A patient presents with airway narrowing, cleft palate, colobomas, and conductive hearing loss. The patient is diagnosed with Treacher-Collins Syndrome, which may also present with which of the following?
A. Cognitive Disabilities
B. Micrognathia
C. Preauricular Tags
D. Prominent Overbite
E. Tetralogy of Fallot
Answer: D. Prominent Overbite
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The key chemical messenger responsible for increasing cardiac output when animals are exercising or under certain stresses is
A. epinephrine. B. acetylcholine. C. dopamine. D. serotonin. E. glutamate.
In the accompanying figure, why does the curve sharply drop after approximately 45°C instead of mirroring the slope
of the line going from 0-40°C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
What is NOT true regarding chlorofluorocarbons?
a. They are major destroyers of ozone. b. They release oxygen when they absorb UV light. c. They have been used as coolants and in solvents. d. They release chlorine radicals e. One of their chlorine atoms can degrade thousands of ozone molecules.
Which of the following inaccurately represents normal forces across capillary walls?
A) Interstitial fluid oncotic pressure is almost zero. B) At rest, net filtration occurs across capillary walls. C) Interstitial fluid hydrostatic pressure increases from arteriole end to venous end. D) Capillary hydrostatic pressure decreases from arteriole end to venous end. E) Capillary oncotic pressure is due primarily to plasma proteins.