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Life Began with RNA

Why does a paper about RNA, not other, more well-known organic molecules such as DNA or proteins appear in the cycle of articles on the origin of life? Perhaps our readers have heard about RNA, but what? Most likely, nothing noteworthy for the simple reason that so far only experts in biology know that RNA consists of ‘magic’molecules that formed the background for the origin of life. Once ...

Modified: 30.09.2004
nucleic acid , RNA , DNA , molecular biology , genetic information , life , evolution , amino acids , enzymes , biosynthesis , protein
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Microbes: Keeping it Going

... sustainable development is at all possible Looking rather like a pyramid, evolution is traditionally portrayed as a tree, which is referred to accordingly — an evolutionary tree. THE SUM IS MORE THAN ITS PARTS Before we go about using the concept of life, let us see first that we have the right idea about the concept of a system. So what is it all about? First, any system consists of interdependent parts. For instance, the simplest unicellular organism consists of the following four parts: a membrane,...

Modified: 30.05.2004
organisms , evolution , microorganisms , bacteria , life
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In Praise of Catastrophes

... pages of the Earth’s history, store a unique natural record of its remote and near past. This archive keeps signature of the billion years-long way of the Earth’s organic world from primeval microbial communities to humans, the evolution acme. The life evolution was marked by many geologic cataclysms which caused dramatic changes to environment. The geologic shocks suffered by ecosystems were actually large-scale natural experiments unfeasible for a laboratory. The fragmentary but readable records ...

Modified: 30.05.2004
Earth , organisms , life , ecosystem , evolution , Ordovician , biosphere
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