Which of the following alphaproteobacteria is said to resemble mitochondria? Select the correct response: Rickettsia Cyanobacteria Actinomycetes Agrobacterium
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- Describe/define the following terms in relation to cyanobacteria: heterocysts akinete hormogonia gas/vesicles stromatolitesSelect all statements that are true regarding members of the genus Mycobacterium. O They contain mycolic acids O They can cause tuberculosis O One species causes tuberculosis O They are proteobactria O They are practically impenetrable by antibiotics O Their cell walls lack peptidoglycan O They are easy and fast to grow under laboratory conditionsMycoplasmas are bacteria that lack cell walls. On the basis of this structural feature, which statement concerning mycoplasmas should be true? They are gram-negative. They are subject to lysis in hypotonic conditions. They lack a cell membrane as well. They should contain less cellulose than do bacteria that possess cell walls. They possess typical prokaryotic flagella.
- Propionibacterium acnes is a normal member of the skin microbiome that benefits the body by lowering the skin's pH- an antimicrobial effect. However, P. acnes is also the leading cause of acne. Explain mechanistically how can a bacterium be normal and beneficial but also be pathogenic?Eubacterial ribosomes can be inactivated by all of the following antibiotics except: chloramphenicol diphtheria toxin erythromycin streptomycin tetracyclineMycoplasmas are pleomorphic bacteria. How do the unique structural characteristics of mycoplasmas relate to their bacterial morphology? Mycoplasmas have a low G + C genome content. Mycoplasmas appear Gram negative when a Gram stain is performed. Mycoplasmas lack a cell wall. Mycoplasmas form colonies with a fried-egg appearance.
- In the diagram below, identify the structures of a cyanobacterial cell based on the following descriptions: a) Outer cellular covering which includes: Mucilaginous layer – outermost layer covering the cell wall; protects the cell from harmful factors of the environment Cell wall – found just below the mucilaginous layer; 2 or 3-layered, the inner layer lies in between the outer wall layer and plasma membrane; the outer layer is made of peptidoglycan Innermost plasma membrane – selectively permeable membrane enclosing the cytoplasm b) Cytoplasm – found below the plasma membrane; the protoplasm which contains structures of different shapes and functions. Lamellae, which contain pigments such as chlorophylls, carotenes, xanthophylls, phycoerythrin and phycocyanin, are located in the peripheral region of cytoplasm. Ribosomes may also be found scattered in the cytoplasm. c) Nucleic material – the nucleoplasm that is centrally located in the cell and contains chromatin in the form…Which of the following diseases is NOT associated with bacteria that form endospores? tetanus anthrax toxic shock syndrome botulism gangreneGenus of the amoeba like Archaea.* Sulfolobus Thermoplasma Halobacterium Methobacterium Which of the following is a characteristic of the Staphylococcus aureus? spore forming gram positive cocci facultative anaerobic gram negative cocci facultative anaerobic gram positive cocci facultative cocci in chains
- Match the following genera correctly with the correct characteristic, role, or disease. Vibrio Lactobacillus Streptococcus Leucothrix Escherichia Clostridium Nitrosomonas Rickettsia Legionella Choose one for each : Infect other bacteria Can cause severe food poisoning, especially from improperly canned food Strep throat Normally an important gut microbe but not a probiotic HIV MRSA Typhus Whooping cough Legionnaire's disease Disperse by gonidia Produce antibiotics Bioluminescent Probiotic Important in nitrogen cycle TetanusWhat are the metabolites secreted by the following: 1. Halobacterium salinarum 2. Metallosphaera sedula 3. Lactobacillus acidophilusThis bacteria is commonly found in soil and water, and can cause otitis externa (aka swimmers ear). Pseudomonas aeruginosa Streptococcus pyogenes Staphylococcus aureus Staphylococcus epidermidis