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Apr
16
awarded  Nice Question
Apr
16
accepted How many cells does the smallest animal have?
Feb
28
awarded  Nice Question
Feb
28
awarded  Revival
Feb
28
answered Are these cats calico?
Feb
27
asked Are there cats with black skin?
Feb
27
comment How are 23 chromosomes in human sperm chosen?
Amir, welcome to the site! Your question is very basic, and we have trouble finding out what exactly is unclear to you. Please edit the question to explain which situation you mean exactly (when are they "chosen"? Do you know that human chromosomes are paired? etc.) I will vote to put the question on hold until you have done so, else you will get the wildest guesses as answers, and they won't be very helpful. You can also try reading en.wikipedia.org/wiki/Ploidy, but I admit the language will be hard for somebody who is not a native speaker of English and does not know much biology.
Feb
27
comment How are 23 chromosomes in human sperm chosen?
@chris I think that this question means the OP doesn't know of diploidy and assumes that a more or less random half of the chromosomes present in a normal cell end up in a gamete.
Jan
26
comment How long can a human neuron cell live outside the body in a controlled environment?
You can look into culture protocols. For example this one suggests 7-10 days for culture maturation, then 2 weeks harvest time (scroll down to the last step). While a protocol won't tell you the longest time, it will give you a lower limit for the longest time. This is about nonhuman neurons of course, but there are also human cultures started from stem cells.
Jan
22
awarded  Notable Question
Jan
17
comment Is it possible that a set of functionally related proteins in a pathway fulfill different functions?
Hello Costa, and welcome! I don't understand your question. What is supposed to connect to what, what do you mean by property? It's a very broad tem. And maybe you man exhibit, not execute. I know it's not easy if English is not your first language, but people can't answer if they don't know what the question is. You can edit it to add detail, else it's possible that it will be temporarily closed until you explain more.
Jan
16
revised What does x in “Miscanthus × giganteus” name stand for?
removed "spices" related info, added a bit more detail.
Jan
16
comment What does x in “Miscanthus × giganteus” name stand for?
@senderle Oh, thanks for catching it. I realized that there must be some misunderstanding after Klara's second comment, but I just didn't make the association with species
Jan
16
comment What does x in “Miscanthus × giganteus” name stand for?
Lemongras is also a tough gras, but still used as a spice, sometimes even eaten, cooking.stackexchange.com/questions/53671/…. I don't know why you'd look at spices when you choose biofuel sources though.
Jan
16
answered What does x in “Miscanthus × giganteus” name stand for?
Jan
10
comment Why does hair grow after trimming but remains at a constant length after a while?
Interesting. I looked at the source, and it seemed to imply that hair length is determined only by the length of time in which the hair has grown, which would assume constant growth speed. This would be a very interesting fact, I'd intuitively assume that hair (within the same animal) grows with different speed depending on body part and the current state of the body chemistry. Do you know if such difference exists, or is it a constant speed growth process? I don't remember an explicit statement from the paper, it was just an impression I got, maybe I overlooked something.
Jan
10
comment What's the worst that can happen from too much sleep deprivation? Can you die?
@Superbest the rats die from hypothermia. Sleep deprivation increases the organism's need for energy. At first, sleep deprived animals overeat, but at some time, they cannot compensate and die. After the metabolism has reached the point of no return, you can even let the rats sleep and they will die soon nevertheless. See the popular science book Sleep thieves for a nice summary of the studies.
Jan
10
accepted Why can white hairs get dark again?
Jan
10
revised How can we calculate the minimum sustainable number of the panda population?
The old title sounded indeed a bit off and now provoked a ranty non-answer.
Jan
10
suggested approved edit on How can we calculate the minimum sustainable number of the panda population?