Question
What is the first event after a ligand binds a GPCR?
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Answer
The receptor changes conformation.
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Question
Thyroid hormone vs. catecholamines: how do these two amino-acid-derived hormones differ mechanistically?
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Answer
Thyroid hormone is lipophilic and intracellular; catecholamines are hydrophilic and use surface GPCRs.
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Question
Which fat-soluble vitamin named here is a steroid derivative rather than a terpenoid?
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Answer
Vitamin D.
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Question
What structural feature defines a steroid?
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Answer
A four-ring steroid nucleus: three six-membered and one five-membered fused rings.
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