there a term for when a detrimental gene can be positively selected for because of linkage to a very fit gene?

Let's say that some piece of DNA would be subject to extreme negative selection if it were independently inherited, but it is very closely linked to an extraordinarily fit gene, and so the complex it ...
1
vote
0answers
60 views

Does reproduction cause aging ? Is aging just a strategy to increase reproductive success in all organisms? [closed]

Background for why I am asking this: I read a book—modern biological theory and experiments on celibacy— which uses life history theory to imply that reproduction is the reason why organisms grow ...
0
votes
2answers
47 views

Are there genes in sex chromosomes that determine facial features?

My friends and I were bored enough to try out this activity. Picture a teenage boy in your mind. From this picture, remove any accessories (glasses, piercings, etc.), moustache or beard, then ...
-1
votes
0answers
42 views

Why do electrophoresis gel boxes only have 1d wire electrodes and not a 2d 'mesh' as used in clarity?

Since the DNA and protein are electrophoresed in a 2D plane (along one dimension, the length of the gel), I am surprised that a 1D wire electrode is used for anode and cathode, and not a 2D mesh-like ...
0
votes
0answers
36 views

CRISPR Cas9 most updated paper protocol

I am collecting literature to start a new project on CRISPR Cas9 gene editing. I must put together a protocol to start asap. I am intending to use the following paper as guidance: "Genome ...
1
vote
1answer
26 views

A question regarding trichomes in plants

Trichomes in general are features of xerophytic leaves, which reduce water loss by evaporation by trapping water vapor and increasing humidity (as a result lowering the water potential gradient). BUT ...
1
vote
1answer
24 views

Respiration of an animal cell media

I want to do respiration process of an animal cell media in laboratory environment. I don't entirely sure how to supply it with Oxygen to the process because it is a gas, but not a liquid.
12
votes
3answers
111 views

How does the brain immediately know when one's thirst has been quenched?

The question struck me the other day when I drank a glass of water. I understand that there are at least two conditions under which the brain signals thirst: extracellular thirst, when there's not ...
1
vote
1answer
18 views

What will happen to a neuron if I suddenly remove the pump but not the leaky Na+ and K+ channels?

K+ is more abundant inside the cell and thus has a propensity to move outwards. It has an equilibrium potential of -80 mV. Na+ is more abundant extracellularly and thus has a propensity to move ...
3
votes
1answer
19 views

What is the Cordil that Edward Topsell describes?

In his "History of four-footed beasts and serpents", Edward Topsell describes a "serpent" called Cordil. Since he lists everything that crawls on the ground as a serpent, regardless of being a ...
1
vote
0answers
34 views

Why do some men have patchy beards?

Why do some men have patchy beards? Or more specifically, why would some hair follicles lack sufficient 5-alpha reductase while others nearby don't when their genetic code is identical and they are ...
1
vote
0answers
25 views

Number of pair of chromosomes in sex cells of human [closed]

Just wondering how many pair of chromosomes in sex cells of human? How many single chromosomes in sex cells of human? Thanks for your help! It is said the chromosomes in sex cells are haploid?
1
vote
1answer
37 views

What is a “noninvasive” biomarker for a disease? [closed]

What is a "noninvasive" biomarker for a disease? I know what a biomarker is, but what makes it noninvasive?
3
votes
1answer
37 views

Large black caterpillar, cocoon, moth - Los Angeles

This is my first visit here, probably the first of many, since I have many species to identify! The first is a regular resident of my back yard in the Los Angeles neighborhood of Mt. Washington. It's ...
2
votes
2answers
36 views

Separation of smaller DNA fragments and larger fragments without using gel electrophoresis?

For an upcoming experiment I would have two kinds of DNA fragments in a sample after a particular reaction step: First there would be fragments of a length of approx. 170 bps and then there would be ...
2
votes
1answer
42 views

What's the proper term for “brain waves” read from an EEG?

An EEG records the electrical activity of the brain. An EEG shows voltage differences as a function of time and shows what have become known as "brain waves". Is there a scientific/technical ...
1
vote
1answer
62 views

What is the name of this beautiful white trees?

I found this beautiful white trees in an unknown video.
1
vote
1answer
76 views

Which are the last cells of the human body to die?

When somebody dies, which are the last surviving cells of his/her body? Those of hair, nails, or some other obscure but resilient cells? Shedding light on why and how they are so vital might boost ...
0
votes
0answers
14 views

Optimum gibson assembly overlap length

Does anyone know the optimum length of overlap your primers should have to your vector for gibson assembly. Most manufacturers say to do at least 20 bp on both side but don't give a maximum. Sometimes ...
0
votes
1answer
46 views

Assuming if height was fully determined genetically, what would be the concordance between monozygotic pairs?

