2
votes
1answer
158 views

Why do I breathe out of BOTH nostrils?

After reading the question why do I only breathe out of one nostril I realized that breathing out of both isn't common. I have always breathed out of both, and when I get a stuffy nose, or a runny ...
3
votes
1answer
101 views

Integration of several environmental signals

I am looking for examples of different functions that are good fit to how signals are computed in order to respond to the environment. Let's make my question more copmrehensible with an example... ...
3
votes
1answer
45 views

Help identify this awesome climbing plant with velcro like stem

I got this plant sprouting in my window box this spring. Starting from a single seed, it has grown into an impressive array of branching climbing vines, reaching 6 feet tall. The stem turned red as it ...
3
votes
2answers
80 views

Name of This Black and White Dove

I spotted this dove in a park. It was foraging among Rock Doves, Seagulls, Ibises and a few others. It appears similar to Pied Rock Doves, but I am not certain if this is correct. Any idea what ...
4
votes
1answer
47 views

Oxidation means inflamation?

All right, I was reading article on nutrition, that focussed on content analysis of pastry-like food product for kids. I have to say that I am not sure this article would pass the imaginary smell ...
4
votes
1answer
76 views

How do animals lose heat?

I remember being told as a child that dogs stick their tongue out to stay cool, because they can't sweat like us. This made sense to me. But only a couple of days ago I suddenly thought: What about ...
2
votes
1answer
14 views

Effect of extremely hard water on marine life?

When researching water quality standards, I found that a minimum and maximum was set for water hardness. Several sources also state that water can in fact be too hard. The question is how does hard ...
2
votes
2answers
42 views

Why is gastric lavage considered to be helpful only if a patient comes to a hospital within 1 hour of a toxic ingestion?

Why is gastric lavage considered to be helpful only if a patient comes to a hospital within 1 hour of a toxic ingestion? How severe would the effects be if a patient came to the hospital after the ...
1
vote
1answer
40 views

Influence of temperature on protein binding and decay rates

For computer modeling purposes, I am looking for some referenced quantitative measurements of the effect(s) of temperature on the dynamic of biochemical reactions. Question In particular, my ...
2
votes
2answers
40 views

Simulating Drug Entry in Protein and binding?

Is there any simulation protocol or paper which can simulate the dynamics of drug entry and interaction with the target protein?
2
votes
1answer
25 views

Do river sharks (genus Glyphis) have reduced rectal glands for salt removal?

Do river sharks of the genus Glyphis have reduced or absent rectal glands for salt removal?   The rectal gland of marine sharks removes excess salts to maintain osmotic balance (Oguri 1964).  In ...
0
votes
0answers
17 views

What Type Of Goggles Offer Better Protection For Airborne Pathogens

For airborne pathogens, be it Chickenpox, Influenza, Measles, Smallpox and Tuberculosis, which offers better protection against aerosolized particulates, splashes, etc? Non-vented, Vented (regular), ...
2
votes
1answer
54 views

What is the point of DNA sequencing?

This is a very very basic question. I've looked at methods such as chromosome sequencing and shotgun sequencing. Wikipedia says that: ...
3
votes
1answer
32 views

Why do we use DNA sequencing methods such as shotgun?

I am learning about DNA cloning for the first time. What I understand is that, in order to clone DNA, we break-up the original gene into shreds. Then try to piece it back together. Why exactly do we ...
0
votes
0answers
18 views

Highest Pressure Human Body Can Survive In?

One design for underwater human inhabited environments is to have equal pressure between the surrounding water and the submerged habitat, thus allowing a section of the floor to be open to the water ...
0
votes
0answers
24 views

muscle contractions cell biology questions?

An increase in cAMP/PKA always results in muscle contractions. In smooth muscle contraction, calcium binds to troponin. Stimulation of adrenergic beta receptors on smooth muscles cause muscle ...
5
votes
1answer
26 views

Components of the concept of Developmental Noise?

