The Question is from neet-botany plant-physiology faciliated-diffusion, and it was created by the author D VINOD

Question

Which of the following is NOT a characteristic of facilitated diffusion?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Facilitated Diffusion
 **Related Topics**: Membrane transport, passive transport, active transport
 **Prerequisites**: Understanding of concentration gradients, membrane permeability, and energy requirements in cellular processes.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify a characteristic that is NOT associated with facilitated diffusion.
  Options describe various aspects of membrane transport.
**Method & Steps**:
 1. Analyze each option to determine if it accurately describes facilitated diffusion.
  Reasoning: Facilitated diffusion is a type of passive transport that utilizes membrane proteins to move substances across the cell membrane.  It does not require energy (ATP) because it moves substances *down* their concentration gradient (from high to low concentration).
 2. Identify the option that contradicts the definition of facilitated diffusion.
  Working: Option A is correct; facilitated diffusion requires specific membrane proteins (channels or carriers). Option B is correct; it's passive and doesn't need ATP. Option C is correct; it's a passive process. Option D is incorrect; facilitated diffusion moves substances *with* their concentration gradient, not against it.
 3. Select the option that is not a characteristic of facilitated diffusion.
  Result: Option D is the correct answer.
  Verification:  The definition of facilitated diffusion aligns with options A, B, and C, but contradicts option D.
 ## OPTION ANALYSIS
A ✓: It requires specific membrane proteins. This is true. Facilitated diffusion relies on membrane proteins (channels or carriers) to facilitate the transport of molecules across the membrane.
B :x: It does not require ATP. This is true. Facilitated diffusion is a passive process and does not require energy input.
C :x: It is a passive process. This is true. Facilitated diffusion is a passive transport mechanism, meaning it doesn't require energy.
D :x: It moves substances against their concentration gradient. This is false. Facilitated diffusion moves substances *down* their concentration gradient, from an area of high concentration to an area of low concentration.  Moving substances against their concentration gradient requires active transport and ATP.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing facilitated diffusion with active transport:  Active transport moves substances *against* their concentration gradient and requires ATP, unlike facilitated diffusion.
  2.Thinking all membrane transport requires proteins: Simple diffusion does not require membrane proteins.
 **Quick Tips**:
  1.Remember the key difference between passive and active transport: Passive transport (including facilitated diffusion) doesn't require ATP, while active transport does.
  2.Visualize the movement of molecules: In facilitated diffusion, molecules move down their concentration gradient, like a ball rolling downhill.

D VINOD · Answer

It requires specific membrane proteins.

D VINOD · Answer

It does not require ATP.

D VINOD · Answer

It is a passive process.

D VINOD · Answer

The correct Option is "It moves substances against their concentration gradient."

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