Which of the following are reasons that glucose is a common metabolic fuel used by living organisms?
A) In its stable ring structure, glucose is unlikely to nonezymatically glycosylate proteins.
B) It is one of the fuels formed under prebiotic conditions, thus available for primitive biochemical systems.
C) It is the only sugar used by the brain and kidney as a fuel source.
D) It is a ketose and thus a nonreducing sugar.
E) Both A and B are correct.

Question

Quizplus · Accepted Answer

Glucose's stable ring structure makes it less likely to glycosylate proteins nonenzymatically, preserving protein function, and its presence in prebiotic conditions suggests it was readily available for early life forms, making A and B correct. Glucose is not the only sugar used by the brain and kidneys, and it is an aldose, not a ketose, making it a reducing sugar, which invalidates C and D.

Which of the Following Are Reasons That Glucose Is a Common