Ch. 1,3,5,3 Notes.docx - Microbiology o Study of living...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Microbiology o Study of living organisms that are individually too small to be seen w/ the naked eye. o Understanding of living world of microscopic organisms. o Applying that understanding for benefit of human kind & the earth. Characteristics of cells? o Compartmentalization & metabolism o Growth o Evolution Properties of some cells: o Motility o Differentiation o Communication Cell Shapes o Cocci o Bacillus o Vibrio o Spirochetes Cocci – round/sphere shaped o Neisseria o Streptococcus o Staphylococcus o Micrococcus Bacillus – rod shaped o Bacillus subtilis o Escherichia coli (E. coli) o Salmonella typhimurium Vibrio – comma/boomerang shaped o Vibrio cholera Spirochetes – spiral shaped o Treponema pallidum o Borrelia burgdorferi Pleomorphic bacteria – no defined shape o “pleo” – many o “morphic” – shaped o Mycoplasma – no cell wall Size & Shape o Vary widely o Smallest bacterium is 100-200 nm in diameter (Nanoarcheota & Mycoplasm) o Largest bacterium is 500 um (500,000 um) long (Thiomargarita & Epulopiscium) o “Thio” – contains sulfur Eukaryotic All Cells Prokaryotic Membrane bound organelles – nucleus, mitochondria. Linear DNA, multiple. Multicellular DNA Plasma membrane RNA Proteins Ribosomes Unicellular Most have cell wall. DNA is circular – single Nucleoid Plasmids
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Cytoplasm No organelles Plasma (Inner) Membrane o Main point of contact w/ the cell’s internal environment. o Made of a bilayer Outer surface is hydrophilic & inner surface is hydrophobic. Fluid mosaic model – fluid b/c its constantly changing, mosaic b/c its made of many macromolecules o Selectively permeable o Location of respiration, photosynthesis, & synthesis of lipids & cell wall constituents. Capsules vs. Slime layers o Capsules Well organized Firmly attached to cell wall o Slime layer Easily deformed, less organized Loosely attached to cell wall o Prevent dehydration & helps attach to surfaces Protein structures Structure Length Number Function Fimbriae Short Many all over surface Attachment Pilus/pili Long 1-few Attachment conjugation Flagellum/flagella Long 1-several Motility Inclusion bodies o Granules of organic or inorganic compounds o May be bound by membrane o Simply for storage Granule Purpose Found in Membrane bound? Glycogen Carbon storage Bacteria and Archaea Some Gas Vacuole Buoyancy Cyanobacteria, Thiothrix, Anabaena Yes Polyphosphate cell Cell constituents and energy Many bacteria No Magnetosomes Responds to magnetic field Magnetospirllium Yes Endospores o Bacillus, Clostridium, Sporosarcina o Extraordinarily resistant to environmental stresses such as heat, UV radiation, chemical disinfectants, desiccation Cytoplasmic Matrix o Mostly water o Highly organized, packed w/ ribosomes o Protoplast
Image of page 2
Ribosomes o Proteins & RNA o Site of protein synthesis o Prokaryotic Rb are 70S (smaller) while eukaryotic Rb are 80S in size (Svedberg Units) o
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern