M. Pharmacy Quiz-3

Which of the following is a second messenger involved in signal transduction?

G-protein

Tyrosine kinase

cAMP

Adenylyl cyclase

What is the primary function of G-protein coupled receptors (GPCRs)?

Phosphorylate substrates

Act as enzymes

Transduce extracellular signals via G-proteins

Directly open ion channels

Which enzyme is responsible for the phosphorylation of proteins in signal transduction pathways?

Phospholipase C

Protein kinase

Adenylyl cyclase

GTPase

What is the role of tyrosine kinase receptors in cellular pharmacology?

They directly bind to DNA

They open ligand-gated ion channels

They autophosphorylate upon ligand binding

They degrade second messengers

Which of the following best describes the mechanism of action of monoclonal antibodies in cancer therapy?

Inhibiting DNA synthesis

Blocking cell surface receptors

Enhancing G-protein activation

Stimulating neurotransmitter release

M. Pharmacy Quiz-3

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