Diffusion (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
Why does diffusion not require ATP?
Why does diffusion not require ATP?
Energy from particle kinetic motion
How do particles move during diffusion?
How do particles move during diffusion?
Random patterns with no set direction
What is simple diffusion?
What is simple diffusion?
Net movement from high to low concentration
How does concentration gradient steepness affect diffusion?
How does concentration gradient steepness affect diffusion?
Steeper gradient = faster diffusion
Which molecules readily cross membranes by simple diffusion?
Which molecules readily cross membranes by simple diffusion?
Small, non-polar molecules
What does facilitated diffusion transport?
What does facilitated diffusion transport?
Charged ions and polar molecules
What feature do protein channels exhibit?
What feature do protein channels exhibit?
Selectivity for specific ions
How do carrier proteins transport molecules?
How do carrier proteins transport molecules?
Bind molecule, change shape, release
How does temperature affect diffusion rate?
How does temperature affect diffusion rate?
Higher temperature increases kinetic energy
What distinguishes simple from facilitated diffusion?
What distinguishes simple from facilitated diffusion?
Facilitated requires membrane proteins