Chapter 1 ver 1

Exam Flashcards Ed Study these ashcards Florida | Florida Atlantic University | Microbiology | Microbiology 3020 | Esiobu | Exam Flashcards Netty V • 266 cards The scientist usually considered the rst to see microorganisms, which he called "animalcules" was: Van Leeuwenhoek If investigating spontaneous Flashcards (/onlinegeneration, Pasteur had his ashcards) laboratory located in a Flashcards stable, Search s… Log Sign In Up theUp results would, most likely, have Sign supported the idea of spontaneous generation Log In Microorganisms are involved in: causing disease curing/treating disease preparing food cleaning up pollutants Sign up for free and study better Anytime, anywhere Get started today! / Traits of Archaea They are usually found as Exam Flashcards rods, spheres, or spirals Ed Study these ashcards They reproduce by binary ssion They contain rigid cell walls They are found as single cells A new organism was found that was unicellular a cm long The 'large' size of this organism alone would mean little Which of the following microscope types would be Flashcards least useful in viewing unstained living cells? Sign Up Flashcards (/onlineashcards) Search s… Log Sign In Up bright- eld Log In A new drug is developed that inhibits formation of the agellar lament by impairing production of the protein agellin Is this going to be a good drug? Potentially - it would de nitely only impair bacteria, but wouldn't matter for the ones that don't use a agellum to move around Sign up for free and study better Anytime, anywhere Get started today! / In viewing a microscopic specimen, oil is used to Exam Flashcards Ed Study these ashcards decrease refraction and increase resolution TRUE OR FALSE: Microbiologists study a variety of organisms, but all are considered either Bacteria, Archaea, or Eukarya FALSE; keep in mind of viruses Flashcards (/onlineashcards) Explain Koch's bacterial Flashcards postulates of infectious diseases Search s… Log Sign In Up Sign Up 1st- isolate the agent from Log In victim 2nd- grow the infectious agent separately in culture 3rd-infect a healthy host and show it produces classical clinical disease 4th- infect new host with same agent Sign up for free and study better Anytime, anywhere Get started today! / TRUE OR FALSE: A light microscope with an Exam 1objective Flashcards lens numerical aperture of 0.65 is capable of allowing two objects 320 nm apart to be distinguished when using light with a wavelength of 420 nm Ed Study these ashcards Explain your answer The useful magni cation of a light microscope is limited Flashcards (/onlineby the ashcards) wavelength of the light source being Flashcards utilized Search s… Log Sign In Up Sign Up Log In TRUE OR FALSE: Resolution decreases (less useful) when the wavelength of the illuminating light decreases FALSE Sign up for free and study better Anytime, anywhere Get started today! / TRUE OR FALSE: It is possible to build a light Exam 1microscope Flashcardscapable of 10,000X magni cation, but the image would not be sharp because resolution is independent of magni cation Ed Study these ashcards TRUE An instrument that magni es slight differences in the refractive index of cell structures is called a(n) Flashcards (/onlineashcards) phase-contrast microscope Search s… Log Sign In Up Flashcards Sign Up Acid-fast organisms such as Mycobacterium Log In tuberculosis contain lipids constructed from mycolic acids in their cell walls TRUE OR FALSE: In the Gram-staining procedure, the mordant is safranin FALSE; iodine Sign up for free and study better Anytime, anywhere Get started today! / TRUE OR FALSE: Negative staining facilitates the Exam 1visualization Flashcards of bacterial capsules which are intensely stained by the procedure Ed Study these ashcards FALSE TRUE OR FALSE: The Gramstaining procedure is widely used because it allows rapid identi cation of a microorganism with little additional testing Flashcards (/onlineashcards) FALSE Search s… Log Sign In Up Flashcards Sign Up Regions of a specimen with higher electron density Log In scatter more electrons and, therefore, appear darker in the image projected onto the screen of a transmission electron microscope Sign up for free and study better Anytime, anywhere Get started today! / TRUE OR FALSE: Scanning electron microscopes Exam 1bombard Flashcards specimens with a stream of electrons, however, the specimen image is produce by electrons that are derived from atoms of the specimen itself rather than by the electrons used to bombard the specimen Ed Study these ashcards TRUE What kind of lenses does an Flashcards (/onlineelectron microscope use to ashcards) focus beams of electrons onto a specimen? Flashcards Search s… Log Sign In Up magnetic Sign Up Log In Small internal cell structures are best visualized with a transmission electron microscope Which microscope is capable of atomic resolution of specimens, evenSign whenup for free they are immersed in better Anytime, water? scanning tunneling and study anywhere Get started today! / Atomic force microscopes use a scanning probe that Exam 1maintains Flashcards a Ed Study these ashcards distance from the surface of the specimen Bacteria that not have a xed shape are said to be pleomorphic You discover a new transport system used by a Flashcards (/onlinenewly discovered bacterial ashcards) species The sugars that are Flashcards transported using this system are phosphorylated Sign Up as they enter the bacterial cell Log In You would describe this transport system as a Search s… Log Sign In Up group translocation TRUE OR FALSE: The cell membrane is a rigid structure that provides bacteria with their characteristic shapes TRUE Sign up for free and study better Anytime, anywhere Get started today! / The lipopolysaccharide (LPS) that is found in the Exam 1outer Flashcards membrane of gramnegative bacteria is also known as Ed Study these ashcards endotoxin TRUE OR FALSE: Sterol-like molecules called hopanoids are thought to be important for the structural integrity of many bacteria because of their suspected role in membrane stabilization Flashcards (/onlineashcards) TRUE Search s… Log Sign In Up Flashcards Sign Up Out of a capsule, coat, core, and Log In exosporium, which of the following structures is NOT found in an endospore? capsule Although penicillin inhibits peptidoglycan synthesis, bacterial cells will continue to grow normally in the Sign presence of penicillin in up for free what kind of environment? better Anytime, and study anywhere isotonic Get started today! / In order to orient themselves in Earth's Exam 1magnetic Flashcardseld, some species of aquatic bacteria use inclusion bodies known as Ed Study these ashcards magnetosomes TRUE OR FALSE: Bacteria growing at lower temperatures have more saturated fatty acids in their membranes FALSE Flashcards (/onlineashcards) Search s… Log Sign In Up Flashcards What kind of layer consists of diffuse unorganized Sign Up polysaccharide material that Log In lies outside the cell wall and is easily removed? slime layer Endospores are resistant to most environmental stressors because they have _ complexed with calcium ions which Sign up for free stabilize the DNA and endospore coat better Anytime, and study anywhere dipoclonic acid Get started today! / ... anywhere Get started today! / TRUE OR FALSE: It is possible to build a light Exam 1microscope Flashcardscapable of 10 ,000X magni cation, but the image would not be sharp because resolution is independent... started today! / TRUE OR FALSE: Scanning electron microscopes Exam 1bombard Flashcards specimens with a stream of electrons, however, the specimen image is produce by electrons that are derived... probe that Exam 1maintains Flashcards a Ed Study these ashcards distance from the surface of the specimen Bacteria that not have a xed shape are said to be pleomorphic You discover a new transport