Match List-I with List-II

List I		List II
A.	GLUT-4	I.	Hormone
B.	Insulin	II.	Enzyme
C.	Trypsin	III.	Intercellular ground substance
D.	Collagen	IV.	Enables glucose transport into cells

Choose the correct answer from the options given below.

The correct answer is A-IV, B-I, C-II, D-III.

To match the biological molecules in List-I with their appropriate functions or categories in List-II, we can break them down as follows:

A. GLUT-4 matches with IV (Enables glucose transport into cells):
GLUT-4 (Glucose transporter type 4) is a specialized membrane protein found primarily in skeletal muscle and adipose tissues. In response to insulin signaling, it facilitates the passive diffusion of glucose down its concentration gradient into the cells.

B. Insulin matches with I (Hormone):
Insulin is a vital peptide hormone produced and secreted by the beta cells of the pancreatic islets. It acts as the primary regulator of carbohydrate and fat metabolism in the body, lowering blood glucose levels.

C. Trypsin matches with II (Enzyme):
Trypsin is a proteolytic enzyme (protease) secreted in an inactive precursor form (trypsinogen) by the pancreas. It becomes active in the small intestine, where it catalyzes the hydrolysis of peptide bonds to digest proteins into smaller peptides.

D. Collagen matches with III (Intercellular ground substance):
Collagen is the most abundant structural protein in the animal kingdom. It forms tough, fibrous networks that constitute the primary component of the extracellular matrix, serving as an intercellular ground substance that provides structural support and strength to tissues like skin, tendons, ligaments, and bones.

Combining all the correct matches:
A → IV
B → I
C → II
D → III