Which one of the following is not a cell surface-type receptor?
A. G protein-coupled receptor
B. steroid receptor
C. ligand-gated receptor
D. receptor kinase
B
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Which structure surrounds and protects the brain in all vertebrates?
a. pharynx b. neural crest c. oral hood d. notochord e. cranium
In vertebrates, neural crest cells give rise to the nerves, head muscles, and cranium. Indicate whether the statement is true or false
Research shows that sex education is
A. largely responsible for the high incidence of teenage pregnancy in the United States.B. being shoved down the throats of American teenaers against the will of American taxpayers. C. more detailed in Iran than in the United States. D. immoral
A patient complains that his teeth are loose and his gums bleed easily. The doctor believes that due to poor diet, the patient has scurvy, a vitamin C deficiency. Vitamin C is required to produce collagen which provides mechanical and structural support for tissue. This structural support is known as the:
What will be an ideal response?