In ________ and ________, no energy is used. Which one needs a helper to get things across? ________
Answer (3)
Passive transport does not require energy and occurs when substances move naturally from an area of higher concentration to an area of lower concentration. On the other hand, active transport requires energy and moves molecules against their concentration gradient. ATP (adenosine triphosphate) is the form of energy used in active transport. ;
In DIFFUSION AND FACILITATED DIFFUSION no energy is used. The one that needs a helper to get thing across is FACILITATED DIFFUSION. Facilitated diffusion involves the diffusion of materials across the cell plasma membrane with the aid of membrane proteins such as carriers and channels. The process of diffusion does not need a carrier, the molecules to be transported just move on their own from the area of high concentration to the region of low concentration until the concentration in the space become uniform.
Facilitated diffusion and diffusion are types of passive transport that do not use energy. While diffusion occurs without any assistance, facilitated diffusion requires specific proteins to help transport larger or polar molecules across the cell membrane. An example of facilitated diffusion includes the movement of glucose into cells with the help of carrier proteins.
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