Transport Across Cell Membranes Flashcards
Why is the cell membrane structure described as being a fluid mosaic?
The lipids and proteins are randomly arranged
What is the cell membrane made up of?
Protein and lipid molecules
What molecule can form a pore?
A protein molcule
Are cell membranes fully or selectively permeable?
They are selectively permeable
What does selectively permeable mean?
Large insoluble molecules can’t pass through however small soluble ones can
Name the 3 different types of transport across the cell membrane
Diffusion
Osmosis
Active transport
What is diffusion?
The movement of molecules of a substance from an area of high concentration to an area of low concentration
What is osmosis?
The movement of water molecules from an area of high water concentration to an area of low water concentration
What is active transport?
The movement of molecules from a region of low concentration to a region of high concentration against the concentration gradient.
What processes are passive ones?
Diffusion and osmosis
What processes are active processes?
Active transport
What is cell culture?
Using the process of mitosis to grow cells in an artificial environment
Name 4 things cell culture requires
A growing medium
Available oxygen
Suitable temperature
Suitable pH level
Name 2 growing mediums
Nutrient broth
Agar jelly
What do aseptic techniques allow you to do?
To help maintain a sterile environment and prevent contamination
