You identify an enzyme involved in a cellular reaction. How does the enzyme affect the reaction equilibrium between reactants and products and the time needed to reach equilibrium?
A. It alters the reaction equilibrium and shortens the time needed to reach equilibrium.
B. The reaction equilibrium is unaffected, but it shortens the time needed to reach equilibrium.
C. It alters the reaction equilibrium and lengthens the time needed to reach equilibrium.
D. The reaction equilibrium is unaffected, but it lengthens the time needed to reach equilibrium.
B
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Treatment of fungal infections is more difficult than treatment of bacterial infections because the greater metabolic similarity between the fungi and their hosts limits the ability of a drug to have a selective toxicity.
Answer the following statement true (T) or false (F)
In general, microbial growth in the open ocean is most limited by the availability of ________.
A. iron B. manganese C. phosphorus D. nitrogen
A microorganism that can use ready-made folic acid from its environment and no longer needs to synthesize it from the PABA precursor demonstrates an example of what type of antimicrobial resistance mechanism?
A) alteration of an enzyme B) alteration of targets C) development of enzymes D) alteration of a metabolic pathway
Mycoplasmas are pleomorphic because they
A) have no cell walls. B) are low G + C content Gram-positive bacteria. C) exhibit snapping division. D) have sterols in their cytoplasmic membranes. E) produce endospores.