A patient's karyotype indicates a chromosome number of 45. This result is best explained by
A. nondisjunction in either the sperm cell or oocyte.
B. fertilization of a single oocyte by two sperm cells.
C. a point mutation that caused one or more chromosomes to fuse.
D. nondisjunction in both the sperm cell and oocyte.
Answer: A
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During cell division, the chromosomes did not separate properly. This likely means that the centrioles failed to attach to what structure?
A. Microtubules B. Cilia C. Nucleus D. Centrosome
Protective reflexes of the lungs include
A) bronchoconstriction. B) coughing and bronchoconstriction. C) coughing. D) bronchodilation. E) bronchodilation and coughing.
The active transport of solutes out of the blood and into the tubular fluid is called
A. titration. B. fenestration. C. filtration. D. tubular reabsorption. E. tubular secretion.
During digestion, the concentration of hydrogen ions (H+) in the stomach contents increases to many times that in cells lining the stomach. Which transport process could be responsible?
A) osmosis B) simple diffusion C) facilitated diffusion D) active transport E) exocytosis