311DCh26 - Ch. 26 pg. 536 555 Very simple cells were...

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Ch. 26 pg. 536 – 555 Very simple cells were produced through a sequence of: 1. the abiotic (nonliving) synthesis of small organic molecules, such as amino acids and nucleotides 2. the joining of these small molecules (monomers) into polymers including proteins and nucleic acids 3. the packaging of these molecules into “protobionts”, droplets with membranes that maintained an internal chemistry different from that of their surroundings 4. the origin of self replicating molecules that eventually made inheritance possible Protobionts – aggregates of abiotically produced molecules surrounded by a membrane or membrane like structure Ribozymes – RNA catalysts that play a central role in protein synthesis; also carry out a number of enzyme like catalytic functions Radiometric dating – based on the decay of radioactive isotopes; each radioactive isotope has a fixed rate of decay Half life – number of years it takes for 50% of the original isotope sample to decay, is unaffected by temperature, pressure, and other environmental variables
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311DCh26 - Ch. 26 pg. 536 555 Very simple cells were...

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