Biology Stack Exchange Community Digest

Top new questions this week:

What is this animal looking like an Axolotl?

My friend caught a strange looking animal and he's saying it is an axolotl. I keep telling him it's almost impossible, since they are almost extinct in their natural environment and he caught it in ...

species-identification zoology  
asked by Samuel Fyckes 18 votes
answered by tyersome 26 votes

How can one relate in vitro studies of caffeine (dose expressed as concentration) to dietary intake of caffeine (dose in mass)?

Having difficulty making the data in the below charts to apply to daily life. What is the right interpretation and implementation? How are the “in vitro” results of the below charts relevant to levels ...

biochemistry cell-biology toxicology  
asked by Constantthin 5 votes
answered by Jan 2 votes

What are these near microscopic white bugs from my comb?

I saw a whole bunch of white bugs crawling on my comb in the medicine cabinet, they didn't photograph well but I did manage to get a bunch of them in mineral oil and eventually take some micrographs. ...

species-identification arthropod  
asked by John C 4 votes
answered by tyersome 1 vote

Breeder's equation and equivalent expressions for narrow-sense heritability

I am trying to model the phenotype of a trait as $X = G + E$, where $G$ and $E$ are the genetic and environmental effects. (I'll ignore the distinction between broad-sense and narrow-sense ...

asked by riceissa 3 votes
answered by riceissa 0 votes

Selection marker for a cytoplasmic vector that works at low expression levels?

I need to express a selection marker on a plasmid in human cells (e.g. HEK293). However, I am using a cytoplasmic vector derived from a non-human virus with its own mechanism for transcriptional ...

molecular-biology cell-culture experimental-design antibiotics selection  
asked by Mowgli 3 votes
answered by Willk 0 votes

Bimodal frequency distribution of size of protein loops

The graph of number of amino acid (AA) residues in a loop Vs the frequency of their occurrence in proteins largely follows a tending-to-zero pattern. However, there appear to be some specific number ...

biochemistry molecular-biology proteins  
asked by AP2261 3 votes
answered by David 2 votes

What is the charge of (bacterial) ribosome?

Ribosomes are negatively charged and thus electrostaticaly repelled from DNA. However, I could not find a good reference that would allow me to estimate the magnitude of negative charge on a ribosome. ...

genetics dna biophysics ribosome  
asked by Martin 3 votes

Greatest hits from previous weeks:

How long can an octopus survive out of the water?

I saw videos of octopuses crawling on the ground and I was wondering how long an octopus can survive when out of the water? Does it depend on either its size (i.e., does a big octopus from deep sea ...

physiology marine-biology invertebrates molluscs  
asked by Manuella 32 votes
answered by AliceD 47 votes

What factors are known to affect evolution?

My understanding is that the possible mechanisms of evolution are: Environmental changes Cultural/mating preferences Population Immigration Genetic Mutation Am I missing anything? I've heard that ...

asked by blunders 10 votes
answered by DQdlM 16 votes

Why can't the brain and red blood cells use fuels other than glucose?

The question is rather straight forward: I have always been curious as to why, but cannot find an explanation online. I can imagine that the mechanism is different for each, but why does brain tissue ...

biochemistry metabolism  
asked by LanceLafontaine 16 votes
answered by Alan Boyd 12 votes

What happens to the holes in the skull where teeth were developing?

In Skeptics.SE, a question regarding the skulls of children arose. Depicting a scary skull where the permenent teeth are "hidden" inside the jaws and the milk teeth are in the their place. After all ...

human-biology teeth  
asked by SIMEL 6 votes
answered by mikedugan 6 votes

What is the difference between osmotic potential and osmotic pressure?

Which term is used to calculate water potential? Does osmotic potential mean the same as solute potential?

membrane-transport osmosis  
asked by Abdul Wajid Lakhani 4 votes
answered by Aidan Rocke 3 votes

Differences Between Protein Motifs and Protein Domains?

I am in a 300-level molecular biology class and am unclear about this concept and how to delineate motifs versus domains of proteins. Any suggestions would be much obliged.

biochemistry proteins protein-folding  
asked by Lauren 11 votes
answered by Bitwise 12 votes

Why are bacteria and archaea in different domains?

As I understand it, the main difference between the Bacteria and the Eucaryota domains are that eukaryotes have a nucleus and bacteria don't. I understand that bacteria and archaebacteria have enough ...

bacteriology taxonomy  
asked by Orcris 5 votes
answered by shigeta 9 votes

Can you answer these questions?

Can wood frogs who have frozen and thawed remember their past lives?

Wood frogs (Rana sylvaticus) can survive being frozen for up to 7 months at temperatures as low as -16 °C. Their breathing stops, their heart stops and all signs of life disappear. (Source) I have ...

memory amphibians hibernation  
asked by James Newton 3 votes

Has there ever been an approved viral infection treatment method based on the physical/mechanical properties of virus?

I imagined that typical cells and viruses could have very different physical properties or reactions to mechanical stresses, which makes selective targetting possible. For instance, some major ...

virology infection treatment  
asked by y chung 1 vote

Can sleep be a barrier against aging?

I know that what I'm writing about may be a little strange, but as far as I know,when we are asleep, our human body is programmed to carry on biological functionalities in a really optimized way and ...

sleep senescence  
asked by jihed gasmi 1 vote
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