Which of the following statements regarding the general concepts of metabolism is true?
A)once glucose is converted to pyruvate, there is no way to convert pyruvate back to glucose
B)when triacylglycerols are used as fuel, only the fatty acids can be metabolized, the glycerol is a waste product
C)amino acids serve as substrates for many pathways including glycolysis and the citric acid cycle
D)the citric acid cycle is generally considered an anabolic pathway while gluconeogenesis is generally considered a catabolic pathway
E)none of the above

Question

Quizplus · Accepted Answer

Amino acids can be used as substrates for both catabolic and anabolic pathways. For example, they can be broken down in the citric acid cycle to generate energy, or used to build proteins through anabolic pathways. Option A is false because pyruvate can be converted to glucose through gluconeogenesis. Option B is false because glycerol can also be used as a substrate for fuel metabolism. Option D is false because the citric acid cycle is catabolic, breaking down molecules to generate energy, while gluconeogenesis is anabolic, synthesizing glucose from non-carbohydrate sources.

Which of the Following Statements Regarding the General Concepts of Metabolism