Pyloric stenosis is the most common cause of:
A) Mallory-Weiss syndrome.
B) infantile intestinal obstruction.
C) gastrointestinal bleeding in adults.
D) mesenteric ischemia.
Ans: B) infantile intestinal obstruction.
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The period following an action potential during which a neuron cannot be stimulated to generate another action potential is referred to as
A. the refractory period. B. the threshold period. C. the resting period. D. the inactivation period. E. the critical period.
The mesh of branching filaments of fungi is collectively called the ________
a. hyphae b. ascocarp c. mycelium d. septae
Choose the true statement about the morphological data in the chart shown below. The "1" in the box means the trait is present and the "0" indicates that the trait is absent.(Note: All of the characteristics across the top of the columns are considered "TRAITS" for purposes of reading the chart.). TRAITS ORGANISMJawsLungsAmniotic MembraneHairNo TailBipedalLamprey000000Shark100000Salamander110000Lizard111000Tiger111100Gorilla111110Human111111
A. The lamprey is the only outgroup since it has none of the derived characteristics. B. Only the gorilla and humans share all of the derived characteristics. C. The shark is the outgroup since it only has one of the derived characteristics (jaws). D. All organisms in this chart share all of the derived characteristics. E. The salamander and the tiger together are the outgroup because they only share two of the derived characteristics (jaws and lungs).
The carbon atoms in the cellulose of a wood log originally came from _____ absorbed by the plant.
A. glucose B. carbon dioxide C. nutrients in the soil D. water E. oxygen