AP BIOLOGY

Detailed explanation-1: -In the active transport, substances (e.g. ions, glucose, and amino acids) move across a membrane from a region of their lower concentration to a region of their higher concentration. Thus, they move against the direction of their concentration gradient.

Detailed explanation-2: -Answer and Explanation: Glucose moves into the cell against its concentration gradient by active transport also known as facilitated diffusion. Glucose plays an active part in its active transport into the cell. sodium ion binds to a receptor in the membrane of the cell and glucose binding is also involved.

Detailed explanation-3: -Glucose tends to move from an area of high concentration to an area of low concentration, a process called diffusion. Because the glucose transporter works with the concentration gradient, its process of moving glucose across the cell membrane is called facilitated diffusion.

Detailed explanation-4: -In the intestine and renal proximal tubule, glucose is transported against a concentration gradient by a secondary active transport mechanism in which glucose is cotransported with sodium ions.

Detailed explanation-5: -During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.