Unfortunately, several of the children who were genetically treated for SCID-X1 have since developed
a. sickle cell anemia.
b. diabetes.
c. cystic fibrosis.
d. hemophilia.
e. leukemia.
E
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Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?
A) Enzymatic activity was proportional to the amount of calcium added to a cell-free extract. B) Receptor studies indicated that epinephrine was a ligand. C) Glycogen breakdown was observed only when epinephrine was administered to intact cells. D) Glycogen breakdown was observed when epinephrine and glycogen phosphorylase were combined. E) Epinephrine was known to have different effects on different types of cells.
The descriptive term ectotherm, when applied to reptiles, refers to the fact that:
a. they are warm-blooded b. they derive their body heat from outside of their body by certain behaviors c. their central body core works best when its temperature is the same as the ambient temperature d. their optimum temperature for muscle contraction occurs only when the sun provides direct solar heat e. they maintain their temperature by adjusting the production of metabolic heat
As predators feed on prey, prey abundances decrease over time. This is predicted to result in a(n)
A) increase in predator abundance. B) decrease in predator abundance. C) no change in predator abundance. D) increase in predator size.
Mycetoma is
A. also called athlete's foot. B. a subcutaneous infection that looks like a tumor. C. only seen in the Midwest. D. caused by dermatophytes. E. All of the choices are correct.