1
vote
2answers
34 views

Incomplete Dominance and Probability

I have a follow-up question about an in-lecture question (this is not a homework question). As you can see I have already answered the question and the question is closed to further submissions. ...
1
vote
0answers
20 views

How do we determine a disease's incubation period?

There was a suspected case of Ebola in France, which was later dismissed, since the suspect lastly came into contact with a potentially contaminated person more than 21 days before, which is the ...
0
votes
0answers
23 views

Mechanisms of extracellular stimulation of neurons

When stimulating a group of neurons with an electrode, let's say we put it in a region that contains axons, what is the mechanism by which the axons are stimulated? I've been told electrodes ...
2
votes
1answer
214 views

Neurons with thousands of connections: where are the extra connections coming from?

If every neuron has only one Axon but can can have thousands of (or let's say, even just ten) incoming Axon connections via its dendrites, where are the extra connections coming from? It seems to ...
0
votes
1answer
37 views

Simplest Biological Organism? [duplicate]

What is the simplest biological organism from which a DNA sample has been or could be obtained? Could the resulting DNA be processed and examined in such a way that the resulting information would ...
0
votes
1answer
8 views

What studies are there showing the effectiveness of any substance on canine hypertension?

Searching on http://www.ncbi.nlm.nih.gov I could only find the article titled as "Telmisartan Treatment of Refractory Proteinuria in a Dog".
2
votes
2answers
26 views

What is refractory proteinuria?

I've stumbled upon the article "Telmisartan Treatment of Refractory Proteinuria in a Dog."* What is refractory proteinuria? *Bugbee AC1, Coleman AE, Wang A, Woolcock AD, Brown SA. J Vet Intern Med. ...
4
votes
1answer
32 views

Can anyone identify this caterpillar?

Can anyone identify this caterpillar we found on a cauliflower? This was the only photo we could get of it. Thanks!
3
votes
1answer
38 views

How does electrolarynx work?

I have heard that this is an effective replacement for patients who have a dysfunctional larynx, partly due to cancer. I am curious to know the inner working of this device and why such a robotic ...
0
votes
0answers
13 views

Why does some skin hold perfume longer than others

I was wondering my girlfriend and I used the same perfume for a while and we sprayed the same place. And after a day her skin still smells nice while mine smells normall. Will different types of ...
1
vote
1answer
65 views

Evolution, What would the first plants have been like?

I am curious what the first plants are thought to have been like, what they may have evolved from, and how much earlier (or later) than animals they are thought to have moved to land, if they even ...
1
vote
1answer
38 views

Book-recommendation: Ethology

I am looking for a book that covers the following topics in ethology: Behaviour Sensory filtering, reponsive-ness, sign stimuli, learning and memory, instinct, habituation, conditioning, ...
2
votes
1answer
27 views

Will an 11W UVC lamp kill bacteria?

If I shone a UVC lamp (11W) on something (say for example a plastic phone case) for an hour, would that kill off a noticeable amount of bacteria? That is, if I were to go over the case with a cotton ...
6
votes
0answers
80 views

Calculating additive variance, heritability, and percent of variance explained by additive effects

I've set up some dummy data in R which makes 40 genetically related lines (in this case I'm simulating hemiclones - they share one haploid copy of there genome within a line, thus additive genetic ...
0
votes
0answers
42 views

How much information can a single neuron hold?

I'd like to know how much information (information that can be interpreted into thought by the brain) a single neuron can hold. I understand that memory allocation is a very complex and ...
1
vote
2answers
30 views

Are neural connections one-way?

I'm trying to think about how two neurons communicate, typically shown in pictures as an electric pulse traveling along a long, thin connective tissue. Is this depiction somewhat accurate, and if so, ...
2
votes
0answers
32 views

Does the Jungian notion of collective unconsciousness have any legitimacy in the light of modern neurobiology and epigenetics?

