Question

Passive transport; recognize examples of facilitated diffusion. Summarize the critical steps in the facilitated diffusion of glucose.

Ch 4 obj 13

Answer 1

Facilitated diffusion is a type of passive transport that requires specific membrane receptors or channel proteins. In the facilitated diffusion of glucose, glucose molecules move down their concentration gradient through carrier protein channels in the membrane.

Step-by-step explanation:

Facilitated diffusion is a type of passive transport in which specific membrane receptors or channel proteins are required for the movement of substances down their concentration gradient.

Examples of substances that are transported through facilitated diffusion include glucose and certain ions such as Na+.

In the facilitated diffusion of glucose, glucose molecules move down their concentration gradient through carrier protein channels in the plasma membrane.

The critical steps in the facilitated diffusion of glucose involve the binding of glucose to the carrier protein, a change in the protein's conformation, and the release of glucose on the other side of the membrane

Answer 2

Facilitated diffusion is a form of passive transport that involves the movement of substances across a cell membrane through specific protein channels or carriers.

Step-by-step explanation:

Passive transport, including facilitated diffusion, is a process that does not require energy input and relies on the natural movement of particles from areas of higher concentration to lower concentration. Facilitated diffusion specifically involves the assistance of protein channels or carriers in transporting substances that may not easily pass through the lipid bilayer of the cell membrane.

In the facilitated diffusion of glucose, critical steps include the recognition of glucose molecules by specific carrier proteins embedded in the cell membrane. These carrier proteins undergo conformational changes upon binding to glucose, allowing the glucose molecules to be transported across the membrane. This process is highly specific, ensuring that only glucose molecules, or molecules with a similar structure, are transported. The movement of glucose occurs down its concentration gradient, from an area of higher concentration to lower concentration, ensuring that the process is in line with passive transport principles.

Understanding facilitated diffusion is essential for comprehending how cells regulate the movement of important molecules like glucose. This process enables cells to selectively transport substances, maintaining proper balance and functionality within the cellular environment.