Top new questions this week:
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I’m wondering what these star-shaped organisms are on a dead leaf I found in my backyard (Texas). This was taken under my microscope at 40x magnification. They seem to be clear organisms with multiple …
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This might sound like a silly question, but what chromosomes determine whether a human is born a boy or a girl? I ask this because I got embryo.asu.edu/pages/sex-determination-humans when …
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The most common diseases with genetic origin like muscular dystrophy seem to originate from issues with the primary structure of the DNA itself. Also it seems to be somewhat controversial as to …
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Or rather, what’s the longest known food chain between a producer and an apex predator? I’ve found a few similar questions and answers online, but none of the questions clarified some of the nuances …
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In this question Mutation rate breakdown by original and mutated nucleotide for Coronaviridae mutation profiles for SARS-CoV-2 in humans are given. It is a known fact that mutation profiles are …
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The CRISPR/Cas9 method allows new genes to be inserted. After Cas9 cuts the Target-DNA, it can use a homologous piece of DNA as a donor template for homology-directed repair. But HDR only occurs when …
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I am trying to design a primer for TMPRSS2 PCR reaction. However, this gene is in reverse position like in the picture I’ll show. From the nucleotide sequence I got from NCBI, should I reverse the …
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Greatest hits from previous weeks:
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How does the digestive acid (HCl) not burn the surrounding membrane of our stomach? It digests the majority of raw food we eat but how does it stay safely in our stomach? Also, how does the stomach …
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We touched on introns and exons in my bio class, but unfortunately we didn’t really talk about why Eukaryotes have introns. It would seem they would have to have some purpose since prokaryotes do not …
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At the base of fingernail, there is a white semicircle (see on the first picture). But sometimes there isn’t one. My questions are: what is this white semicircle on the fingernail, and what causes it?…
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Which cells in a human have the longest lifespan? Which cell has the shortest lifespan?
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How many human cells are there in our body, on average? Wikipedia says 1013: Bacterial cells are much smaller than human cells, and there are at least ten times as many bacteria as human cells in …
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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 …
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I am a student of 10th grade, and I eagerly want to learn biology. What is the difference between respiration and breathing?
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Can you answer these questions?
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Since a few weeks I am observing a little butterfly in my living room and normally I put insects out but it’s cold outdoors and I thought it’s secure inside. It occassionally flies around, especially …
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Is there a particular reason why certain foods are enriched or fortified with certain nutrients? Such as salt with iodine? Or did we just get used to doing things a certain way since we started …
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