4
votes
1answer
118 views

Natural enemies boost deep evolutionary fitness?

"Two species that reduce one another's fitness on microevolutionary (short-term) timescales can increase each other's macroevolutionary (long-term) fitness" Opinions? Intuitive Examples: ...
5
votes
1answer
88 views

What makes alcohol harmful to mammals?

During the alcohol metabolic pathway, harmful by-products are made like acetaldehyde, hydroxyethyl, superox­ide anions, and hydroxyl radicals. How do these toxic compounds harm our tissues? Many of ...
5
votes
1answer
544 views

Could alcohol be used as an antibiotic?

I was thinking about how alcohol is used to sterilize, and I was wondering if it would be possible to use alcohol as an antibiotic? if it kills bacteria, couldn't (conceivably) alcohol in the ...
3
votes
1answer
719 views

Problem with bacterial transformation with electroporation

I have a problem with a bacterial transformation of a yeast gene that I can not solve. I isolated yeast DNA and did a PCR to get my product. I am using pCGCUm vector with a GFP construct. I digest ...
1
vote
2answers
39 views

Regulation of the replication of mtDNA at embryonic level

While reading an article on mitochondrial inheritance I came across this link. The results state that mitochondrial DNA replication is regulated in different cells of an embryo at different levels. ...
1
vote
1answer
302 views

What is the most recent non-primate ancestors of humans?

If we go down the evolutionary tree of humans, (Homo sapiens, Homo erectus, ...), what will be the first non-primate ancestors?
3
votes
1answer
53 views

Are there cannibalistic k-selectors?

My understanding of r- and k-selectors does not go deeper than the wikipedia article. I understand k-selectors to be creatures that put tendentially more effort and energy into rearing their ...
3
votes
2answers
1k views

Are Italians genetically separated from other Europeans?

I was reading this Wikipedia article about the genetic history of Italy, and I found it interesting. There are however a few things that puzzle me, because they seem to contradict each other. For ...
3
votes
1answer
82 views

What's a replicate line?

The methods section inside a paper I'm reading make mention of replicate lines. Example: "We founded 10 replicate lines from a single clone". This is in the context of experimental evolution and ...
1
vote
2answers
1k views

Definition of “Niche Complementarity”

What does "Niche Complementarity" means? On this website they define "Niche Complementarity" as: The tendency for coexisting species which occupy a similar position along one niche dimension ...
2
votes
0answers
69 views

What are the ingredients of Pheromone Trap using for controlling Fruit flies of cucumber?

Pheromone Traps are used for fruit fly control. But I have no idea which ingredients or chemicals are used for preparing Pheromone trap
2
votes
2answers
4k views

Why aren't we allowed to refreeze previously thawed breastmilk in refrigerator?

https://www.breastfeeding.asn.au/bf-info/breastfeeding-and-work/expressing-and-storing-breastmilk Previously frozen— thawed in refrigerator but not warmed 4 hours or less (ie the next ...
-1
votes
1answer
23 views

Order of events in hibernation

Arrange this in sequence : i. Heat loss exceeds heat production. ii.As body temperature falls, heat loss decreases. iii.Body temperature equals environmental temperature. ...
0
votes
1answer
23 views

Is ability to easily pollinate desirable?

In Mendel's crosses was it desirable for the plants to be able to cross-pollinate and self pollinate easily ?
1
vote
0answers
30 views

Where can I get yeast mutants? [duplicate]

I want to use some yeast mutants to conduct gene functional analysis, and the gene was isolated from plants. Can anybody give me some information regarding the websites or agencies from which I can ...
3
votes
0answers
50 views

Why is this dry pepper fruit still “powered”?

Check out this photo of my pepper plant this cloudy morning: (click for full res) Usually (and this can be seen on 2 and a half of the 4 fruits in this pic) the fruits are "disconnected" from the ...
1
vote
0answers
66 views

3' or 5' DNA capping protein

Does anyone know of a protein/molecule that can be attached to one end of the DNAs temporarily ? eg. i would like to only to allow one strand of DNA be ligated to another DNA molecule to either it's ...
1
vote
2answers
173 views

Do people often blow out the air from their lungs a lot when living in the cold condition to keep their lungs warm?

