Which enzyme is responsible for initiating glycogenesis?

• Glycogen phosphorylase

• Glycogenin

• Glycogen synthase

• Hexokinase

Which molecule donates glucose units in glycogenesis?

• Glucose-6-phosphate

• UDP-glucose

• Fructose-1-phosphate

• Glucose-1-phosphate

Which enzyme introduces branches in glycogen?

• Branching enzyme

• Debranching enzyme

• Glycogen synthase

• Glycogen phosphorylase

Which enzyme breaks α-1,4 glycosidic bonds in glycogenolysis?

• Glycogen synthase

• Glycogen phosphorylase

• Branching enzyme

• Glucokinase

Which hormone activates glycogenolysis?

• Insulin

• Glucagon

• Somatostatin

• Calcitonin

Which second messenger mediates glycogen phosphorylase activation?

• IP3

• cAMP

• cGMP

• DAG

What is the function of 2,3-BPG in RBCs?

• Inhibits glycolysis

• Binds hemoglobin to increase O2 affinity

• Enhances oxygen release from hemoglobin

• Acts as buffer

The Rapoport-Luebering cycle bypasses which enzyme of glycolysis?

• Hexokinase

• Phosphofructokinase

• Phosphoglycerate kinase

• Pyruvate kinase

Which of the following is an epimer of glucose?

• Ribose

• Fructose

• Galactose

• Deoxyribose

Epimers differ in configuration around:

• All carbon atoms

• Only at the aldehyde group

• Only at one specific carbon atom

• More than one carbon atom