A patient has fever, difficulty breathing, chest pains, fluid in the alveoli, and a positive tuberculin skin test. Gram-positive cocci are isolated from the sputum. The patient most likely has
A) tuberculosis.
B) influenza.
C) pneumococcal pneumonia.
D) mycoplasmal pneumonia.
E) the common cold.
C
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Which of the following statements about osmoregulators is false?
A. They are restricted to environments with stable solute concentrations. B. Some organisms can switch between acting as an osmoconformer and an osmoregulator depending on environmental conditions. C. An osmoregulator uses more energy to control body fluid solute levels than an osmoconformer. D. The osmotic pressure between the inside and outside of internal cells is usually similar. E. Animals that maintain body fluid solute concentrations that are higher than that of the external environment and animals that maintain body fluid solute concentrations that are lower than that of the external environment are both considered to be osmoregulators.
Cortisol is a ____ secreted by the ____
a. amine; adrenal medulla b. glucocorticoid; adrenal cortex c. glucocorticoid; adrenal medulla d. amine; adrenal cortex e. catecholamine; adrenal glands
A useful hypothesis typically accomplishes these two things:
A. it is falsifiable and clear B. it clearly establishes a null hypothesis and it generates a testable prediction C. it can be easily disproved and will be considered a theory if not disproved D. it frames an experiment that can shed light on the observation and guides design of the experiment
Organisms in which classification do not depend on others for nutrients?
a. herbivore b. carnivore c. omnivore d. decomposer e. photosynthetic organisms