Individuals with familial Down syndrome are trisomic and have 47 chromosomes
Indicate whether the statement is true or false
FALSE
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A stroke may occur when
a. a vessel in the brain ruptures. b. a vessel in the heart ruptures. c. a vessel in the brain is blocked by a clot. d. a vessel in the heart is blocked by a clot. e. a vessel in the heart ruptures, and a vessel in the brain is blocked by a clot
Ciliated gills in clams, sharks continuously swimming with their mouths partly open, countercurrent flow of blood and water in fish gills, and the use of air sacs to effect unidirectional flow of air through bird lungs are all adaptations that optimize what factor in the formula for Fick's law of diffusion?
A. A B. d C. ?p D. D
Which one of the following statements about cyanobacteria is false?
A) Although cyanobacteria are photosynthetic, they do not produce oxygen as a result of photosynthesis. B) At one time, cyanobacteria were called blue-green algae. C) Some cyanobacteria are capable of nitrogen fixation.
With ____ selection, the frequency of the mean phenotype decreases while the frequencies of extreme phenotypes
increase.
a. directional b. stabilizing c. disruptive d. sexual e. dominant