Which of the following organisms will be positive for the PYR hydrolysis test
A. Enterococcus and Staphylococcus agalactiae
B. Enterococcus and Staphylococcus gallolyticus
C. Enterococcus and Staphylococcus pyogenes
D. Enterococcus and Staphylococcus pneumoniae
Answer: C. Enterococcus and Staphylococcus pyogenes
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You have found a mutant of Streptococcus pneumoniae that has lost the ability to produce a capsule. If you inject this strain into a population of healthy mice, what prediction can you make about the consequences?
A. The mice will die of pneumonia. B. The mice will remain healthy. C. The mice will get a severe case of pneumonia and recover. D. The infection will respond to antiviral medication.
Which portion of the photosynthetic apparatus is involved in the oxidation or splitting of water?
A. reaction center B. antenna complex C. P680 chlorophyll D. manganese cluster E. light-harvesting complex
The smallest branches of the respiratory tree are the:a
pharynx. b. tracheae. c. bronchial tubes. d. bronchioles. e. bronchi.
A disaccharide, such as maltose, consists of two molecules of glucose linked by what type of bond?
A. glycosidic B. hydrogen C. peptide D. phosphodiester E. steroid