Lesson 3: Cell Membrane Flashcards
All membranes have the same basic functions:
to provide shape and structure, and control what enters and exits the cell
The cell membrane is…
selectively permeable (controlling which molecules cross)
The plasma membrane is the…
outer-most membrane of a cell.
In plants, the cell wall is…
on the outside of the membrane.
Membranes are made up of…
proteins and lipids.
The basic structure is known as a…
phospholipid bilayer, consisting of 2 thin sheets of polar phospholipids.
A phospholipid is a…
molecule that has a phosphate ‘head’ and two fatty acid ‘tails’.
The phosphate end mixes well with ________, with the tails do not mix well with it.
water
Protein channels can be…
structural or used to transport substances across the cell membrane.
Channel proteins are…
hydrophilic which allow large or water-soluble molecules to pass through the membrane.
Phospholipids make up the…
outer layer of the cell membrane; they have a hydrophilic head (phosphate) and a hydrophobic tail (fatty acid).
Cholestrol is a…
steroid found within the phospholipid bilater and regulates fluidity of the membrane.
Glycoproteins are proteins which possess a…
branching carbohydrate on their free surface - they stick out like antennae and act as a recognition system for the immune response.
The fluid mosiac of the cell membrane is how scientists describe what the cell membrane…
looks and functions like.
Membranes are not…
static, they are described as fluid.
