Bacterial strains that are characterized by biochemical differences are called ________.
Fill in the blank(s) with the appropriate word(s).
biovars
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Gram-negative broth serves which purpose when used in the bacterial fecal culture?
a. Evaluation of general flora and predomi-nant species b. Selection of enteric pathogens such as Salmonella, Aeromonas, and others c. Inhibition of normal flora and selection of enteric pathogens d. Enrichment for enteric pathogens such as Salmonella and others
The weak, attractive force between water molecules is due to
A. hydrogen bonds. B. peptide bonds. C. glycosidic bonds. D. covalent bonds. E. ionic bonds.
A. Match each equation in column A with the corresponding standard redox potential in column B
Column A Column B 1. H2O ?½O2 + 2H+ + 2 e– A. +30 mV 2. reduced ubiquinone ? oxidized ubiquinone + 2H+ + 2 e– B. +820 mV 3. NADH ? NAD+ + H+ + 2 e– C. +230 mV 4. reduced cytochrome c? oxidized cytochrome c + e– D.–320 mV B. How do these standard redox potentials support our understanding of the stepwise electron transfers that occur in the electron-transport chain? C. Why would it not be advantageous for living systems to evolve a mechanism for the direct transfer of electrons from NADH to O2?
True or False: amino acids with hydrophobic side chains are most often found buried in the interior of folded proteins
A. true B. false