The problem requires matching elements from List I with corresponding elements in List II based on function or characteristics:
- GLUT-4: A glucose transporter in adipose and striated muscle tissues that facilitates glucose transport into cells. This matches IV: "Enables glucose transport into cells".
- Insulin: A hormone regulating blood glucose levels, stimulating glucose uptake by fat, liver, and skeletal muscle cells. This corresponds to I: "Hormone".
- Trypsin: An enzyme aiding protein digestion in the small intestine. This matches II: "Enzyme".
- Collagen: A structural protein in connective tissues providing cellular support. This corresponds to III: "Intercellular ground substance".
The correct matching is: A-IV, B-I, C-II, D-III.