B2.1 Flashcards
What is diffusion?
The net movement of particles from a region of high concentration to an region of low concentration
When the concentration gradient is 0, diffusion has___
When the concentration gradient is 0, diffusion has ended
Why is diffusion a passive process?
It is a passive process as it doesn’t use energy
What are the three factors that effect the rate of diffusion
Distance
Concentration Gradient
Surface Area
What is osmosis?
Th diffusion of water molecules across a selectively permeable membrane
Osmosis is from a ____ to a ____
Osmosis is from a high water potential to a low water potential
What is active transport?
The movement of molecules from a low concentration to a high concentration
What is required for active transport, and also comes from respiration?
ATP
What proteins are used in active transport?
Carrier Proteins
What is mitosis?
The process by which body cells divide
What are the four stages of mitosis?
Prophase
Metaphase
Anaphase
Telophase
What happens in the metaphase part of mitosis?
The chromosomes line up across the MIDDLE of the cell
What happens in the anaphase part of mitosis?
The chromosomes separate and move to opposite sides of the cell
What happens in the telophase part of mitosis?
Each end now has an identical set of chromosomes and become two daughter cells
What are differentiated cells?
Cells that are specialised to do their job
