Top new questions this week:
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It is my (very basic) understanding that neither plants nor animals utilize the nitrogen in the atmosphere. Humans do not make use of atmospheric nitrogen through respiration and plants do not …
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“20% of the energy at only 2% of the weight” is a frequently regurgitated factoid. More precisely, it should read: 20% of oxygen consumption. The problem starts when one looks into the …
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Background A Chimera is an organism that is composed of two or more zygotes. There are several documented incidences of this happening in humans as shown in the cited link. Since chimeras primarily …
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I was in Colorado Springs in mid-October when I noticed something floating in front of my face. I tried dodging it, but it landed on my sunglasses. When, I initially saw it, it was attached to a …
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We are trying to isolate bacteriophages from environmental soil samples. One of the first steps is elution, centrifugation and filtering of the soil samples. One protocol suggests to: Elute the soil …
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There are some images floating around the Internet that were supposedly taken with a microscope, built in the 1920s, that was supposed to achieve resolutions that would normally be ludicrous for an …
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Greatest hits from previous weeks:
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There was question about what causes “morning wood.” It was answered that the erection in the morning is caused by decline of norepinephrine during REM sleep. Which in part allows to prevent …
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Concerning medicine, what are the differences between antibiotics and antibacterials?
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What is the advantage gained by the substitution of thymine for uracil in DNA? I have read previously that it is due to thymine being “better protected” and therefore more suited to the storage role …
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I am reading the answer and I am getting confused by the sentence: At the end of meiosis I females have two daughter cells and meiosis II only occurs if and when fertilization occurs by a sperm …
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Which cells in a human have the longest lifespan? Which cell has the shortest lifespan?
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I overheard a rather heated argument about whether or not animal cells have vacuoles. One person said that they do, but they’re much smaller than vacuoles in plant cells. The other person said they …
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Some vegans claim that humans are herbivores, not omnivores, and that we are not physiologically designed to eat meat (see here: www.peta.org/living/food/natural-human-diet/). “According to …
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