Chapter 11 - Membrane Structure
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Which cells have internal membranes
Eukaryotic cells
Receptor proteins are where
Plasma membrane
Receptors proteins acts as what and what is the function
Sensors that enable the cell to receive information about changes in its environment and respond to them
If a cell is to survive and grow, _________ must pass inward cross the plasma membrane, _________ must pass out by highly selective channels and pump proteins.
Nutrients, waste products
Internal membranes functions
Surround organelles
Nucleus, mitochondria, and chloroplast are enclosed by
Two membranes; outer and inner
The cell membrane is made up of
Lipids and proteins
Lipid bilayer is made up of
Lipids are arranged into closely apposed sheets
Each membrane lipid is composed of what
Hydrophilic head and one or two hydrophobic tails
What is the most abundant lipids in cell membrane
Phospholipids
What is the most common phospholipid in cell membrane
Phosphatidycholine
What are hydrophobic tails made of
Fatty acids
Describe saturated fatty acids bonds
Has no double bonds between their carbon atoms
Describe Unsaturated fatty acids bond
Have 1 or more double bonds between their carbon atoms
Monounsaturated bonds fatty acids
Have 1 double bonds
Polyunsaturated fatty acids
Have 2 or more double bonds
What molecules dissolves in water
Hydrophilic molecules
Double bonds does what to the tails
Make it bend
Amphipathic
Because they have both hydrophilic and hydrophobic properties
OH is nonpolar or polar
Polar
Cholesterol lacks
Fatty acids
Molecules that are insoluble in water
Hydrophobic molecules
Hydrophobic exclusion
When hydrophobic molecules exclude themselves from water staying together
Triacylglcerols or triglycerides
Stores energy