Question

Use the following diagram to answer the questions. The diagram illustrates a member of the β-adrenergic family of receptors (that bind adrenaline) and the molecules involved in its signaling pathway. Binding of adrenaline to its receptor results in the formation of cAMP. Each shape is a protein or nucleotide.

Extracellular Space Plasma Membrane Cytoplasm

A G protein-coupled receptor

           Select shape from A-E   

A subunit in a heterotrimeric G protein

  Select shape from A-E   

An enzyme whose physiological substrate is ATP

  Select shape from A-E   

ATP

Select shape from A-E    

Adenyly cyclase

Select shape from A-E   

A protein that may be modified by cholera toxin

Select shape from A-E   

Answer 1

The given image represents Beta-adrenergic receptor signalling cascade.
The black dot = Epinephrine
A = Beta adrenergic receptor
B = Alpha subunit of hetero trimeric G-protein
C = Adenylate cyclase
D = ATP
E = cAMP