Osteoporosis sometimes results from
a. excessive PTH secretion.
b. insufficient PTH secretion.
c. excessive intake of vitamin D.
d. excessive intake of iodine.
e. insufficient intake of vitamin D.
A
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Messenger RNAs containing premature stop codons are destroyed by the mechanism of
A) nonstop decay. B) directed RNase activity. C) nonsense-mediated decay. D) error-mediated repair. E) None of these mechanisms.
The ratio of which isotopes in foramnifera shells correlates directly with the temperature when that shell was formed?
What will be an ideal response?
________ isolating mechanisms are outside factors that prevent interbreeding
A) Behavioral B) Mechanical C) Extrinsic D) Intrinsic
What is true of a fossil that is classified as a "transitional form"?
A. It has all of the traits of its ancestors and all of the traits of its descendants. B. It has all of the traits of its ancestors and some of the traits of its descendants. C. It has some of the traits of its ancestors and all of the traits of its descendants. D. It has some of the traits of its ancestors and some of the traits of its descendants.