Developmental noise is a concept that correspond to the amount of possible phenotypic variance of a given genotype in a given environment. Intrinsic noise (aka Cellular noise) is a component of ...
0
votes
0answers
18 views

Results of fermenting bakers yeast, Sugar and different categories of fruit peels

Based on this recipe I made three Jars of the fermented solution each containing: Papaya Peels Lemon+ Pomegranate peels Pineapple Peels In addition to above recipe I added 1 large tbsp of ...
2
votes
0answers
19 views

Do the eggs for larger litters come from the same meiosis events, or different ones?

There are some species of animals that give birth to more than one pup at a time. In these species, are the fertilized eggs all from one or a limited group of meiosis processes, or are they from ...
3
votes
2answers
49 views

Why shouldn't you defibrillate a flat line (asystole)?

In most popular medical dramas, when a patient is in cardiac arrest and has a flatline the doctors use a defibrillator to 'shock their heart into rhythm'. I know that actually, the proper protocol is ...
1
vote
1answer
46 views

What is the use of shampoo; is it for the hair or for the scalp?

Apologies for the confusing question; I did not know how to better ask it. I was doing a search on wikipedia when I found this statement. Wikipedia's entry on hair states; "The hair that is ...
3
votes
1answer
40 views

Hair loss in a submarine?

Biologically, how critical is hair loss on a submarine? What is the prolonged exposure of a navy officer going to do to that person, say over a year or even more?
0
votes
1answer
12 views

What are the molecular mechanisms behind tachyphylaxis (downregulation of receptors in response to an agonist?)

Anyone know of a good source which explains this? Or is this still an open question? This wikipedia article describes some molecular biology behind morphine tolerance, but it sounds like its newer ...
11
votes
2answers
4k views

Why doesn't water enter my body through my anus or genitals when swimming?

So when we swim, we can make water not enter through our nose and mouth, simply by holding our breath. However, the mouth and the nose aren't the only cavities. What about the anus and the genitals? ...
0
votes
0answers
9 views

VMD set molecule as top using script

I have 10 molecules in VMD main screen and I was wondering if there is a script command to change what molecule is the top. For example, molecule ...
7
votes
3answers
3k views

Does our DNA change during our lives?

As far as I know, DNA is the construction protocol of all organisms on Earth. Does it change when influenced by time and environment (physical laws)? As parents with schizophrenia are more likely to ...
13
votes
4answers
43k views

Why is DNA replication performed in the 5' to 3' direction?

DNA replication goes in the 5' to 3' direction because DNA polymerase acts on the 3'-OH of the existing strand for adding free nucleotides. Is there any biochemical reason why all organisms evolved to ...
1
vote
1answer
39 views

Why is lead dangerous? [closed]

Lead is known to be bad for your health for a long time, but I can't find a explanation why is it so. In school they teach that heavy metals are poisonous, and they are trapped inside our bodies. I ...
1
vote
1answer
30 views

How is the rate of transcription influenced by temperature?

How is the rate of transcription influenced by temperature? More precisely, I am looking for an article who quantitatively measured the rate of transcription of an "average gene" and show how this ...
2
votes
1answer
22 views

How does one determine intracellular concentration?

The TL;DR version Is there a fast way to determine what the cell environment of a particular cell (E.g RBC) is? (in terms of solute/ionic concentration) I'm not sure if the question belongs here, ...
0
votes
1answer
40 views

Nucleotide sequence for STRING protein sequence

I have protein sequences from STRING database: The amino acid sequence files are like this: 4932.Q0010 (Saccharomyces cerevisiae) ...
17
votes
3answers
820 views

Why are there no organisms with metal body parts, like weapons, bones, and armour? (Or are there?)

Reading this question, Why are there no wheeled animals?, I wondered why no organisms seem to make use of the tensile and other strengths of metal, as we do in metal tools and constructions. I am ...
1
vote
1answer
38 views

Can mosquitos bite in self-defense?

