Concenttation Gradient Flashcards
(15 cards)
What is a concentration gradient?
A concentration gradient is the difference in the concentration of a substance across a space.
True or False: A concentration gradient can exist for any type of molecule.
True
Fill in the blank: Molecules move from areas of _____ concentration to areas of _____ concentration.
high, low
What is the primary driving force behind diffusion?
The concentration gradient.
Multiple choice: What happens to molecules in a concentration gradient at equilibrium?
They move equally in all directions.
What role does the concentration gradient play in osmosis?
It determines the direction of water movement across a semipermeable membrane.
True or False: A steeper concentration gradient results in faster diffusion rates.
True
What is meant by ‘passive transport’ in relation to concentration gradients?
Passive transport is the movement of substances across a membrane without the need for energy, driven by concentration gradients.
Short answer: How does active transport differ from passive transport?
Active transport requires energy to move substances against their concentration gradient.
Fill in the blank: The process of molecules moving down their concentration gradient is known as _____.
diffusion
Multiple choice: Which of the following processes does NOT require a concentration gradient?
Active transport
What is a ‘chemical gradient’?
A chemical gradient is a type of concentration gradient specifically referring to the concentration of chemicals.
True or False: Concentration gradients can influence cellular processes.
True
Short answer: What is the effect of temperature on concentration gradients?
Higher temperatures increase molecular movement, potentially steepening the concentration gradient.
Fill in the blank: In a concentration gradient, the substance moves from an area of _____ to an area of _____ until equilibrium is reached.
higher concentration, lower concentration
