BISC 1112 Lecture 5: Lecture 5
15 Feb 2017
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Document Summary
Chemical and physical processes produced simple cells. 1953- miller and urey experiments showed abiotic synthesis. Organic molecules in a reducing atmosphere is possible. Volcanic simulated activity produced more amino acids. Usually microscopic but make up in numbers. Some are big enough to see with naked eye. Use to classify bacteria by cell wall composition. Bacteria have simpler walls large amount of peptidoglycan. More likely to be resistant to antibiotics. Antibiotics will target peptidoglycan damage cell walls. Remain viable in harsh conditions for centuries. Allow them to stick to their substrate. Many capable of movement away or towards stimulus. They are not primitive just very evolved. Dna from different individuals brought together by: Donor cell attaches to recipient by pilus pulls it closer. Come prokaryotes convert atmospheric nitrogen to ammonia. So important that if the disappeared all other life would probably disappear too.
