BIO 200LLB Lecture Notes - Lecture 25: Citric Acid Cycle, Chemosynthesis, Cyanobacteria

• School: University at Buffalo
• Department: Biological Sciences
• Course: BIO 200LLB
• Professor: Herreid, C F

Document Summary

No oxygen in the atmosphere; no ozone layer, uv radiation bombards earth. Krebs cycle evolved, ozone layer developed, land could be occupied. There are 6 known phyla of photosynthetic bacteria widely distributed. Only the cyanobacteria is capable of oxygenic photosynthesis. But some prokaryotes evolved a way to deal with the o2. Oxygen atom + 2 electrons o^= Glucose 2 pyruvic acid (3c) kreb"s cycle. The mitochondria and chloroplasts enter the cell after the membrane system of the cell has become established. Similarities between bacteria and mitochondria and chloroplasts: Enzymes for synthesis of dna, rna, protein similar. Electron transport system in the walls of the structure. Archaeal genes run processes involving dna and rna (informational functions): replication, transcription, and translation. Bacterial genes run metabolic and housekeeping chores (operational functions. Prokaryotes protista plantae, fungi, animalia. Choanoflagellates eumetazoa( true animals), parazoa (sponges) Ancestral flagellates protozoa (zooflagellates), single celled algae (photoflagellates) Phytoflagellates ch a and c ancestors dinoflagellates, diatoms, brown algae.