BIOL 304 Lecture Notes - Lecture 18: Hydrothermal Vent, Hydrostatic Skeleton, Acetogen
Document Summary
Undirected panspermia: dispersal of microbes from planet to planet. The miller urey experiment produces complex organic molecules and amino acids. Problems: not enough concentration, the nucleotides are different from modern nucleotides. Protocells arise spontaneously and are readily selected (enclosed lipid compartment, permeable to charged particles) Carries genetic information and able to catalyze replication (possible self- replication) Small rna replicators still exist today in virus. Exergonic reactions require far-off equilibrium environment to proceed. Synthesis with dissolved co2 and rich metallic catalysts allows growth of acetogens and methanogens. Special morph, for particular reason that fit the lifestyle. Segmentation: improve the efficiency of circular and longitudinal muscles; allow evolution of limbs, modification of single segments; complex organism evolved from modular organism from modular organism. E. g. fish jaw (teleost) can be shoot forward to catch prey. E. g. modification around limbs of millipedes that facilitates running on smooth surface (chitin suction cup; y-shaped bar for larger muscle attachment area)