In a cold climate, do people often blow out the air from their lungs a lot when living in the cold condition to keep their lungs warm? I asked this question because it could connect to how people in ...
6
votes
2answers
98 views

How predictably will RNA polymerase not transcribe repetitive sequences?

I am working on an (expensive) synthetic construct, which happens to have many "repetitive" sequences within it that are integral to its function. Primarily, the two sequences that are worrying me ...
2
votes
0answers
56 views

What are these fleeting sea worms? [closed]

I filmed the creatures below this August in the Mediterranean (specifically, the port of Fornells in Minorca of the Balleares). The images were taken from a boat moored just outside the harbor and ...
5
votes
1answer
57 views

What limits our ability to grow enamel rods?

From what I've understood from what I've read (which might be wrong), enamel rods extend away from the dentin in our teeth. As young people grow, the rods are thickened. What are the technical ...
2
votes
0answers
33 views

How has the use and subsequent ban of DDT affected insect populations?

Living in Australia there were less ticks for example during the use of DDT, now there are more ticks prevalent here. I am wondering if any insect species have declined permanently as the result of ...
0
votes
1answer
2k views

For the human head, which direction is anterior, and which direction is ventral?

I read the wikipedia entry and I am sort of confused. In dog, the nose is toward the front. That's anterior. So I conclude that human nose is anterior. In dog, the head is on the back. So that's ...
0
votes
1answer
1k views

What is the difference between SNP and STR?

I thought that these were just different format of the same data. But it seems there isn't a way to convert SNP (single nucleotide polymorphism) data to STR (short tandem repeat) data. Am I right? ...
2
votes
1answer
66 views

Does the existence of one species imply the existence of many other?

Reading one of Sir Arthur Clarke's scifi stories, I came across a statement something to the effect of, existence of a single species automatically implies the existence of many other species. So ...
1
vote
1answer
121 views

Hypothetically, what is the smallest functional form of human?

Since the my first encounter with doraemon manga, I've been wondering many things, one of them is the small light. Assuming we had an instrument, such as small light, which enabled people to grow and ...
3
votes
1answer
105 views

Where does all the carbon go?

I found it hard to get numbers on global primary production, but apparently it's somewhere around 50-60 $Gt / year$ for carbon content in the terrestrial production, and a similar figure for the ...
15
votes
4answers
2k views

Why would a single celled organism evolve to be multi-celled?

I read a story this week on Richard Lenski who has been 'evolving' E. coli for more than 50,000 generations now. One comment I read was from someone who doesn't accept Evolution who pointed out that ...
1
vote
2answers
546 views

Why doesn't T5 exonuclease have endonuclease activity in Gibson assembly?

Gibson assembly uses T5 exonuclease to chew back the 5' end of dsDNA to generate overhangs. However, T5 exonuclease, in contrast to lambda exonuclease, is reported to have ssDNA endonuclease activity ...
2
votes
1answer
86 views

Identification of this plant?

Photographed in Rocky Point, Mexico. Any ideas about this plant? Thank you!
4
votes
1answer
229 views

What is the evolutionary advantage of regret?

Some motivational speakers may say that regrets are only useful to learn something from. What are the other advantages?
9
votes
2answers
178 views

Does Lucid Dreaming decrease the regenerative effect of sleep?

After watching this SciShow video on sleep, I wonder about lucid dreaming. Specifically: Does lucid dreaming and associated directed agency within Lucid Dreaming decrease the regenerative effect of ...
1
vote
1answer
342 views

How do proteins get into the blood stream?

So I'm asking this in reference to the injection of insulin, which is commonly done subcutaneously (in the hypodermis, a fatty part of skin). Now I know proteins usually get into the blood when ...
4
votes
1answer
118 views

Why do some women have menstruation-like spotting throughout their pregnancy?

