Question

In: Biology

Which of the following net forward reactions require the net input of the energy (not shown)...

Which of the following net forward reactions require the net input of the energy (not shown) of at least one high-energy phosphate bond?

A.

ribose-5 phosphate à PRPP
B.

HCO3 + NH4+ à Structure F :
C.

oxaloacetate + Structure C à aspartate + alpha-ketoglutarate

Structure C:
D.

Guanine à GMP
E.

Glucose-6-phosphate + 2 NADP+ à ribose-5-phosphate + 2 NADPH
F.

ATP + GDP à ADP + GTP

Solutions

Expert Solution

Answer F

ATP + GDP à ADP + GTP

In gluconeogenesis, two high-energy phosphate bonds are consumed (ATP→ADP+Pi; GTP→GDP+Pi) in reversing the reaction.

Gluconeogenesis begins when pyruvate, generated in the cytosol, is transported into the mitochondrion through the action of a specific carrier and converted to oxaloacetate.

Acetyl CoA, Mg2+

Pyruvate- + HCO3- + ATP4-  ----------------------------------------> Oxaloacetate 2-  + ADP3- + Pi2- + H+

pyruvate carboxylase

The second reaction is the conversion of oxaloacetate to phosphoenolpyruvate. In this reaction, inosine triphosphate (ITP) can substitute for guanosine triphosphate (GTP) and the CO2 lost is the one gained in the carboxylase reaction.

  PEPCK

Oxaloacetate 2- + GTP4-  or (ITP4- ) ---------------------------------> Phosphoenol pyruvate3-  + CO2 + GDP3- or (IDP3- )

PEPCK - Phosphoenol pyruvate carboxykinase

gladiator answered 2 years ago
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