11. What happens next after the hormone glucagon binds to a G-protein coupled receptor (GPCR)? (A) The G-protein loses GDP and gains GTP becoming activated. (B) The G-protein loses GTP and gains GDP becoming activated. (C) The G-protein loses GDP and gains GTP becoming inactivated. (D) The G-protein loses GTP and gains GDP becoming inactivated.

17. Wild type bread mold can grow in a minimal medium without supplements, while certain mutated strains can only grow in a minimal medium that is supplemented with specific intermediates. See the figure below for an overview of the arginine biosynthetic pathway. A strain that can grow in a minimal medium containing arginine, but NOT in minimal media containing citrulline nor in minimal media containing ornithine would have a mutation in the gene that encodes for ________. Precursor $\xrightarrow{\text{Enzyme 1}}$ Ornithine $\xrightarrow{\text{Enzyme 2}}$ Citrulline $\xrightarrow{\text{Enzyme 3}}$ Arginine(A) enzyme 1. (B) enzyme 2. (C) enzyme 3. (D) both enzymes 1 and 3.

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