3
votes
1answer
590 views

Family tree for edible plants?

I am looking for a family tree for plants, particularly veg / herbs / fruit. Something similar to: If it could be slightly less technical than all the Latin ...
3
votes
3answers
613 views

Bioinformatics tool for “pairwise alignment” of complementary sequences?

I'm currently working on some ribozyme binding, and I'm looking for a tool that will essentially analyze the regions of the degree of complementarity in two sequences in order to extrapolate ...
3
votes
2answers
30k views

Why Do Healing Wounds Feel Warmer To The Touch?

I fell over on my bicycle trying to avoid running over a rattlesnake, and ended up badly skinning my knee. It immediately began to bleed, but soon clotted. It has been 2 days now and it has formed a ...
3
votes
3answers
1k views

Is there variation of AT/CG ratio along species?

Chargaff's rules say that the number of Adenine of the number of Thymine in a genome are equal (nA=nT) and similarly nC=nG. This makes obvious sense knowing that C binds to G and A to T. But what ...
3
votes
1answer
657 views

What hair color will result in someone inheriting both blond and ginger genes?

Both the genes for blond hair and ginger hair are recessive, so they need both parents to give the same gene for it to take affect. What happens when a person has 1 copy of a recessive gene and ...
3
votes
3answers
6k views

Separating DNA Fragments by Gel Electrophoresis. Are all the strands for one size the same?

My apologies if my question is too basic, and please point me to a more appropriate forum. I am reading the textbook "Essential Cell Biology" by Alberts et al, and am consulting other sources as ...
3
votes
2answers
115 views

Why don't we form immunity to some infections?

I read another question, and its answers, about how vaccines work, but I don't see there, and and don't understand, why some infections can, seemingly, not be immunized against at all. For example, ...
3
votes
1answer
136 views

Where are -HCl supplements absorbed in the human digestive system?

I see that quite a lot of drugs and dietary supplements sold in the USA have -HCl(hydrochloride) added to their name. For example pyridoxine hydrochloride for Vitamin B6. I'm interested in knowing ...
3
votes
1answer
676 views

Are there any multi-cellular organisms out there that do not sleep?

Looking around I see animals - ants, bees, birds, lizards, roaches all the way up to humans appear during a part of the day and not other parts. I would guess there is a sleep/recovery cycle involved. ...
3
votes
3answers
295 views

What Defines a Food as Edible?

With many foods today containing chemicals, agents and preservatives etc... What biological criteria must a new food and its constituent components satisfy biologically, to be defined as edible? ...
3
votes
1answer
2k views

Does cockroach lay eggs in human flesh when they “bite”?

Recently, i have "bite" by cockroach, not only the "bitten" area red and swallowing, and more specificly, it have a big hole in that area, when i clean it with hydrogen peroxide solution, something is ...
3
votes
2answers
131 views

What risk to DNA does long-term exposure to low-dose radiation pose?

A new study from MIT scientists suggests that long-term exposure to low-radiation poses no risk of DNA damage for mice (it is also important to note that mice are unusually susceptible to cancer). So ...
3
votes
2answers
130 views

How “exactly” is Rabies transmitted?

Context: I know a person which has developed a sort of "phobia" with respect to touching things that has (even the slighest) chance of being in contact with something that can transmit rabies. For ...
3
votes
2answers
72 views

Why was Darwin's Finch argument valid considering Weismann's argument?

According to Darwin, there was only 1 species of Finch bird in Galapagos. Then Darwin argued that due to diet adaptation and natural selection, their beak changes causing new species--which is ...
3
votes
2answers
107 views

Question about proto-oncogenes and oncogenes?

My textbook says: Growth-promoting genes are called proto-oncogenes. Some can be changed into oncogenes by a point mutation that alters the ability of the proto-oncogene to be switched off. They ...
3
votes
1answer
92 views

If dolphins can see sound, can they say images?

Dolphins determine their surroundings by listening to echoes. Can they mimic those echoes and communicate it to other dolphins, transmitting an "image"? Does the same go for all echolocators?
3
votes
3answers
229 views

Why is dopamine or a dopamine-receptor agonist not pumped into the brain of Parkinson patients?

