LA Tech BISC 260 Exam 1 With 100% Correct Answers 2023

LA Tech BISC 260 Exam 1 With 100% Correct Answers 2023 Antony van Leeuwenhoek invented the microscope, first person to describe microorganisms accurately Koch Proved that microorganisms can cause disease Koch's Postulates 1) Pathogen must be present in all disease cases 2) Isolate pathogen, cultivate in pure culture 3) Inoculate into new host, initiate disease symptoms 4) Re-isolate same pathogen Lister First to use disinfectants in surgical procedures Needham Broth experiment: boiled - sealed - Got nasty. So spontaneous generation, right? Pasteur Swan neck flask experiment disproved spontaneous generation; microbes and fermentation; pasteurization of wine; longterm incubation = can't cause disease (VACCINES) Redi Meat jar cheese cloth experiment with how maggots came from fly eggs. Tyndall Dust carries microbes, and spores are a thing Woese Credited for creating the 3 Domain system of living organisms by looking at rRNA, he discovered that ribosomes are different between these groups; DNA sequencing methods What are the 3 domains of life that contain microorganisms? Eukarya, Bacteria, Archaea What organism evolved first? A Bacterial Probiont: liposome surrounding RNA, which eventually started making proteins and DNA What are some of the beneficial products made by microorganisms? Fixed nitrogen. Fermentation and pastuerization. Nutrient recycling. Explain the RNA world hypothesis The vast majority of biologists contend that life began as a polymer called a nucleic acid- specifically, a molecule of ribonucleic acid (RNA) What discoveries led to the proposal of the RNA world hypothesis? RNA regulates gene expression, is catalytic in protein synthesis, and may be the precursor to double-stranded DNA What is the purpose of Koch's postulates? To establish that a microorganism was the cause of a disease When do koch's postulates not work? When organisms can't be grown in culture or infect another organism.