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G Protein Quiz

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Questions and Answers

Which type of G protein activates adenylyl cyclase when certain ligands bind to specific GPCRs on the cell membrane?

G12

Gs (correct)

When an agonist binds to a Gs-coupled receptor, what happens to the G protein?

The G protein exchanges its bound GDP for a GTP molecule (correct)

The G protein activates adenylyl cyclase

The G protein dissociates from the beta-gamma subunits

The G protein exchanges its bound GTP for a GDP molecule

Which subunit of the Gs protein dissociates from the beta-gamma subunits when activated?

Gamma subunit (γ)

Delta subunit (δ)

Beta subunit (β)

Alpha subunit (αs) (correct)

What is the main effect of the activated Gs protein on adenylyl cyclase?

Stimulation (A) Signup and view all the answers

Which type of G protein inhibits adenylyl cyclase when certain ligands bind to specific GPCRs on the cell membrane?

Gi (C) Signup and view all the answers

When an agonist binds to a Gi-coupled receptor, what happens to the G protein?

The G protein exchanges its bound GDP for a GTP molecule (C) Signup and view all the answers

Which subunits of the Gi protein work together to inhibit adenylyl cyclase?

Alpha subunit (αi) and beta-gamma subunits (D) Signup and view all the answers

What is the main effect of the activated Gi protein on adenylyl cyclase?

Inhibition (B) Signup and view all the answers

Which type of G protein activates phospholipase C when certain ligands bind to specific GPCRs on the cell membrane?

Gq (D) Signup and view all the answers

Which type of G protein is not mentioned in the provided text?

G12 (C) Signup and view all the answers