Singapore GCE A-Level H3 Biology Practice Questions - Singapore GCE A-Level H3 Biology Examination (SEAB Syllabus 9816) Exam

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What intrinsic enzyme activity enables the Gα subunit of a heterotrimeric G-protein to terminate its own signalling cascade?

Intrinsic GTPase activity that hydrolyzes bound GTP to GDP Phosphodiesterase activity that converts cAMP into 5'-AMP Protein phosphatase activity that dephosphorylates effector protein kinases Adenylate cyclase activity that synthesizes cyclic GMP from GTP

Correct Answer:

Intrinsic GTPase activity that hydrolyzes bound GTP to GDP

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