To facilitate respiration, birds have extensions of their lungs called __________, which reach into all
parts of their bodies.
a. tracheal tubes
b. spiracles
c. air bladders
d. parabronchi
e. air sacs
E
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Of the following species, which are widely distributed in nature and hospital environments?
a. Pseudomonas luteola b. Acinetobacter spp. c. Pseudomonas oryzihabitans d. Bordetella trematum
Which is NOT a typical site for the occurrence of
meiosis? a. plant ovary b. plant root cells c. human testis d. human ovary e. plant anther
Why do mammals adapted to dry climates tend to have considerably more long-looped nephrons than those adapted to wet climates?
A) So that their blood pressure does not drop to dangerously low levels during periods of drought B) So that a lower concentration of salt can be produced in the interstitial fluid of the kidney medulla, causing less water to be reabsorbed into the capillaries C) So that the wastes can be excreted as uric acid instead of urine D) So that the excess urea they produce as a result of dehydration can be properly filtered by the nephrons and excreted E) So that a higher concentration of salt can be produced in the interstitial fluid of the kidney medulla, causing more water to be reabsorbed into the capillaries
Which of the following types of radiation is nonionizing and has the shortest wavelength?
A) ultraviolet light B) infrared radiation C) microwaves D) X rays E) gamma rays