cell membrane Flashcards
what does the cell membrane do
The cell membrane provides protection for the cell from neighbouring cells and the external environment. The membrane provides support for the shape of the cell and controls what enters and exits it.
what does selectively permeable mean
only certain substances can pass through
what organisms have a cell wall
plant and fungi
where is the cell wall located
outside the cell membrane
what does the cell wall do
provides structure and support
is the cell wall permeable or selectively permeable
permeable
what is the cell membrane responsible for
- taking in nutrients for the cells
- excreting waste products
- ensuring toxic substances don’t enter the cell
describe the internal environment inside the cell
There is a multitude of different enzymes working in the cell to carry out our different cellular processes. Enzymes only work under specific conditions.
what is the fluid mosaic model?
the fluid mosaic model describes the membranes as lipid bilayers that can flow and change shape with proteins embedded in various patterns
what does the phospholipid bilayer consist of
Contains hydrophilic heads which means they love water, and two hydrophobic tails meaning they hate water.
where is cholesterol found
it is found dispersed throughout the cell
what does cholesterol do
It interacts and disrupts boundaries between the tails, allowing the membrane to maintain flexibility.
what are the different proteins found in the membrane
- adhesion proteins
- transport proteins
- receptor proteins
- glycoproteins (recognition proteins)
what are adhesion proteins
A membrane protein that helps link cells together to form tissues to allow communication
what are transport proteins
A protein that carries molecules across the membrane
