Which hormone is responsible for the development of secondary sex characteristics in females?
a. estrogen only
b. progesterone only
c. estrogen and progesterone
d. oxytocin
a. estrogen only
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Bilateral symmetry is characteristic of a(n)
a. cnidarian b. roundworm c. echinoderm d. corals e. flatworm
Fungal infections are difficult to treat because
A. they mutate very rapidly and therefore become resistant to most medications. B. fungal and human cells are so similar that it is difficult to make fungal medications that do not harm human cells. C. they "hide out" inside of cells, and have long latent periods where medications can not get to the organism. D. All of the answer choices are correct.
?Birds are evolved from reptiles, but also differ dramatically. Which features of birds differentiate them from most reptiles?
What will be an ideal response?
In most cases protein kinases
a. polymerize amino acids b. hydrolyze proteins c. stimulate adenylyl cyclase d. bind cGMP e. add phosphate groups to proteins