Carl Jung has long ago proposed a rather controversial notion of collective unconsciousness [1, 2, 3], a form of the unconscious (that part of the mind containing memories and impulses of which ...
0
votes
2answers
53 views

If DNA is the input, what is the output? [closed]

How does cells use the DNA inside them? I am looking on DNA as a strip of tape of Turing machine, but with machines its easy. I can read the tape and calculate the behavior of that machine. With cells ...
2
votes
1answer
30 views

Why do our epiphyseal plates close up in our late teens or early twenties?

What causes our epiphyseal plates close up in our late teens or early twenties? I realize that one's genetics plays the main role in this. I assume there is a gene that controls the epiphyseal plates ...
22
votes
3answers
2k views

What limits our healing speed?

Our bodies can repair quite a number of injuries very well. However, it takes time. For larger wounds, complete recovery can last many weeks. Why is this time so long, what is the most important ...
0
votes
1answer
29 views

Help me understand how the thyroid secretes

Please have a look at this close up light microscopic image of a thyroid gland: So I'm guessing the cubic epithelial cells surrounding this big red pulp are the secreting cells...? If so, is the ...
5
votes
2answers
62 views

Why do small organisms make faster movements than big organisms?

I hesitated to ask this question because it seems so obvious and intuitive. However, I am not able to explain this tendency. Background It seems to me that small organisms make faster movements than ...
4
votes
1answer
59 views

How did people who were living far from the sea obtain iodine during the Middle Ages?

Knowing that today iodine comes either from fish products or (artificially) enriched table salt, how did people who lived far from the sea survive before (especially during the the Middle Ages)? Edit ...
0
votes
0answers
8 views

Fe(II) and Fe(III) transport from rhizosphere across plasmamembrane

Does the graminaceous plants have passive uptake of Fe(II) via a passive Fe(II)-transporter enzyme? Or it it only dicots and non-graminaceous plants that have the Fe(II)-transporter enzyme? Also, can ...
2
votes
1answer
30 views

Can the sensory neuron network and the motor neuron network be considered separate networks?

I am reading up on the nervous system using wikipedia and trying to interpret one infographic on this page: I've always thought of the human nervous system as a singular network of neurons. This ...
1
vote
1answer
38 views

All or nothing phenomena

We know that an action potential is produced by an active cell membrane when the stimulus reaches a certain threshold. When it does, an action potential fires, and when it doesn't, nothing happens. ...
0
votes
1answer
24 views

Could someone link me a picture of interstitial fluid?

Doing a quick Google image search doesn't return much and I'm curious to know what it looks like. Am I correct when I say, since it contains primarily lymph I'd expect it to be clear ? Thanks.
5
votes
2answers
34 views

How do you visualize RNA on a gel?

I have run an in vitro transcription reaction and produced some RNA of a single species and definite size. I would like to visualize it to check if the reaction worked. Can I do this on an agarose ...
6
votes
1answer
175 views

Ebola: cleaning of protective suit

As far as I know, in developed countries protection suits used by people who treat patients with Ebola are disposed of after a shift. From a rather ambitious costume last year, I still have a hazmat ...
1
vote
0answers
17 views

Does drinking spoiled milk that has been boiled upset the GI tract?

With water, boiling will kill harmful pathogens. Does this also hold true for milk ? If it does not, what in the milk will continue to cause gatrointestinal distress ? Shouldn't boiling kill the ...
3
votes
0answers
69 views

What are the psychodelic effects of (stellar) anise and how many people are affected?

Backstory: My girlfriend reacts heavily to chocolate and drinks containing stellar anise, in a way that seems comparable to psychodelic drugs. After consuming it, it takes approximately five minutes ...
3
votes
1answer
36 views

What equation to compare protein isoforms in a Western Blot?

The protein isoforms I am interested in comparing appear as distinct bands on the gel I have already run. I have an Excel sheet with optical density measurements I obtained using ImageJ; it looks ...
4
votes
2answers
167 views

Why proteinase K doesn't degrade itself?

Can anyone tell me why proteinase K doesn't degrade itself? If possible please provide me the source.
2
votes
1answer
54 views

How do animals handle light refraction in different media?

For a human, when diving underwater, everything is blurry because of the water's different refractive index compared to that of air, which we are accustomed to. How do animals, like turtles, seals or ...
-2
votes
0answers
33 views

What's the difference between meth and mdma so that the effect are vastly different?

