Chapter 4 - 5 Honors Bio
Cell Theory
All cells are made up of cells and come from existing cells they are the structure and function of living things. SMALL!!
Transport Protein
Allows solute molecules to enter the cell
Surface area _____ keep up with the volume
Cannot
Stabilization of the phospholipids
Cholesterol helps to stabilize the structure of the plasma membrane.
The fluid mosaic model describes the plasma membrane as consisting of
Diverse proteins embedded in a phospholipid bilayer
When two aqueous solutions that differ in solute concentration are placed on either side of a semipermeable membrane and osmosis is allowed to take place, the water will
Exhibit a net movement to the side with lower free water concentration.
Cell Membrane
Fluid Mosaic Modle - Constant bending + Flowing - Imbedded with proteins - Phospholilod Bioayer - Regulates what comes in and out
Phospholipids ( Heads )
Hydrophilic ( Water Loving )
Phospholipids ( Tails )
Hydrophobic ( Water Fear )
Surface area allows the moment of stuff ______ or _____ of the cell.
In , Out
Glycoprotein
It is composed of both carbohydrate and a protein. They form hydrogen bonds with the water molecules surrounding the cell and thus help to stabilise membrane structure.
What is hydrophobic like in the interior of the plasma membrane
Lipid soluble molecule
Eukaryote Cell
More common, Most multicellular, Complex cells
When molecules move down their concentration gradient, they move from where they are __________ to where they are __________.
More concentrated , Less concentrated
Prokaryote Cell
No nucleus, few organelles, simple + primitive
Diffusion across a biological membrane is called _________.
Passive Transport
Oxygen crosses a plasma membrane by
Passive transport
What is true about passive transport?
Passive transport requires no expenditure of cellular energy
Phospholipid bilayer of membrane
Phospholipids can be recognized by the presence of a head and two tails.
Osmosis can be defined as
The diffusion of water
What controls the net direction of molecules, such as oxygen, involved, in passive transport?
The direction of the oxygen concentration gradient
Diffusion
There is a side with higher concentration of molecules on one side and side with lower concentration of molecules. With a plasma membrane in the middle. Diffusion causes a net movement of molecules down their concentration gradient.
The lipids in a cell membrane are arranged _____.
so that the nonpolar parts of two lipids point toward each other
Plasma membranes are selectively permeable. This means that
the plasma membrane allows some substances to enter or leave a cell more easily than others.
