What is the leading hypothesis for what might have brought about the extinction of the dinosaurs?
A. Competition from mammals
B. A new disease
C. Massive volcano eruptions
D. An asteroid impact
Answer: D
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In human cells such as muscle tissue, the product of anaerobic respiration is:
A. acetic acid. B. pyruvate. C. lactic acid. D. FADH2. E. ethanol.
For an accurate diagnostic of a current infection, acute and convalescent sera should reflect a(n) _____ in the patient's antibody titer of _____ doubling dilutions
a. decrease; two b. increase; two c. decrease; four d. increase; four
These are the primary structures for sorting and shipping of proteins for export from the cell or
insertion into the cell membrane. a. Golgi bodies b. ribosomes c. mitochondria d. lysosomes e. endoplasmic reticula
Multiple sclerosis is
A) a type IV hypersensitivity disease in which cytotoxic T cells attack the myelin sheath of neurons. B) a genetic birth defect of the nervous system. C) a type II hypersensitivity to the myelin of neurons. D) the formation of antibodies against transplanted tissue. E) a neurological disease due to the accumulation of immune complexes in nerves.