Cell Membrane Structure
The cell membrane is made of this many layers
2 (a bilayer)
The movement of water across a membrane
What is osmosis
Proteins can open up the cell membrane to allow larger molecules to enter the cell.
We made a hole in the bubble membrane with a string and passed a pencil through the hole.
These cells have a membrane
All cells!
What helps transport larger molecules across the cell membrane?
proteins
Membranes self-repair
When we poked our hand through the bubble, the bubble membrane was able to close the hole.
These structures attract water
Phosphate Heads
Membranes are fluid and flexible
When we made a bubble membrane, it moved and bent freely. It wasn't rigid.
The two main jobs of the cell membrane
Protect the cell and limit what goes in and out of the cell.
What structures repel water in the cell membrane?
Fatty Acid Tails
The solution is called this when there is the same concentration of solute on both sides of the membrane
What an isotonic solution
Bacteria cells can reproduce by binary fission.
When we "cut" the cell in half with the string, we created 2 bubbles.
Hypertonic solution
The solution has a higher concentration of solute outside the cell than inside. (or the outside of the cell has more particles than inside the cell)
The cell membrane is made of this. (scientific term)
Phospholipid bilayer
This happens to a cell that is placed in a saltwater solution.
water moves out of the cell and the cell shrinks.
Like the main cell membrane, organelles also have plasma membranes
We blew smaller bubbles inside the larger bubble.
What is another term for cell membrane?
Plasma membrane