0
votes
0answers
4 views

Where from do plants get the metal ions needed for biological processes?

Biological systems rely on metallic ions (Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn), for example in tetrapyrrole macrocycles coordination centers. Let's say I start with planting a seed. Where are those metal ...
0
votes
0answers
7 views

Larvae Identification

Can you help identify this worm? It was found in a cup of water at a restaurant (unpleasant, yes), likely came through the water system. (Location: Texas) Found these images of it online (in which ...
1
vote
1answer
8 views

If crocodiles are k-selected, why do they supposedly “not age,” as in avoid senescence?

I recently saw a few sources stating that Crocodiles do not biologically age, implying negligible senescence. Basically, a 70 year old crocodile is in the same physical/health condition as a 7 year ...
3
votes
0answers
15 views

The Perplexing Trilobite: What is the Evidence Supporting The Hypothesis That They are Not Crustaceans?

In the field of paleontology, one question that's really bugged me (er, no pun intended) of late is why the subphylum/class Trilobitomorpha/Trilobita is off on its own branch of the Arthropoda phylum, ...
0
votes
1answer
7 views

Mesoderm vs Mesenchyme- what's the difference?

My embryology textbook states that mesoderm can exist as Mesenchyme or Epithelium. I'm not sure what 'epithelium' means. Here is a quote for context: Somatic, splanchnic, and somite mesoderm can ...
0
votes
0answers
8 views

Fine permanent fluorescent marker for blue light

I am looking for a fine- (or small-)tipped permanent marker to write on Petri dishes that is visible under a blue light or a transilluminator. It would seem obvious, but it is a nuisance. The ...
1
vote
0answers
22 views

Can we modify plasmids to eliminate antibiotic resistance?

This is a very general question regarding the potential use of artificially modified plasmids to block or modify bacterial evolution in order to prevent development of anti-biotic resistance. For ...
2
votes
1answer
17 views

What are tail currents?

This is a voltage clamp on an ion channel. When the voltage is stopped there is a still a current at the end (the tail current). I understand that the gates aren't completely closed because of which ...
0
votes
1answer
39 views

Current state of Gene Therapy

I am interested in learning about attempts to treat adult individuals suffering from a genetic disease in which the underlying changes in the DNA of the gene are understood. (i) Are there approaches ...
-3
votes
0answers
39 views

ants and their super powers [on hold]

I've noticed lots of ants being inside a package with sugar confectionery decorations. How did they get into a completely healthy package ? (P.M they ate its colors, what is left is some boring ...
0
votes
0answers
7 views

Methods for detecting local adaptation in absence of genetic data

Background Local Adaptation is a famous subject of interest in ecology and evolution. Among ecologists, it is not rare to try to find evidence of local adaptation in absence of genetic data. As a ...
0
votes
0answers
14 views

What happens when mammalian ovum fails to get fertilized? [on hold]

If mammalian ovum fails to get fertilized , which of the following is unlikely ? a) corpus leuteum will disintegrate b) estrogen secretion further decreases c) primary follicles starts developing d) ...
0
votes
0answers
18 views

How to isolate two plasmids from E. Coli strand?

I have an E. coli cell line I use to express a protein using a two plasmid system. One confers AmpR and one KanR. For mutagenesis I would like to separate the plasmids to increase efficiency of the ...
-1
votes
1answer
60 views

Is evolution a predictive theory?

My feeling is that almost any observation can be explained by current evolutionary theory. Is there any example of someone developing a rigorous framework or mathematical model of how evolution works? ...
1
vote
1answer
29 views

How does mutualism arise? [on hold]

How can a mutualism between two species arise? I have thinking about this for a while and I have come up with the following points 1.If mutualism gives one specie a competitive edge over its ...
-2
votes
1answer
24 views

What are silent carrier traits?

