Which of the following is not an example of active transport?
I. Facilitated diffusion
II Osmosis Note:
The four main kinds of passive transport are diffusion, facilitated diffusion, filtration and osmosis.
Passive transport means moving biochemicals and other atomic or molecular substances across membranes. [ Unlike active transport, this process does not involve chemical energy, because, unlike in an active transport, the transport across membrane is always coupled with the growth of entropy of the system. So passive transport is dependent on the permeability of the cell membrane, which, in turn, is dependent on the organization and characteristics of the membrane lipids and proteins. The four main kinds of passive transport are diffusion, facilitated diffusion, filtration and osmosis.
is osmosis the only one?Weegy:
No they all are passive transoport. [ Osmosis is the diffusion of water through a semi-permeable membrane, from a solution of low solute concentration (high water potential) to a solution with high solute concentration (low water potential), up a solute concentration gradient. ] Note:
The action of the sodium-potassium pump is an example of primary active transport.Active transport is the movement of a substance against its concentration gradient (from low to high concentration). [ In all cells, this is usually concerned with accumulating high concentrations of molecules that the cell needs, such as ions, glucose, and amino acids. If the process uses chemical energy, such as from adenosine triphosphate (ATP), it is termed primary active transport. Secondary active transport involves the use of an electrochemical gradient. Active transport uses energy, unlike passive transport, which does not use any type of energy. Active transport is a good example of a process for which cells require energy. Examples of active transport include the uptake of glucose in the intestines in humans and the uptake of mineral ions into root hair cells of plants.
Do you have another question now?
All Categories|No Subcategories|Expert answered|Rating 0| 3/2/2011 11:41:23 AM