Eating food contaminated with ________ may result in meningitis in at-risk persons
A) Mycoplasma hominis
B) Staphylococcus aureus
C) Listeria monocytogenes
D) Clostridium perfringens
E) Enterococcus faecalis
C
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Joan wants to discover a microbe capable of degrading an environmental contaminant. Which of the following culturing methods would be most effective for isolation of such an organism?
A. cell culture B. chemostat C. quorum sensing D. enrichment culture E. differential culture
The placenta protects the developing fetus from harmful substances like alcohol or drugs.
Answer the following statement true (T) or false (F)
Match the class of cell-surface receptor with the best description of its function. Not all descriptors will be used
G-protein-coupled receptors ______ ion-channel-coupled receptors ______ enzyme-coupled receptors ______ A. alter the membrane potential directly by changing the permeability of the plasma membrane B. signal by opening and closing in a ligand-independent manner C. must be coupled with intracellular monomeric GTP-binding proteins D. all receptors of this class are polypeptides with seven transmembrane domains E. discovered for their role in responding to growth factors in animal cells
Given the following, Temp: Growth
0C: - 15C: - 25C: ++ 35C: +++ 42C: + 55C: + A) What are the cardinal temperatures of this bacterium? B) Is this organism a psychrophile?