The National Geographic Magazine, Volume 193, Issue 3National Geographic Society., 1998 - Geography |
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Page 67
SIMPLE CELLS How RNA came to be remains a mystery . The first real cells probably looked much like modern prokary- otes - bacteria and the newly designated archaea usually found in extreme conditions . Both ancient and modern ...
SIMPLE CELLS How RNA came to be remains a mystery . The first real cells probably looked much like modern prokary- otes - bacteria and the newly designated archaea usually found in extreme conditions . Both ancient and modern ...
Page 70
... cells by encasing self- replicating molecules within membranes . and meteorites stopped pummeling the planet about 3.8 billion years ago . Before then , con- ditions were thought to be too hellish to per- mit the evolution of fragile cells ...
... cells by encasing self- replicating molecules within membranes . and meteorites stopped pummeling the planet about 3.8 billion years ago . Before then , con- ditions were thought to be too hellish to per- mit the evolution of fragile cells ...
Page 81
... cells lived like plants . Today each contains a relic from that time : a chloroplast , normally a center of ... cells in my biceps have run out of oxygen and must tem- porarily revert to a fermenting lifestyle , just like that of the ...
... cells lived like plants . Today each contains a relic from that time : a chloroplast , normally a center of ... cells in my biceps have run out of oxygen and must tem- porarily revert to a fermenting lifestyle , just like that of the ...
Contents
Naples Unabashed A city schooled in passion chaos and | 32 |
The Rise of Life on Earth Microscopic lifeforms | 54 |
Flashback | |
Copyright | |
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