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What types of adverse environmental conditions can Azotobacter cysts withstand?
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- Which type of bacteria is responsible for producing ex-tremely toxic sulfuric acid?(a) Thiobacillus (d) Sulfur-oxidizing(b) Sulfate-reducing (e) a and d(c) Sulfur-reducingOne of the common defense mechanisms pathogenic bacteria have to avoid phagocytosis is the presence of:(a) Pili(b) A cell membrane(c) Peptidoglycan(d) A capsule(e) Endospore formation17) What gives Aspergillus sydowii colonies their hairy appearance? a) Hyphae () b) Stipes ( c) Growing media ( ) d) Ascocarp 20) Identify the most correct choice: (a) Needham concluded that living can be generated from non-living. () b) Pasteur concluded that living can only be generated from living. ) c) Spallanzani concluded that living can be generated from non-living. ) d) all of the above. ) e a and b
- a. How are bacterial endospores and cysts of protozoa alike?b. How do they differ?Which structure is “slimy” in texture and may protect a prokaryotic cell from destruction by our immune system? a)Pili. b)Flagella. c)Capsule. d)Nucleoid. e)Mark e if none are correct.Which condition is correct based on the growth of cells at the beginning? A) Cells are in small numbers B) Cells in a large quantity C) The number of cells is insignificant
- The cell wall of a gram-positive bacterium is composed of a thick ________ layer. A) protein B) poly-β-hydroxybutyric acid (PHB) C) lipopolysaccharides (LPS) D) peptidoglycan. Regarding the Characteristics of a bacterial Capsule A) All bacteria have (B) It is composed of peptidoglycan (C) Is an important mechanism for protecting a bacteria against ingest by White Blood Cells (D) MotilityWhat is it about clams that make them especially likelysources of human infection?(a) They have sticky interiors that make microorganism at-tachments easy.(b) Their ability to glow with Photobacterium phosphor-eum attracts pathogenic species of microorganisms.(c) They are best eaten raw.(d) They are filter feeders, obtaining food by filtering waterand extracting microbes.(e) Their hard outer shell seals in and concentrates anycontaminating microbes.
- which of these are important in creating biofilms? (select all that apply) A) GLYCOCALYX B) FLAGELLA C) ARCHAELLA D) AXIAL FILAMENTS E) FIMBRIAEwhich of these are important in creating biofilms? (select all that apply) choose the correct answer. A) GLYCOCALYX B) FLAGELLA C) ARCHAELLA D) AXIAL FILAMENTS E) FIMBRIAEDescribe the cross - section side view of a Gram - negative cell . Clearly state where the following would be located or write the letters in order of appearance from the outside to the inside . If any of these structures are not present , make sure to leave them out . A ) peptidoglycan ; ( B ) periplasm ; ( C ) porin ; ( D ) LPS ; ( E ) teichoic acids ; ( F ) plasma membrane : ( G ) outer membrane : ( H ) nucleoid