From the picture above ; A. Explain the exact process of how these molecules cro
ID: 924898 • Letter: F
Question
From the picture above ;
A. Explain the exact process of how these molecules cross via simple diffusion .
B. Explain the exact process of how these molecules cross via active transport.
C. What is the same about how molecules cross via simple diffusion versus active transport.
D. What is the different about the molecules cross via simple diffusion versus active transport.
E. Additional give one example of a molecule that can go cross the cell membrane via active transport.
Please please help answer A to E. Thank u
Explanation / Answer
A) in simple diffusion materials move from its region of high concentration to low concentration (in the direction of the concentration gradient ) without using any energy source like ATP. Once the rate of diffusion reaches its maximum value,no further increase in concentration affects the rate of diffusion as the channels of transport for particles is saturated.
B) In active transport or so called facilitated diffusion the molecules are transported across the channels using energy in the form of ATP.In active transport , molecules may be moved with and against a concentration gradient.Membrane proteins like carrier proteins and channel proteins helps in moving material through the phospholipid bilayer of cell membrane.
While carrier protein, binds to the molecule top transport it across the membrane, channel proteins creates pathway for molecules to pass through it.
C)in simple diffusion the molecules only move in the direction of concentration gradient.No facilitator protein assists in the transport of molecules through the membrane and no source of ATP is required.The kinetic energy and natural entropy of molecules are the factors that leads to the their transport.
D)However , in active transport,cellular energy (ATP ) is used up to move the molecules against concentration gradient, polar repulsion or other resistances like hydrophophicity nature of phospholipids for hydrophilic molecules
E)Na+ or sodium ions are transported out of the cell and K+ ions into the nerve cell by Na-K pump by active transport
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