Which of the following opportunistic organisms is associated with slowly progressive subacute bacterial endocarditis?
a. H. ducreyi
b. H. influenzae
c. Aggregatibacter aphrophilus
d. H. parahaemolyticus
C
A. aphrophilus is opportunistic in nature and is a member of the H. aphrophilus, Aggregatibacter actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella spp. (HACEK) group of bacteria associated with slowly progressive (subacute) bacterial endocarditis.
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Oxygen did not accumulate in the early atmosphere until it reacted with reduced materials, especially ________, in the oceans
A) hydrogen B) elemental sulfur C) ferrous iron D) nitrate
The endomembrane system did not start developing until the atmosphere was ____
a. high in oxygen, high in carbon dioxide b. high in hydrogen, low in oxygen c. changing from low oxygen to high oxygen levels d. firmly in the age of aerobes e. low in hydrogen, low in oxygen
In ____, fertilized eggs from a rare species may be implanted in a related and less rare species
a. host mothering b. captive breeding c. artificial insemination d. commercial harvesting e. sperm banking
Which statement is NOT true about the development of an action potential?
Select one: a. There is a rapid change in polarity from about -65 mV to about +40 mV. b. It requires two types of gated channels. c. The action potential ends when the polarity across the membrane reaches +40 mV. d. Depolarization occurs when sodium gates open and allow sodium ions to enter the cell. e. Potassium gates open after the sodium gates and allow potassium ions to leave the cell.