A farmer in Mississippi presents with a chronic cough.Chest radiograph reveals an opaque mass. Biopsy of the lung shows macrophages with multiple yeast forms (see enclosed picture).Which one of the following diagnoses is most likely?
A. Coccidioidomycosis
B. Sporotrichosis
C. Blastomycosis
D. Histoplasmosis
E. Paracoccidioidomycosis
Ans: D. Histoplasmosis
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How can scientists determine what atmospheric CO2 levels were like hundreds—or even thousands—of years ago? Select all that apply
A. They can examine ice core samples from Antarctica. B. They can examine CO2 levels in the outermost layer of Earth' atmosphere. C. They can examine the number of stomata in fossilized leaves. D. They can examine the number of fossilized dinosaur skeletons from different eras.
Which of the following is (are) an important
influence(s) on the evolution of mammals? a. continental movements b. geographic isolation c. competition between species d. decline of the dinosaurs e. all of these
Which of the following statements about gas exchange in animals with interacting circulatory and respiratory systems is FALSE?
A) Carbon dioxide moves from the tissues into the blood by diffusion. B) Gases are transported in the circulatory system by the bulk flow of blood. C) Oxygen is actively transported into the circulatory system. D) Air or water moves across the respiratory surface by bulk flow. E) Oxygen and carbon dioxide pass through respiratory membranes by diffusion.
The statoliths of a lobster are replaced with iron filings, and a strong magnetic field is produced at the top of its tank. How will the lobster respond?
A. It will turn upside down and remain at the bottom of the tank. B. It will continuously spin in circles. C. It will not respond in any way. D. It will turn upside down and grip the underside of the tank lid. E. Its dorsal surface will stick to the top of the tank and it will be unable to move.