I am aware that dopamine cannot cross the blood-brain barrier, but can't it be pumped inside the cerebrospinal fluid via some permanent tube implant? Wouldn't Parkinson patients chose that over ...
3
votes
1answer
388 views

Beetle with long, slender iridescent green body and orange legs

I recently saw this beetle while on a trip in central Texas, USA (in a rural area just before sundown). The body was about 2-3 inches long (compare to nearby chair leg and floorboards) and had a long ...
3
votes
1answer
109 views

What is the genomic position of HLA-B*1502 variation?

I've searched the position and SNP ID of HLA-B*1502 variation. However, I couldn't find that where this variant exactly located on genome or HLA-B gene.
3
votes
1answer
155 views

Pigmentation in Jaundice

My textbook says that the yellow appearance of a jaundiced person is due to the accumulation of bile pigments in the skin. I am unable to understand why these pigments are not deposited in a healthy ...
3
votes
1answer
376 views

What is the distinction between the terms detrivores, decomposers, saprotrophs and saprozoic organisms?

All of them feed on dead and decaying matter (detritus). Detrivores and decomposers are distinct, as it says on Wikipedia, in the fact detrivores consume macroscopic clumps of detritus while ...
3
votes
1answer
64 views

Pavlovian Conditioning And Synesthesia

I have been reading about Pavlovian brain conditioning and it seems that documented cases are mostly limited to motor reflexes (like conditioning an eyelid to close when hearing a tone) or taste ...
3
votes
1answer
72 views

What are the mechanistics of stinging nettles?

There is a lot of research on why nettle extracts causes skin irritation and a stinging sensation. However, I cannot find information on how the extract is injected in human skin. Similarly, I haven't ...
3
votes
1answer
85 views

Resources of all known biochemical pathways?

I am looking for a encyclopedia or biochemical pathway atlas of all known or reported pathways. I am very much interested in network and systems biology. Also the references can be open databases, ...
3
votes
2answers
210 views

What is the minimum eye?

What is the minimum eye which confers some evolutionary advantage? By minimum I mean anything less than this has no advantage whatsoever and therefore is not favored by natural selection. By eye, I ...
3
votes
1answer
170 views

Maximum RPM in zero-g before losing consciousness, spinning head-over-heels

There are more than a few scenes in Gravity that I find dubious. Specifically the ones where people are revolving very quickly, either about their own center of gravity or at the end of a rather long ...
3
votes
1answer
103 views

Clarification on the “orientation” of chromosomal rearrangements

I need some clarifications on the concept of "orientation" in case of chromosomal rearrangements. Given a deletion event on a chromosome for example, is the resulting DNA at the breakpoint always in ...
3
votes
1answer
146 views

Are boat-tailed grackles efficient flyers?

The boat-tailed grackle's deep-V tail would seem to cause a great deal of drag or even downward deflection (like an airplane's elevators). How much does this actually affect the bird's flight?
3
votes
2answers
1k views

How to inactivate trypsin permanently by boiling?

I have to perform a hydrolysis of BSA with the enzyme trypsin. As a control I want to inactivate the trypsin enzyme. Can I inactivate it permanently by boiling (100oC) for 10 minutes, or does it it ...
3
votes
1answer
103 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 ...
3
votes
1answer
153 views

Can mosquitos bite in self-defense?

When chasing away wasps or bees there 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 ...
3
votes
2answers
146 views

Is there a difference between any of these terms for proteins: “crystal structure,” “NMR structure,” “solution structure,” and “complex structure”?

My homework wants me to plot all crystal structures determined per year, but when I search on PDB for all structures, many of the articles say "crystal structure," but some say "solution structure" or ...
3
votes
2answers
77 views

What is an Ihh-/- mouse?

This one is too basic question: I just came across $Ihh^{-/-}\ $ mouse. Is that means this mouse devoid of that gene Ihh. What is this sign called and are there other such representations?
3
votes
2answers
517 views

What are the buoyancy control mechanisms of Chambered nautilus?

