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Cell Biology: Transport Mechanisms

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Questions and Answers

What is a characteristic of carrier proteins involved in facilitated diffusion?

They move substances down their concentration gradients (correct)

They require energy input to function

They are only involved in active transport

They move substances against their concentration gradients

What is the direction of substance movement facilitated by carrier proteins?

Up their concentration gradients

Against their concentration gradients

Randomly in all directions

Down their concentration gradients (correct)

What is the energy requirement for facilitated diffusion?

It only requires energy at night

It does not require any energy input (correct)

It requires a lot of energy

It requires a little energy

What type of transport is facilitated diffusion an example of?

Passive transport Signup and view all the answers

What is responsible for facilitating diffusion in cells?

Carrier proteins Signup and view all the answers

What happens to the concentration gradient during facilitated diffusion?

It decreases Signup and view all the answers

What is the role of carrier proteins in facilitated diffusion?

To move substances down their concentration gradients Signup and view all the answers

What type of transport is facilitated diffusion?

Passive transport Signup and view all the answers

What drives the movement of substances in facilitated diffusion?

Concentration gradient Signup and view all the answers

What is the result of facilitated diffusion on the concentration gradient?

It decreases the concentration gradient Signup and view all the answers

What is a characteristic of facilitated diffusion that distinguishes it from active transport?

It does not require energy input Signup and view all the answers