Final answer:
SGLT is an example of active transport because it uses energy to transport glucose against its concentration gradient in a process called symport, whereas GLUT is involved in facilitated diffusion, which does not require energy.
Step-by-step explanation:
An example of active transport is SGLT (Sodium-GLucose Transporter), which is involved in the absorption of glucose against its concentration gradient. SGLT functions as a symporter, coupling the transport of glucose with that of sodium ions (Na+). The sodium ions move down their electrochemical gradient, which is maintained by the Na+/K+ ATPase pump that uses energy in the form of ATP to pump sodium out and potassium in, into the cell. This energy allows glucose to also enter the cell, moving against its concentration gradient. Conversely, the GLUT protein facilitates the transport of a single substance, glucose, through a process called facilitated diffusion, which does not require energy.