The reaction of the citric acid cycle that produces an ATP equivalent （in the form of GTP） by substrate level phosphorylation is the conversion of（）
A. succinyl-CoA to succinate
B. citrate to isocitrate
C. fumarate to malate
D. succinate to fumarate
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In comparison with the resting state, actively contracting human muscle tissue has a（）
A. higher concentration of ATP
B. higher rate of lactate formation
C. lower consumption of glucose
D. lower rate of consumption of oxygen
An enzyme used in both glycolysis and gluconeogenesis is（）
A. 3-phosphoglycerate kinase
B. glucose 6-phosphatase
C. hexokinase
D. phosphofructokinase-1
Conversion of 1 mol of acetyl-CoA to 2 mol of CO2 and CoA via the citric acid cycle results in the net production of（）
A. 1 mol of citrate
B. 1 mol of FADH2
C. 1 mol of NADH
D. 1 mol of oxaloacetate
In humans, gluconeogenesis（）
A. can result in the conversion of protein into blood glucose
B. helps to reduce blood glucose after a carbohydrate-rich meal
C. is essential in the conversion of fatty acids to glucose
D. requires the enzyme hexokinase
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