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May
5
comment Importance of organic chemistry in biochemistry/molecular biology?
Personally, I'd recommend taking at least a year of OChem (2 semesters in the US). Your understanding of MolBio will be greatly enhanced by knowing the underlying chemistry.
May
3
comment Feeling of spicy
@WYSIWYG "nociception" is the encoding and processing of harmful stimuli in the nervous system, which, at a certain threshold, is interpreted as pain.
May
1
comment Why is chemotherapy so expensive?
Chemotherapy doesn't have to be expensive, depending on what drugs are used. Newer, more targeted therapies tend to be more expensive because development of the drugs takes 10+ years, and can cost up to $5 billion dollars, so the manufacturers need to recoup their costs.
Apr
29
comment Does crude oil or kerogen contain ancient DNA?
@inf3rno the wording of your question implies that Wikipedia states that there is a lot of DNA present along with other organic materials. It would be better to edit your question to clarify this.
Apr
29
comment Do human-ape hybrids exist?
Human-ape hybrids are genetically impossible, because the two species have different numbers of chromosomes - humans have 23 pairs (46 total) while all great apes (orangutans, gorillas, and chimps) all have 24 pairs, or 48 total chromosomes. The egg would likely not get fertilized, due to differences in surface markers, but if by some chance the sperm penetrated the egg, the resulting cell would never* divide.
Apr
28
comment Does crude oil or kerogen contain ancient DNA?
I don't see DNA mentioned at all in either the petroleum or kerogen articles...
Apr
26
comment What does it mean: carrying the stably integrated gene
@Barbos if this answered your question, please consider accepting it by clicking on the check mark to turn it green.
Apr
25
comment What is genodiversity good for?
Identification of potential partners by body odors is actually selecting for different genes, not similar ones - see this article on "genetic matchmaking" for some additional details.
Apr
24
comment Does the term “upper extremity” include hands?
Generally, upper extremities refers to arms (and everything attached to them), while lower extremities are the legs.
Apr
24
comment Is blood an organ according to biology?
Any reason for the downvote?
Apr
23
comment I have a black tiny bug crawling all over the house
What region of the world are you located in?
Apr
23
comment What is the difference between intrinsic and extrinsic apoptosis?
I would actually change the example to Fas/FasL, as that interaction almost always leads to apoptosis. While TNFα is pro-apoptotic in some circumstances, there are many cases where it isn't, as it is mostly regarded as a pro-inflammatory cytokine, helping to activate cells responding to infection. However, when cytotoxic cells express FasL and bind to a target cell expressing Fas (the receptor), that (almost) always leads directly to the induction of apoptosis. I just think it would be a more clear-cut example. Your choice, though :)
Apr
23
comment What is the difference between intrinsic and extrinsic apoptosis?
Note that the TNFR superfamily is quite large - in this Cell paper from 2001 (sorry, not open access), it lists 26 known receptors binding to at least 18 known ligands.
Apr
23
comment Y Chromosome in Ovary Cancer Data
Just to expand on what @Remi.b said, there is the possibility that at some point in the past, in a male ancestor, a rare event occurred where a portion of the Y chromosome somehow ended up grafted to an X chromosome (or possibly any one of the others), but didn't cause enough issues/abnormalities to be an issue, or at least noted.
Apr
22
comment Does the body have a gate control for pain
Speaking from personal experience, no, the body does not just focus on one area of pain, allowing only it to be felt and other injuries not to be. It just means you hurt in more places.
Apr
21
comment Why do spiders make their web near the ceiling and near a light source?
probably...​​​​​​​​​​​​​​​
Apr
21
comment Magnetic-activated cell sorting vs. FACS
@Wolgast see my edit above for a detailed explanation. Basically, RBCs make up about 95% of all cells in blood, while white blood cells are only 0.1-0.2%. They just overwhelm the cytometer.
Apr
20
comment Do sodium channels keep renewing themselves with new subunits made by genes?
Please do some research on protein turnover. Sodium channels, or any other protein or protein complex, are not just created early in life, then stay where they are until the organism dies. Cells are constantly dying and being replaced, and within a single cell proteins are constantly being degraded and new ones made. For some proteins the half-life is seconds or minutes, for others it can be hours, days, or longer, but eventually it all gets renewed. I suggest you do some more background reading on cell biology - Molecular Biology of the Cell is a good start.
Apr
19
comment Formation of life on other Planets
@poka.nandor yes, you can, with listening to radio waves, for one thing. See here for one description of how planets are evaluated for "life as we know it".
Apr
19
comment Formation of life on other Planets
@PeterU do you have a reliable (preferably peer-reviewed) reference to back up your statement that "Scientists were scanning millions of Galaxies and could see no indication of life anywhere else"? What were their readouts? $CO_2$? The color green? This completely contradicts the mounting evidence of large numbers of rocky, "Earth-like" planets withing a sun's habitable zone.