One is methylene deoxy methampetamine. The other is methampetamine. They both contains methamphetamine. So why MDMA is far saver than meth?
2
votes
2answers
49 views

Are the DNA codon mappings arbitrary?

I am a Biology novice so I apologize in advance if I state anything incorrectly.... My question is, are the DNA codon mappings arbitrary? I understand that the DNA code is made up of codons which ...
2
votes
0answers
24 views

What is the allelic frequency at mutation-selection-drift equilibrium?

At mutation-selection equilibrium the expected frequency $f$ of a given locus is $$f ≈ \frac{\mu}{s\cdot h}$$ , where $\mu$ is the mutation rate, $s$ is the selection coefficient and $h$ is the ...
0
votes
0answers
14 views

Which trees/shrubs provide most food for wildlife in northeastern US?

Let's say I have an opportunity to plant a couple trees or shrubs in my backyard that is adjacent to a small 20 acre area of woodland surrounded by urban development. There are animals like rabbits, ...
1
vote
1answer
24 views

How does fluorouracil inhibit pyrimidine synthesis?

I was reading in my pharmacology textbook about fluorouracil, and my book mentioned that fluorouracil is an antimetabolite whose function is to inhibit pyrimidine synthesis. However, I was curious to ...
6
votes
2answers
65 views

Just how dangerous is ethidium bromide?

A common precaution for preparing EtBr-agarose gels is to add EtBr only after the gel solution has cooled somewhat, because EtBr is a dangerous mutagen. Supposedly, adding it to a hot liquid allows ...
8
votes
1answer
187 views

How do I put on a labcoat?

Let's assume I am wearing a labcoat for two reasons: Prevent the various bacteria, proteins, skin cells and substances on my clothes and my skin from contaminating my experiments. Prevent various ...
0
votes
0answers
11 views

Open Source Variant Caller comparable to GATK Haplotype Caller?

Is there a Variant Caller comparable algorithmically and in performance to GATK Haplotype Caller but Open Source Compliant (non-restrictive use)?
0
votes
1answer
28 views

What's the evolutionary reason behind decussation?

A bunch of stuff in the human nervous system decussates. Optical information inputs from the eyes cross over in the optical chiasm. Multiple sensory and motor pathways cross-over before ascending the ...
0
votes
1answer
35 views

Fruit colour related to the dissolving of pectin

What does the dissolving of pectin have to do with the colour of a fruit?
4
votes
1answer
173 views

How many RNA-binding proteins can simultaneously bind on a single mRNA?

Typically, how many RNA-binding proteins can simultaneously bind to a single mRNA? Or said differently, how many "binding sites" does an mRNA have? What order of magnitude? I am interested in RNA ...
1
vote
0answers
64 views

Are humans the only living species that have the concept of exercise? [closed]

Humans have the concept of working out and exercising to keep themselves healthy. I have not heard of any other species that does the same, but I am just being ignorant. Are humans the only living ...
8
votes
1answer
225 views

What's the difference between growing cells in culture and cloning them?

The wikipedia page on Hela cells refers to George Gey being able "to isolate one specific cell, multiply it, and start a cell line." Later it says, "In 1955 HeLa cells were the first human cells ...
3
votes
1answer
54 views

About sharks and how they find fish

Other than olfactory senses do sharks use some kind of sense that uses electromagnetic waves? Is this similar to an electric eel? I saw a book with the cover statement 'Sharks never get cancer'. IS ...
4
votes
2answers
55 views

Is chloroplasts per cell indicative of the photosynthetic power of a plant?

Plant-A has on average N chloroplasts per cell. Plant-B has on average M chloroplasts per cell. If N > M, is plant-A more efficient in turning carbon dioxide into oxygen? Also, is it possible to see ...
1
vote
1answer
31 views

PSI-BLAST website algorithm parameters

http://blast.ncbi.nlm.nih.gov/Blast.cgi In this website, when I want to apply the psi-blast algorithm on a sequence, under the section of algorithm parameters , what does PSI-BLAST threshold mean? ...

15 30 50 per page