Which of the following compounds is the most reactive dienophile? H₂C=CH2 CH3 COOCH3 2 3 CH3 CH3
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- Which of the following is NOT typical of Halophiles? Choose all that fit the sentence above. Group of answer choices They have peptidoglycan in their cell walls. They have branched lipid membranes They contain colored pigments in their cell membranes They live in high salt conditionsWhich of the following bacteria oxidize nitrite (NO2-) to produce nitrate (NO3-)? Azospirillum Cyanobacter Nocardia Nitrobacter RhizobiumCatalase combines two hydrogen peroxide molecules (H2O2+H2O2) to make two molecules of water. A gas also forms. What is the gas?
- Which of the following is NOT true about chemoheterotrophs? Which of the following is NOT true about chemoheterotrophs? Use organic compounds as a source of both carbon and energy Can use light for energy and CO2 as a source of carbon Oxidize organic compounds (e.g., glucose) to generate ATP They are ultimately dependent on autotrophs to provide their carbon and energy None of the other four answers (all are true of chemoheterotrophs)What metabolic process creates the rotten-egg smell characteristic of many anaerobic environments?Classify the following attributes as belonging to either purple photosynthetic bacteria or heliobacteria. Purple Photosynthetic Bacteria Heliobacteria Bacteriochlorophyll g Heterotrophic Cannot form endospores Reduced sulfur is electron donor for NAD* reduction Gram-positive Gram-negative Autotrophic Some form endospores Organic carbon electron donor for NAD* reduction Bacteriochlorophyll a or b Possess intracellular cytoplasmic Possess only plasma membrane membranes
- Bacteria that are obligate intracellular pathogens of humans are considered to be Autotrophs Heterotrophs Photosynthetic Hyperthermophiles Chemolithotrophs Which of the following statements best describes the pathogenesis of Clostridium botulinum? It elaborates an exotoxin that is a lecithinase that causes tissue necrosis. It elaborates a toxin that suppresses the release of inhibitory neurotransmitters. It produces a polysaccharide capsule that inhibits phagocytosis and contributes to invasion of the central nervous system. It elaborates a toxin that inhibits the release of acetylcholine at cholinergic synapses. It produces a leukotoxin that leads to abscess formation.Why do chemotrophs have to use oxygen? The definition of chemotrophs is = organisms that gain chemical energy by oxidizing bonds. Do the organisms have to oxidize bonds using oxygen?Why does the commercial production of yeast require special equipment to achieve adequate aeration, but alocohol does not?