I'm currently working on an underwater robot and was hoping to use the principle used by the nautilus for buoyancy control. So how do the Chambered nautilus control its buoyancy?
3
votes
2answers
222 views

Human Evolution in Modern Times

I understand that evolution occurred to form the current hominids from a common ancestor millions of years ago. As evolutionary processes take a long time, is there proof of evolution occurring with ...
3
votes
1answer
569 views

What does 'H' in BamHI stand for?

It's not explained on the wikipedia page. So if, apparently, 'H' is not relevant, why is it part of the name? And if it is relevant, why is it not explained?
3
votes
3answers
5k views

If the top epidermal layer is burned away, what is it replaced with?

If the squamous (top) layer of epidermis, or skin, is burned or damaged in another way, will it then be replaced by the next layer of below? Also, from where does the basal membrane originate? Does ...
3
votes
2answers
263 views

What is atrial fibrillation? [closed]

I am wondering exactly what a-fib is (causes and symptoms). I would really appreciate having a sample of an EKG with it (because in my limited research, I have found it nearly impossible to find just ...
3
votes
1answer
577 views

Will the increase in atmospheric carbon dioxide lead to larger insects?

From my understanding, the increase in atmospheric carbon dioxide will also increase oxygen levels. That makes me wonder if in the near future insects will grow larger than they are today, since their ...
3
votes
2answers
158 views

Do RNA molecules bind each other?

I have a question, maybe a naive one. Let's assume that we isolated some RNA from a tissue. Do RNA molecules can bind each other if they have the complementary sequence? I know that some small RNA ...
3
votes
1answer
141 views

Could someone Identify this Insect Hive on my Balcony Grill

A smallish insect hive has been forming on the grill of my balcony in the last month or two, and I wanted to know should I be worried or can I just let it be. Its 13th floor in Singapore, if the ...
3
votes
1answer
614 views

What is the beneficial function of IgE antibody?

Dont tell me the "function" of IgE is to cause allergy ! In whatever texts I have seen it is written that IgE is important to cause allergies but what is the beneficial function of IgE ? Why was it ...
3
votes
1answer
213 views

How to measure quality and quantity of DNA?

I would like to mesure DNA. I quantify the concentration with Qubit fluorometer, but I would like to know also quality of DNA. I try BioAnalyzer (Agilent),but without success. Bioanalyzer measure DNA ...
3
votes
2answers
185 views

Thoughts precede neuron firing or vise-verse?

I am at the verge of submitting a paper on 'scientific explanation of reality' to an international philosophy body. First submitted draft was returned by the evaluation expert, asking me to re-submit ...
3
votes
3answers
151 views

Can antibiotic resistant bacteria compete with normal one in an antibiotic free environment?

The question is based on an intuition that antibiotic resistance can't come along. This mutation will probably make bacteria less tenacious. Is there any research how AR bacteria compete with normal ...
3
votes
1answer
1k views

Action potential and sodium channels

In this video on electro tonic potential, the tutor says that when the potassium channels open the potential drops from +40mV to -80mV, where the sodium channels have already closed at +40mV. Now in ...
3
votes
3answers
233 views

How to learn molecular biology through pubmed research articles?

Instead of using a textbook, is there an alternative curriculum, that simply lists a set of pubmed research articles for each topic covered in a typical undergrad molecular biology course? I am ...
3
votes
1answer
164 views

Evolutionary Cell Structuring

I'm a total novice when it comes to biology, and I'm really just looking for an answer to a question that has been posed to me by people who deny evolution fervently. Evolution dictates that we've ...
3
votes
1answer
218 views

Number of genes required to sustain life

Are there estimates of the minimum number of genes required to sustain life? In what I mean by life here, I don't include viruses.
3
votes
1answer
200 views

Method to recognize the age of a firebug from the pattern on its back

Can I recognize the age of a firebug from the pattern on its back? If yes, what pattern shows what age/stage? Below is what I extrapolated from Wikipedia, but is there a more precise scale with more ...

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