transport – diffusion and facilitated diffusion
date:
1. why is diffusion considered a type of passive transport?
a. it moves materials across a cell membrane
b. it does not require energy from the cell
c. it does not need to be activated by an enzyme
2. how do molecules move during diffusion
a. from an area of higher concentration to an area of lower concentration
b. across a cell membrane with the use of cellular energy
c. from an area of lower concentration to an area of higher concentration
d. against the concentration gradient
3. which form of cellular transport is shown in the image below?
image of cell membrane with protein channel, carrier proteins, extracellular space, intracellular space
a. osmosis
b. active transport
c. simple diffusion
d. facilitated diffusion
4. in diffusion, how to molecules move with respect to the concentration gradient?
a. down the gradient
b. against the gradient
c. without the gradient
d. up the gradient
5. how are facilitated diffusion and simple diffusion different from each other?

Question

transport – diffusion and facilitated diffusion
date:
1. why is diffusion considered a type of passive transport?
   a. it moves materials across a cell membrane
   b. it does not require energy from the cell
   c. it does not need to be activated by an enzyme
2. how do molecules move during diffusion
   a. from an area of higher concentration to an area of lower concentration
   b. across a cell membrane with the use of cellular energy
   c. from an area of lower concentration to an area of higher concentration
   d. against the concentration gradient
3. which form of cellular transport is shown in the image below?
   image of cell membrane with protein channel, carrier proteins, extracellular space, intracellular space
   a. osmosis
   b. active transport
   c. simple diffusion
   d. facilitated diffusion
4. in diffusion, how to molecules move with respect to the concentration gradient?
   a. down the gradient
   b. against the gradient
   c. without the gradient
   d. up the gradient
5. how are facilitated diffusion and simple diffusion different from each other?

Accepted Answer

### Question 1
# Brief Explanations:
Passive transport is defined as the movement of substances across a cell membrane without the use of cellular energy (ATP). Diffusion does not require energy from the cell (option b is incorrect as moving across the membrane is not the defining factor for passive transport; option c is incorrect as enzymes are not related to passive transport classification; option a is part of it but the key is energy). So the correct reason is it does not require energy from the cell? Wait, the options: a is moves materials across membrane (true for all transport), b is no energy (passive transport is energy - free), c is no enzyme activation (not related to passive transport definition). So the correct option for question 1 is b? Wait, the original marked is c? Wait, no, let's re - analyze. Passive transport: diffusion is passive because it doesn't need cell energy. So the question is "Why is diffusion considered a type of passive transport?". The correct answer is that it does not require energy from the cell (option b). But the marked in the image is c. Wait, maybe I misread. Let's check the options again:

a. It moves materials across a cell membrane – active transport also moves materials, so not unique.

b. It does not require energy from the cell – this is the definition of passive transport.

c. It does not need to be activated by an enzyme – enzymes are for catalysis, not transport type.

d. (Wait, the original question's options: a, b, c? Wait the image shows:

1. Why is diffusion considered a type of passive transport?

a. It moves materials across a cell membrane

b. It does not require energy from the cell

c. It does not need to be activated by an enzyme

So the correct answer is b. But the marked in the image is c. Maybe a mistake in the marking. But according to the concept, passive transport is energy - free, so answer is b.

# Answer:
b. It does not require energy from the cell

### Question 2
# Brief Explanations:
Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration (down the concentration gradient). Option b is across membrane with cellular energy (that's active transport), option c is lower to higher (active transport), option d is against gradient (active transport). So the correct option is a.

# Answer:
a. From an area of higher concentration to an area of lower concentration

### Question 3
# Brief Explanations:
Facilitated diffusion uses protein channels or carrier proteins to move molecules across the cell membrane (down the concentration gradient, passive). The image shows protein channels and carrier proteins. Osmosis is diffusion of water, active transport requires energy, simple diffusion does not use proteins. So the transport shown is facilitated diffusion (option d). The marked in the image is c (simple diffusion), which is incorrect. Simple diffusion does not use protein channels/carriers. Since the image has protein channels and carrier proteins, it's facilitated diffusion.

# Answer:
d. Facilitated diffusion

### Question 4
# Brief Explanations:
In diffusion, molecules move down the concentration gradient, i.e., from higher to lower concentration. "Down the gradient" means following the concentration gradient (higher to lower). "Against" or "up" is active transport, "without" is not accurate. So the correct option is a. The marked in the image is d, which is incorrect.

# Answer:
a. Down the gradient

### Question 5
# Brief Explanations:
Simple diffusion: molecules move directly through the phospholipid bilayer (no protein help), occurs for small, non - polar molecules (e.g., O₂, CO₂). Facilitated diffusion: molecules move through protein channels or carrier proteins (for polar, charged, or large molecules, e.g., glucose, ions). So the difference is that facilitated diffusion requires protein channels or carrier proteins to move molecules across the cell membrane, while simple diffusion does not; both are passive (move down concentration gradient, no energy).

# Answer:
Facilitated diffusion requires protein channels or carrier proteins to move molecules across the cell membrane, while simple diffusion does not (both are passive, moving down the concentration gradient without energy input).

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