I couldn't find a definition but I have come to know the following from google search: People who are carriers of a thalassemia gene show no thalassemia symptoms and might not know they're ...
1
vote
1answer
17 views

distribution of some injected materials/medicines through blood vessels [on hold]

Fastest distribution of some injected materials/medicines & with no risk of any kind can be achieved by injecting it into - artery or vein?
1
vote
0answers
6 views

Can the presence of Y chromosomes in tissue play a part in trigger tissue rejection in opposite sex?

Can the presence of Y chromosomes in tissue after a tissue graft or transplant from a male to a female play a part in triggering tissue rejection other than other main factors? If so, how?
3
votes
1answer
18 views

Are there any primary structure sequences that strongly suggest b-sheet or alpha helix?

Is there a particular sequence of amino acids that we know will take on a beta-sheet or an alpha helix or is it essentially random?
0
votes
0answers
15 views

Brain controls switched sides? [on hold]

I've been wanting to ask about this for along time, I was told about it when I was young but wanted to ask again. Not long after I was born (I was 7 weeks early) I had to have an operation cuz I ...
-2
votes
2answers
46 views

What are sex linked traits?

Which of the two definitions of sex-linked trait is correct? Traits controlled by genes present on the non-homologous region of sex chromosomes are called ...
0
votes
0answers
15 views

Links between Genetics and Personality Types

This topic was visited briefly in the thread, Genetic Effects on Personality, but I was surprised not to find more on it. (Is there a taboo I don't know about? What's the ethical stance on this ...
0
votes
0answers
9 views

Term of the type xxx-troph for a compound not used by an organism

A prototroph for compound X can make it, a bradytroph grows faster if X is scavenged, an auxotroph needs to scavenge it and a hyperauxotroph lacks both the biosynthetic pathway and the transporters. ...
1
vote
1answer
45 views

What would happen if nerves didn't have refractory period? [on hold]

What would happen if nerves didn't have refractory period? And, what part of his nervous system or neurons are not needed?
3
votes
1answer
36 views

How do we find antibiotics?

So the last class of antibiotics were made in 1984 (I think), which makes it appear as though they are hard to find(/design maybe). How is it then they were discovered? Was it by chance? I know some ...
0
votes
1answer
27 views

Rifle Bullets and Lead Exposure

Does anyone know if simply touching bullets could give you lead poisoning?
1
vote
0answers
15 views

Effective Mycoplasma Elimination from Primary Human Cultures

Obviously the best way to avoid mycoplasma contamination is to avoid it in the first place. In our case, however, it is not possible to avoid. We are culturing viruses and tissues out of human nasal ...
1
vote
0answers
7 views

Effect of interruption of photoperiod in a short day plant

When a short day plant is exposed to its critical period of darkness it flowers. But when it is exposed to a small period of red light which exceeds the critical period it doesn't flower. But when it ...
3
votes
2answers
39 views

Mutating a protein without mutating the gene?

Is it possible to mutate a region of a protein (says about 300 amino acids long) without actually mutating the gene? One possible way that I can think of is to use RNAi and specifically block that ...
0
votes
0answers
23 views

What bug is this? Location:Singapore (Asia) Climate:Monsoon [on hold]

What bug is this? It looks like a worm in a open end conical case. I found it suspending from a ceiling from a web.
0
votes
1answer
13 views

Techniques for phosphosite detection?

I would like to know how phosphorylated sites in proteins are detected in practice. I read some papers where the authors were talking about mass spectrometry techniques. But my question is that why ...
0
votes
0answers
17 views

Plasmid electrophoresis with DNases

DNases are used for treatment of cystic fibrosis. A normal DNase catalyzes the hydrolytic cleavage of phosphodiester bond in one strand of DNA. Scientists, in order to improve efficacy of DNases, use ...
0
votes
0answers
11 views

Lyonization and Turner's syndrome

If lyonization is basically inactivation on X chromosome, and Turner's syndrome patients have only one existing X chromosome, what is the difference between healthy women with inactivated X chromosome ...
0
votes
1answer
9 views

Indoor plants acidic soil

I have a ponytail tree plant. The new growth look anemic, pale and thin. And several leave have browned from the midway to the ends of the leaves. The stem is woody and firm. Though it is in a solid ...
0
votes
1answer
11 views

What are the theoretical and actual (measured) minimum water potentials in plants?

