Question

for glucose to enter a cell, it needs a glucose ____, which is a doorway in the cell wall that glucose can pass through, and the hormone ____, which acts as a key that unlocks and opens the glucose doorways. multiple choice gatekeeper, insulin transporter, thyroxine gatekeeper, thyroxine transporter, insulin

Explanation:

Glucose enters cells through glucose transporters, which are membrane - bound proteins acting as doorways. Insulin is the hormone that unlocks these transporters to allow glucose entry. Thyroxine is not involved in this process.

Answer:

D. transporter; insulin