The directional movement of ions by facilitated diffusion through protein channels is determined by


1. The directional movement of ions by facilitated diffusion through protein channels is determined by O the formation of a secretory vesicle O the electrochemical gradient of the ion being transported the availability of ATP 2. Simple and facilitated diffusion differ because O lons being transported by simple diffusion move along their electrochemical gradients, while ions being transported by facilitated diffusion move against their electrochemical gradients O ions being transported by simple diffusion move against their electrochemical gradients, while ions being transported by facilitated diffusion move along their electrochemical gradients O facilitated diffusion requires the presence of a transport protein within the plasma membrane, while simple diffusion does not O simple diffusion requires the presence of a transport protein within the plasma membrane, while facilitated diffusion does not 3. Changes in the membrane potential trigger the opening or closing of O mechanically-gated channels O voltage-gated channels O ligand-gated channels Prev 1 2 of 10 Score answer > 0

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QUESTION 1: The directional movement of ions by facilitated diffusion through protein channels is determined by_______. ANSWER: Option (b)- the electrochemical gradient of the ion being transported. EXPLANATION: •The directional movement of ions by facilitated diffusion through protein channels is determined by the electrochemical gradient of the ion being transported. •Facilitated diffusion is a passive process. •So the ions will move along the concentration gradient although they move through transport proteins in the plasma membrane. QUESTION 2: Simple and facilitated diffusion differ because_______. ANSWER: Option (c)- facilitated diffusion requires the presence of a transport protein within the plasma membrane, while simple diffusion does not. EXPLANATION: •Simple diffusion is the process in which ions move across the plasma membrane along the concentration gradient. •Simple diffusion doesn’t require any transport protein. •It is a passive process. It doesn’t not require any energy. •Facilitated diffusion is the process in which ions move across the plasma membrane through transport proteins along the concentration gradient. •Facilitated diffusion requires transport protein. •It is a passive process. It doesn’t require any energy. QUESTION 3: Changes in the membrane potential trigger the opening or closing of_______. ANSWER: Option (b)- voltage-gated channels. EXPLANATION: •Changes in the membrane potential trigger the opening or closing of voltage-gated channels. •These voltage-gated channels are involved in the generation of action potentials.

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