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Biochemistry - Glucose Metabolism - MCAT Practice Questions
What type of proteins are responsible for moving glucose across the cell
membrane?
Glucose transporters
Where is the glucose transporter GLUT-2 primarily found?
Liver
The glucose transporter GLUT-2 is characterized by having what kind of
affinity for glucose?
Low affinity
GLUT-4 is the glucose transporter found in which two main tissues?
Adipose tissue and muscle
What type of affinity for glucose does the GLUT-4 transporter possess?
High affinity
Glycolysis is the process where one glucose molecule is broken down to form
two molecules of what acid?
Pyruvic acid
Which metabolic process converts glucose to pyruvate?
Glycolysis
The process that converts pyruvate back to glucose is known as:
Gluconeogenesis
What is the name of the process that converts glucose to glycogen for
storage?
Glycogenesis
The breakdown of glycogen back into glucose is called:
Glycogenolysis
Which of the following is NOT listed as one of the three compounds that
pyruvate will convert to?
Glycerol
When pyruvate converts to acetaldehyde, the next step converts acetaldehyde
to:
Ethanol
What is the protein complex that performs pyruvate decarboxylation and
converts pyruvate to acetyl-CoA?
Pyruvate dehydrogenase complex
Pyruvate undergoes pyruvate decarboxylation to be converted to which
molecule?
Acetyl-CoA
Acetyl-CoA feeds into the Citric acid cycle and which other major
process?
Fatty acid synthesis
Which process converts acetyl-CoA to a fatty acid?
Fatty acid synthesis
The process that converts a fatty acid to Acetyl-CoA is known as:
β-Oxidation
Amino acids undergo degradation and send which molecule to the urea
cycle?
NH₃ (Ammonia)
The citric acid cycle sends electrons to which subsequent pathway?
Electron transport chain
Glucose has 6 carbons. How many carbons does a molecule of pyruvate have?
3 carbons