Quiz 10
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1-2. Answer with (A) amplification occurs in this step; (L) allosteric activation occurs in this step; or (I) this is an inactivation. This is for the Gs pathway. Answer with only one letter.

              AC synthesizes cAMP.

              Cyclic phosphodiesterase adds H2O to
               cAMP.

             The receptor activates Gα.

              2 C + R2 → R2C2.

              Gβγ binds Gα.

              cAMP activates PKA.

              Gα activates AC.

              PKA activates phosphorylase kinase.

3-4. Underline the Keq and ΔG°′ that describe the same reaction.
Circle a different Keq and a different ΔG°′ for two spontaneous reactions.

Keq

1 x 10−3

2.2 x 105

25

ΔG°′ (J/mol)

0

− 2.5

+ 17,000

3-4. Underline the Keq and ΔG°′ that describe the same reaction.
Circle a different Keq and a different ΔG°′ for two spontaneous reactions.

Keq

2.2 x 105

0.36

1 x 10−3

ΔG°′ (J/mol)

+ 2500

− 25

+ 12,500

3-4. Underline the Keq and ΔG°′ that describe the same reaction.
Circle a different Keq and a different ΔG°′ for two spontaneous reactions.

Keq

25

1.0

6.4 x 10−2

ΔG°′ (J/mol)

0

+ 17,000

− 30,500

3-4. Underline the Keq and ΔG°′ that describe the same reaction.
Circle a different Keq and a different ΔG°′ for two spontaneous reactions.

Keq

1 x 10−3

1.0

2.2 x 105

ΔG°′ (J/mol)

− 8,000

− 30,500

+ 2.5

5-6. Underline the two products of the unfavorable (not spontaneous) reaction if these combine in a redox reaction.

acetaldehyde + 2 H+ + 2 e−   → ethanol

E°′ = − 0.346 V

ubiquinone + 2 H+ + 2 e−   → ubiquinol

E°′ = 0.045 V

5-6. Underline the two products of the unfavorable (not spontaneous) reaction if these combine in a redox reaction.

NAD+ + 2 H+ + 2 e−   → NADH + H+

E°′ = − 0.320 V

fumarate + 2 H+ + 2 e−   → succinate

E°′ = 0.031 V

5-6. Use these two half reactions. Underline the two products for the spontaneous reaction.

NAD+ + 2 H+ + 2 e−   → NADH + H+

E°′ = − 0.320 V

oxaloacetate + 2 H+ + 2 e−   → malate

E°′ = − 0.166 V

5-6. Use these two half reactions. Underline the two products for the spontaneous reaction.

pyruvate + 2 H+ + 2 e−   → lactate

E°′ = − 0.185 V

acetaldehyde + 2 H+ + 2 e−   → ethanol

E°′ = − 0.346 V

7-10. Use (H) hexokinase; (P) PFK-1; (G) GAP dehydrogenase; or (Y) pyruvate kinase.
For most quiz versions, you were supposed to use each choice once.

              Fructose-P is its substrate.

              an oxidoreductase

              occurs during the preparation phase

              a transferase

              PEP is its substrate.

              ATP → ADP

              Fructose-1,6-bis-P is its product.

              ADP → ATP

              occurs during the payoff phase

              NAD+ → NADH

              requires HPO42− as a substrate

              Glucose is its substrate.

 

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