I fully understand the differences between monozygotic and dyzogtic twin pairings, but I wondered how I could put into words the reasons why the concordance would be very high. Derived from same ...
-1
votes
0answers
18 views

Could humans metabolize gasoline? [duplicate]

Gasoline is mostly made of organic compounds/fats/oils. Food is also made mostly of similar organic compounds. Therefore, would humans be able to metabolize gasoline, or some of its components, for ...
2
votes
3answers
46 views

What is the role of TATA box in transcriptional regulation? [closed]

I know what is the TATA box, but I wish to know whether it has specific roles in transcriptional regulation.
2
votes
1answer
28 views

Question about Enzyme Inhibition in relation to Aspirin

I've been trying to learn a bit more about pharmacology, so bear with my ignorance. In short, I see that aspirin (in part) works by inhibiting cycloxygenase isoenzymes and that this inhibiting is ...
0
votes
0answers
17 views

Did Cyanobacteria alone create the oxygen in Earth's atmosphere 3.5 billion years ago?

In other words, is the conveniently close-to-Californian-Universities pools of such representative of accepted theory. With the immediate follow-up question, when did the much more impressive amount ...
2
votes
0answers
15 views

What is a rough estimate of CO₂ saturation for high-yield or high growth rate plants?

Naturally, plants have individual photosynthesis capacities, but it would still be interesting to get a general picture of CO2 saturation levels for some common cultures. Where lies the optimal yield, ...
3
votes
0answers
7 views

At which voltage will the conductance decrease due to the narrow pore in a voltage-gated potassium channel?

If you have a voltage-gated potassium channel that do not inactivate, at which voltage would you see decrease in ion conductance related to the narrow path in the pore? With that said I know that in ...
2
votes
0answers
29 views

Can sleep be replaced by chemical supliments? [closed]

If adenosine makes a person sleepy to rebuild chemicals in the brain, than is it possible to inhibit adenosine and externally produce and inject the needed chemicals?
0
votes
2answers
37 views

What kind of fish are these?

This should be pretty easy. We have a tropical fish tank, and among a few other species we have an adult pair of these guys. The female is a live-bearer, and seems to be giving birth to two young at a ...
1
vote
1answer
16 views

TRANSFAC Matrix.dat retrieve count matrix using BA or CC field

In the TRANSFAC Matrix.dat most of the motifs are given in the form of count matrix, but a few of them are given as some kind of frequency matrix. Those aren't ordinary PWMs because rows don't sum to ...
0
votes
1answer
12 views

iPSC in drug discovery

Pluripotent stem cells are very popular and lots of research has been conducted to use these cells as a tool for drug discovery. My question is how many years would it theoretically safe is we could ...
3
votes
2answers
134 views

Genetic mutations and new alleles

Amongst silent, nonsense and missense genetic mutations, is the latter the only one that leads to the creation of new alleles? If we define alleles as a specific form of a gene, and a gene as a ...
0
votes
0answers
11 views

Are there any reliable studies about colors and emotions? [migrated]

It is rather common knowledge that black and yellow indicate danger, blue trust, green and red appetite, warm colors warmth, and cool colors cold. Please, recommend me any studies or literature about ...
0
votes
0answers
16 views

Do all parasitic worms lack tango receptors on their skin?

I read that the parasitic nematodes lack tango receptors on the surface of their body. Is this true for all the parasitic worms?
0
votes
0answers
17 views

Is it legal to send animals for near spaceflight research? [migrated]

For biology purposes, is it legal or not, like using crickets and mouse as subjects to be sent near space (Upper Stratosphere) High Altitude Balloon
1
vote
1answer
36 views

Can you replace glucose with glycerol in cell media?

In order to feed an animal cell in process called Respiration, can I replace Glucose with Glycerol? The Equation bellow: Glycerol + Oxygen -> Water + Carbon Oxide
1
vote
0answers
29 views

What a cell needs to survive? [closed]

I'm looking specifically at animal cells. I'm not sure if it needs only Glucose and Oxygen for Aerobic respiration.
0
votes
0answers
31 views

If your atlas is out of alignment, will the rest of your spine be out as well?

I just found out about this association called Nucca. Basically, they are a chiropractic association - their whole idea is that if your atlas is out of alignment, then the rest of your spine is also ...
-2
votes
0answers
37 views

Can large snakes eat a person?

I was wondering if you could tell me whether it is possible for a very large snake like a python or an anaconda to eat a person, i.e., an adult or young male. If it did manage to swallow them what ...
1
vote
1answer
32 views

What is a “homologous pair” of chromosomes in cross joining or cross over?

I never understand if the chromatids attached at the centromere is a homologous pair, or the male and female chromosomes?
0
votes
2answers
63 views

What is meant by “Expression” of Non-Coding RNA?

I was having a look at lncRNAdb and its help says: The ENCODE project gene annotation list, GENCODE, has predicted that the human genome contains 14,470 lncRNAs whereas only a small proportion of ...
8
votes
4answers
936 views

Why would lethal genes evolve?

I've been reading through 'The Selfish Gene' by Dawkins. At a few places in the book he states that incest is damaging because it would give a very high chance of lethal recessive genes becoming ...

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