I'm a plant physiology researcher, but water potentials are not really my thing, so I don't have a great grasp on the literature. I'm dealing with water potential data right now though, and it seems ...
0
votes
0answers
5 views

Counter current multiplier system affecting the loop of Henle and the collecting duct

Does the counter current multiplier system work by creating a high solute concentration in the interstitial fluid, so that water is caused to move out of the descending limb and in the collecting ...
1
vote
3answers
55 views

Can a single strand of mRNA form different polypeptide chains?

My book has a statement: A single strand of mRNA is capable of forming a number of different polypeptide chains. In my opinion this statement is wrong because a single strand of mRNA will have same ...
2
votes
0answers
24 views

How do organoarsenics improve digestion efficiency in poultry?

It struck me as very surprising that these organoarsenic compound with structure looking not very compatible with living system is widely used as food additive to increase weight gain and improve food ...
10
votes
1answer
959 views

Darwin's first sketch of a phylogenetic tree

Coming from Darwin's notebook this first sketch of a phylogenetic tree became one of the most emblematic image from Darwin's work. I have a hard time to read what is written on it. What is written ...
3
votes
2answers
26 views

How to find PDB id of an amino acid sequence

Suppose I have an amino acid sequence whose PDB id is unknown. Is there in online server that can find the PDB id of the corresponding amino acid sequence? is there any site that will find the pdb ...
0
votes
1answer
13 views

Is there a difference in how Gas is produced which determines if it becomes a burp or flatulence?

I know that some gases are heavier than air and in the case of a gas leak it's best to escape to higher ground, while some gases are lighter than air such a Helium however unlike Helium i havn't seen ...
-6
votes
0answers
45 views

How many ATP equivalents are required to make one AMP/ADP/ATP? [on hold]

Biochemists and biologists are obsessed with ATP. Their calculation of ATP equivalents is absurd. They claim that one NADH= 2.5 ATP and that one FADH2 = 1.5 ATP blah blah without carefully looking at ...
0
votes
0answers
16 views

Genetic Decline of Mycelium [on hold]

A book I have by Paul Stamets says that after about ten petri dish transfers, genetic decline starts to slow the growth of mycelium. However, there is a four-square mile mycelium colony in Oregon. How ...
-1
votes
0answers
25 views

Why don't male cheetahs rear their offspring? [on hold]

It seems like a huge evolutionary advantage to do so. It could prevent their cheetah cubs from getting eaten when their mother is hunting. Maybe that's not a big evolutionary disadvantage because when ...
0
votes
1answer
13 views

When is Pheophytin used in electron transfer to the q cycle in plants?

If I understand it correctly: (short version) The Q cycle starts with PQH2 it removes the 2H(+) and gives one electron to Plastocyanin and the other to a stored Plastoquinone to charge it to ...
0
votes
1answer
13 views

Which animal that lives in the forest makes this noise?

Which animal makes this noise? Link to audio file The file was recorded next to a forest in Germany.
3
votes
1answer
44 views

What kind of kale is this?

I'm from Pennsylvania and I used to get this kale all the time at the grocery store, but I moved to the West Coast recently and can't find it anywhere! It looks exactly like this photo: Image ...
0
votes
0answers
21 views

How do expression levels change along lineages?

Is there any general trend between gene expression levels (or transcription levels) and cell lineages? For example, I would naively expect that stem cells express less genes as they have the ability ...
0
votes
1answer
29 views

What kind of detergent should I use in cell culture laboratory for cleaning purposes?

I work on establish a cell culture laboratory in the company where I work. All equipment are new and I want to clean lab before I start to work with cells. Is there any special detergent for cleaning ...
0
votes
0answers
14 views

Why do doctors use tendon instead of ligament in key-hole surgery? [migrated]

For knee surgery, the most common method is to use a tendon from elsewhere in patient's body to replace the torn anterior cruciate ligament. But why tendon not ligament? Tendon have different ...

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