Mannokinase

The video tutorial explores mannose metabolism, highlighting its entry into glycolysis before PFK, and its role as an epimer of glucose. Mannose is converted to mannose 6-phosphate, then to fructose 6-phosphate, entering glycolysis. While not a major energy source, mannose is crucial in biosynthesis, particularly in glycoproteins.

What is the entry point of mannose in glycolysis compared to glucose?

• At the same point as glucose

• Before PFK

• After glucose isomerase

• After PFK

How does mannose differ from glucose in terms of stereochemistry?

• It is an epimer of glucose, differing at one carbon

• It is a structural isomer of glucose

• It has a different stereochemistry at two carbons

• It has the same stereochemistry as glucose

Which enzyme is responsible for converting mannose 6-phosphate to fructose 6-phosphate?

• Phosphomannose isomerase

• Hexokinase

• Aldolase

• Phosphoglucose isomerase

What is the primary role of mannose in the body?

• Major source of energy

• Biosynthesis of glycoproteins

• Main component of dietary carbohydrates

• Primary substrate for glycolysis

Which carbohydrate is the most important source of energy in the body?

• Glucose

• Mannose

• Galactose

• Fructose