Tag Info

New answers tagged

1

The article probably had a scrap of truth to it. Ageing is not plastic and longevity can be altered in a variety of ways. Although caloric restriction seems to affect longevity the most, there are also longevity genes from a range of cellular processes that have been identified in yeast and mice, indicating that ageing is a whole system process. But none of ...


0

I think you read about the telomerase: https://en.wikipedia.org/wiki/Telomerase The chromosomes while duplicating, they loose some of the DNA segments from their ends, from the telomer. This is believed to have a direct effect on senescence. The telomerase reproduces the end DNA strip of the chromosomes. This enzyme is found in active form in stem cells ...


1

In tissue culture and cell engineering fields, the word "immortal" is often used to express something else instead of human or animal life spun. When you take cells from human tissues and grow them in test tubes--although flasks or dishes are used in reality--, cells stop growing after long term culture. They say it is cellular senescence. Several genes ...


3

So, the very first map of the human genome was of a few pooled samples with a single nucleotide called at each position. This is basically okay, though, because humans are 99.9 (with possibly a few more 9s) % similar to one another. So you can get a lot of broadly-applicable information out of a single individual's DNA. Further genome-mapping efforts ...


1

From the comment section: We don't have to see the actual changes. It's like chemists who will mix compounds together and obtain a new molecule. They dont see the chemical reaction per se but can test the new molecule to make sure what they predicted would happen had happened. Finally we often use fluorescent proteins to track some of the modification ...


0

Your illustration is wrong. During second meiosis the sister chromosomes go to each their cell, not the same cell. This would correspond to switching the colors up in your illustration like this:



Top 50 recent answers are included