When chasing away wasps or bees thee is a danger of them stinging us in self-defense. Can a similar danger arise when chasing away a mosquito which is otherwise not hungry? I understand that ...
2
votes
0answers
25 views

How much time is required between repeated exposures to sun to prevent sunburn [closed]

After being in the sun, how much 'rest' is required before you can expose yourself again? e.g. from Wikipedia: Sunburn can occur in less than 15 minutes So if you were in a place where sunburn ...
0
votes
0answers
26 views

What is the protein used in retrotransposon in human?

I was wondering what protein is used in human for reversely transcribing the RNA intermediate to DNA in human being. and another Q is that what kind of cell produce this protein and when will it be ...
1
vote
0answers
30 views

Why is an inflammation in eye and brain more devastating and can lead to loss of organ function compared to other organ like liver etc.?

Recently I have learnt something about immunoprivileged site and I wonder why these sites like eye would prefer tolerating these antigens that sabotages the normal function of these to having ...
3
votes
1answer
48 views

Why do birds move their heads abruptly?

When we humans look around, we pan smoothly from one side to the other. Birds on the other hand seem to point their head in one direction for a while, then abruptly point their head in another ...
4
votes
2answers
4k views

Why do we sweat after drinking water and running?

Why do we sweat after running? Also we sweat sometime after drinking lots of water. Why it is so? Can someone please enlighten me in this regard?
1
vote
0answers
11 views

How much Melatonin does the Human Body release in the course of a Night?

I have found multiple sources giving slightly different indications as to the peak Melatonin production in humans. It appears that children between ages 5 and 10 may achieve peak Melatonin/blood ...
2
votes
1answer
464 views

Can Naegleria fowleri enter through your ear?

Is it possible to get infected with the amoeba, Naegleria fowleri, through your ears, or is the nose the only way it can enter to cause infection? How commonly is it found in your stool as well?
5
votes
2answers
75 views

Confused at what is happening with these action potentials

Ok so for a bit of a background, I am doing a science project looking at the action potentials of the earthworm. I anaesthatized the worms then hooked them up to a spiker box ...
4
votes
1answer
50 views

Influence of temperature on transcription, protein binding and decay rates

I am the kind of biologist who doesn't know much about molecular genetics and about the dynamic of biochemical reactions. Question My question concerns the influence of temperature on the dynamic of ...
1
vote
0answers
31 views

Fire Ant Behavior

I've noticed for the past few weeks that near a small fire ant nest near my house there will be a new concentrated "large" pile of dead fire ants every few days. I went and checked out the pile and ...
4
votes
2answers
143 views

Why sleep? No, actually, why wake?

I was just reading the sleep threads, and I wondered, why is the body so constructed so that sleep is necessary? (Is it just a design error?) But then, how do things come to be awake at all? How did ...
1
vote
0answers
20 views

Segregation Analysis for predicting age-specific cancer risk

I am relatively new to the world of genetics research and have been tasked with presenting to my lab the potential value of a paper that uses Complex Segregation Analysis for a risk analysis. The hope ...
2
votes
1answer
23 views

Transcription rate expressed in microarray per hour

This article gives measurement of transcription rate and the unit they're using is microarray per hour. For example, at 27°C the average expression of their genes is 236.1 microarray per hour (page ...
1
vote
0answers
23 views

Difference between thylakoids and lamellae in a chloroplast?

I'm slightly confused as to the difference between thylakoids and lamellae. My understanding was that thylakoids are 'discs' that are stacked into grana and there is a membrane between the grana ...
2
votes
2answers
199 views

Why does a blood test show ethanol when no alcohol was consumed?

Why would ethanol show up in a blood test if a person had not been drinking alcohol in many years. What are other reasons for showing ethanol?
0
votes
0answers
22 views

Is there sugar secreted into blood even after complete digestions in healthy humans? What about dogs?

Suppose we're feeding a high GI food to a person and that the digestion lasts five hours. Does the body secrete sugar into the blood afterwards? What about in diabetic dogs and humans? Update: I am ...
1
vote
2answers
828 views

NaCl role in CTAB - DNA complex in DNA extraction

I have a question about the role of NaCl in the DNA extraction process. So for NaCl concentrations under 0.5M, CTAB and DNA molecules can create complexes. In those concentrations, proteins and other ...

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