Holt-Oram syndrome (HOS) is an autosomal dominant condition characterized in part by upper limb malformations. The most likely cause of this disorder would be a mutation in a Pax6 gene.
Answer the following statement true (T) or false (F)
False
A mutation in a Pax6 gene may lead to the failure of eye development in an animal. A mutation in a Tbx5 gene could lead to malformations in limb development.
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Which of the following changes would be expected to cause vasoconstriction in an arteriole?
A. increases in carbon dioxide B. increases in lactic acid C. increases in potassium ion concentration D. decreases in pH E. None of the changes listed for this question would cause vasoconstriction.
The most significant role played by pH buffers is to
A. prevent fluctuations in the acidity of solutions. B. increase the strength of acids and bases. C. prevent fluctuations in the salinity of solutions. D. limit major shifts in the amount of H+ and OH- in solution. E. keep pH low.
In humans, body size, muscle mass, and patterns of fat distribution are types of ____ sex characteristics
a. primary b. secondary c. tertiary d. initial e. mutable
Traditionally, most ecologists have assumed that community stability is a consequence of:
a. competition. b. predation. c. community complexity. d. the relative size of realized niches among species. e. disease.