Which of the following is caused by a vitamin C deficiency?
A. rickets
B. beriberi
C. scurvy
D. pellagra
E. blindness
C. scurvy
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True or false: Post-zygotic reproductive isolation may be due to either temporal or ecological separation
A. true B. false
Four of the five answers listed below are features of plasma membrane extensions. Select the
exception. a. amyloplast b. centriole c. microtubule d. basal body e. 9+2 array
Tissues of sharks are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes
What can you infer about the movement of sodium and chloride in these animals? A) To maintain homeostasis of sodium and chloride levels, the shark must take up additional sodium and chloride from seawater. B) Sodium and chloride will diffuse into shark gills from seawater down their concentration gradient. C) Sharks conserve sodium and chloride, limiting excretion. D) Sodium and chloride must be eliminated through the gills.
A plasmid that contains separate origins of replication for two different species is called a(n) _________
A. R factor B. expression vector C. viral vector D. shuttle vector