Facilitated diffusion

Facilitated diffusion - Facilitated diffusion---substance...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Facilitated diffusion---substance to be transported combines with a plasma membrane carrier protein called a transporter. Transporters are specific to one substance. As the substance molecule moves into the open end of the transporter molecule, its presence causes the carrier molecule to change shape. The open end of the carrier in now on the inside of the cell, so the substance moves on in. The carrier releases the substance and returns to the original shape, ready to repeat the process. Movement can continue as long as the substance is moving from higher concentration to lower concentration. d) Passive processes are less important in bacterial cells than in eukaryotic cells. One reason is that bacterial cells frequently find themselves in surroundings where nutrients are in low concentration, so passive processes are unable to meet their needs. Another point is that only concentration, so passive processes are unable to meet their needs....
View Full Document

This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

Page1 / 2

Facilitated diffusion - Facilitated diffusion---substance...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online