Question

define facilitated diffusion: the passive movement of molecules across the cell membrane with the help of transport
transport proteins called ________________ or ________________ move molecules across the cell during facilitated diffusion.
does facilitated diffusion require energy? __________________
does the concentration gradient play a role in facilitated diffusion? __________________
station four: active transport
instruction: read the below information provided and answer the following questions at the end of the text.
what happens when you are trying to get from the west wing to the gym? is it easier to move with the crowd or against the crowd? have you ever been on a slide at a playground? does it take more energy to climb the stairs to get to the top or to actually slide to the bottom? what does it mean to you to be “active?” when you are moving against something, or climbing up stairs, you are actively using energy to get the task done.
sometimes a cell needs to use energy to move molecules against the concentration gradient to where they are needed. this is like pushing against the crowd on main street. molecules are moved from an area of low concentration to an area of high concentration. this is called active transport, because it takes energy to actively move molecules against the concentration gradient.
energy is also required if the cell needs to take in or release large bulky materials. the molecules would be too large to pass through the cell membrane on their own. let’s look at two processes used in moving these kinds of large, bulky materials. in science, root words (prefixes and suffixes) are helpful in figuring out the meaning of words.
for example: the root word endo- means “into,” exo- means “out of” and cyto- means “cell.”
during the process of endocytosis, energy is used to move large, bulky materials into the cell. these molecules are engulfed by an enfolding cell membrane that surrounds and closes up around the large, bulky materials. the cell enfolds and pinches off inside of the cell creating a vacuole or “pocket of materials.”
during the process of exocytosis, energy is used to move large, bulky materials out of the cell. materials can be broken down inside a vacuole in the cell. materials that are not used by the cell are removed as wastes.
define the term active transport: __________________
why does active transport require energy to transport materials? __________________

Explanation:

Facilitated diffusion is the passive movement of molecules across the cell membrane with the help of transport proteins. These proteins are channel - proteins or carrier - proteins. It is passive, so no energy is required, and it occurs along the concentration gradient. Active transport is the movement of molecules from an area of low concentration to an area of high concentration, which requires energy as it is against the concentration gradient.

Answer:

Define facilitated diffusion: The passive movement of molecules across the cell membrane with the help of transport proteins called channel - proteins or carrier - proteins.
Does facilitated diffusion require energy? No.
Does the concentration gradient play a role in facilitated diffusion? Yes.
Define the term Active Transport: The movement of molecules from an area of low concentration to an area of high concentration, requiring energy.
Why does Active Transport require energy to transport materials? Because it moves molecules against the concentration gradient.