Organisms use carbohydrates in all of the following ways EXCEPT
A. as a component of cell walls.
B. as a long-term energy source.
C. as a short-term energy source.
D. to keep membranes flexible at low temperatures.
E. as a building block of DNA and RNA molecules.
Answer: D
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Which of the following are living representatives of the first plant lineages to diverge after plants moved onto land?
A. angiosperms B. gymnosperms C. ferns D. bryophytes E. lycophytes
A 15-year-old male was diving in a lake when he inhaled some of the stagnate water. Five days later he was admitted to the hospital, comatose, and in critical condition. A cerebrospinal fluid (CSF) specimen was taken, and several motile amoebae were observed. The patient would most likely be diagnosed with which of the following conditions?
a. Granulomatous amebic encephalitis b. Primary amebic meningoencephalitis c. Secondary amebic encephalitis d. Chronic granulomatous meningitis
The apparatus in the figure was used by Stanley Miller and Harold Urey to study the origin of life on Earth. What compound was excluded from the apparatus so that it would form a reducing atmosphere?
A. CO2
B. O2
C. NH3
D. H2
E. H2O
What features would enable a doctor to distinguish conclusively between the proliferative and secretory phases of the uterine cycle?
_____ the ratio of estradiol to progesterone _____ ratio of FSH to LH _____ thickened endometrium _____ presence of endometrial glands _____ loss of the endometrium