BISC 121Lg Lecture Notes - Lecture 25: Kimchi, Sauerkraut, Embryophyte
Document Summary
Overuse of antibiotics in humans and livestock has led to resistance. Bioremediation- using organisms to remove pollutants from air, water, and soil: prokaryote decomposers treat human sewage, human created microbes often get killed off by natural microbes. Instead, they feed natural microbes nitrogen and phosphorous. Humans use microbes to make acetone, butanol, etc. ; commercial products: produce vitamins, antibiotics, hormones, and drugs, milk yogurt and cheese, sauerkraut and kimchi, recovery of metal from ores, acetone changed history. No land plants for the first 3 billion years of land. Charophyceans (green algae) are the closest living relatives to land plants: double polymer prevent zygotes from drying out. 5 key land plant traits not present in charophyceans: 1) alternation of generations, 2) multicellular dependent embryos, 3) walled spores produced in sporangia, 4) multicellular gamete producing tissue, 5) apical meristems. Plants were on land ~475 million years ago land plants are grouped by vascular tissue. Bryophytes have no wood: liverworts: hornworts, mosses.
