Question

The enzyme N-acetylglucosamine phosphotransferase is responsible for ____________

(a) mannose phosphorylation

(b) sucrose phosphorylation

(c) tethering Golgi stack

(d) modification of integral proteins

I had been asked this question in an international level competition.

I'm obligated to ask this question of Cytoplasmic Membrane Systems topic in chapter Cytoplasmic Membrane Systems of Cell Biology

Answer 1

Right choice is (a) mannose phosphorylation

To explain I would say: Mannose 6-phosphate residues are present on the lysosomal enzymes that direct these proteins to the lysosomes after their synthesis from Golgi complex.  N-acetylglucosamine phosphotransferase adds the mannose residues on lysosomal enzymes.