An interesting question that was asked during a lecture about human reproduction: what is the biological mechanism behind some pregnant women getting monthly spotting that they mistake for a regular ...
4
votes
1answer
273 views

DIfference between diversification and differentiation

In Adaptive dynamic : what is the difference between Ecological Differentiation and Ecological Divergence ?
3
votes
1answer
125 views

How common is complete heterochromia?

How common is complete heterochromia? (One iris is a different color from the other) Are there any statistics available for this? If no, why not?
1
vote
1answer
474 views

Can two denatured DNA strands reassociate?

What matter if I increase the temperature to 95°C. So double-strand DNA denatured into two ssDNA, and then I decrease the temperature to room temperature. Are they able to reassociate after ...
4
votes
1answer
2k views

What are the advantages and disadvantages of being ambidextrous?

What are the advantages and disadvantages of being ambidextrous? We have two hands and we nearly can't use one and this seems like a weakness, and a stupid one when you first think about it. But ...
3
votes
2answers
277 views

Why is there such an argument about evolution?

DISCLAIMER: I am a Christian, although I happen to believe that some form of guided evolution via natural selection is God's mechanism for creation. Now to my question, which is related to my ...
1
vote
1answer
88 views

(Web)app to search metabolic/signalling pathways

I'm looking for an application where you can find pathways by selecting a chemical occurring in it. So, for example, selecting 6-phosphogluconolactone brings up the pentose phosphate pathway or any ...
1
vote
1answer
75 views

DNA and gene activation

As far as the genetic content of each cell is concerned I have read to my satisfaction that all cells of a person's body except the red blood cells (with no nucleus and so no genetic message) and the ...
1
vote
1answer
96 views

How do I compare the variance of a distribution of species in one area versus another?

It's possible that this question is better suited for stack overflow, but I think the ecologists on this site might be better equipped to answer it. I'm trying to study two geographically-isolated ...
2
votes
1answer
288 views

Independence of Light independent reaction in photosynthesis?

Inspired by a question asked to me by a classmate, I have the following question about Light-independent (dark phase) reactions in photosynthesis:- Let us suppose an algae sample was exposed to ...
4
votes
1answer
374 views

How much does the Hayflick limit/telomere length vary across taxa and within humans?

Since they seem to be quite connected, I'm curious if anyone knows of research comparing the Hayflick limit (and presumably by extension telomere length) between different taxa. I've heard the ...
0
votes
1answer
32 views

What happens between making a DNA library and screening by nucleic acid hybridization?

I understand how a plasmid library is made and how each clone is put on the nitrocellulose membrane and nucleic acid hybridization is done. What I don't understand is how each clone is "identified" ...
0
votes
2answers
66 views

Telomeres in cloning experiments

In whole animal cloning ( eg. Dolly ) the nucleus is taken from a somatic cell. So isn't shortening of telomeres a problem ?
2
votes
1answer
490 views

Can sugar alcohols, and glycerol in particular, cause intoxication?

I'm mostly curious about glycerol, which I use as a sweetener. I've been told that it can cause intoxication, because it is an alcohol. Is this true? If so, are there any good sugar alcohols which ...
1
vote
1answer
376 views

Recombination frequency, linked genes, and independent assortment

Gene R is genetically linked to gene T with a recombination frequency of 0.3. Gene T and gene X assort independently from each other. Your colleague tells you that gene T and gene X reside on the same ...
1
vote
0answers
43 views

Transduction with P1 lysate prepared from strain that is proC::Tn10

If I do a transduction with a P1 lysate prepared from a strain that is pro*C*::Tn10 and the recipient is wild type, will all my recombinants be ProC- and Tet resistant since the Tn10 is in the proC ...
2
votes
1answer
895 views

Orientations of codon and anticodon

So 5'-AUG-3' is the start codon on an mRNA transcript Does that mean that the tRNA anticodon is 5'-CAU-3'? Here, I see that the tRNA anticodon for methionine is UAC, and the chart doesn't specify ...

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