BIOL 2303 Lecture Notes - Lecture 3: Robert Hooke, Bacteria, Cell Wall
27 May 2020
School
Department
Course
Professor
Document Summary
Plant cells, algae, and fungi have cell walls, usually composed to cellulose or chitin but never containing peptidoglycan. Animals cells and protozoans lack cell walls. Most eubacteria have cell walls composed of protein, a complex carb, or unique molecules resembling but not the same as peptidoglycan. Flagella and cilia are organelles involved in locomotion and in eukaryotic cells consist of a distinct arrangement of sliding microtubules surrounded by a membrane. Some have flagella, each composed of a single, rotating fibril and not surrounded by a membrane. Robert hooke observed plant materials were composed of little boxes ; introduced the term cell (1665). Hooke"s observations laid the groundwork for the development of the cell theory , the concept that all living things are composed of cells . Anotini van leeuwenhoek, using a simple microscope, was the first to observe microorganisms. Until the mid- 1880"s, many believed in spontaneous generation, the idea that living organisms could arise from nonliving matter.
