Cell Biology Chapter 11

A FATTY FILM SO THIN AND TRANSPARENT THAT IT CANNOT BE SEEN DIRECTLY IN THE LIGHT MICROSCOPE

TWO PLY SHEET OF LIPID MOLECULES ABOUT 5NM OR 50 ATOMS THICK

THE MEMBRANE IS PENETRATED BY HIGHLY SELECTIVE CHANNELS AND PUMPS- PROTEIN MOLECULES THAT ALLOW SPECIFIC SUBSTANCES TO BE IMPORTED AND OTHERS TO BE EXPORTED. OTHER PROTEINS IN THE MEMBRANE ACT AS SENSORS THAT ENABLE THE CELL TO RECIEVE INFOMATION ABOUT CHANGES IN ITS ENVIRONMENT AND RESPOND

ENCLOSING AN INTRACELLULAR COMPARTMENT

CELL COMMUNICATION, IMPORT AND EXPORT OF MOLECULES, AND CELL GROWTH AND MOTILITY

ENABLE THE CELL TO RECEIVE SIGNALS FROM THE ENVIRONMENT

ENABLE THE CELLTO IMPORT AND EXPORT SMALL MOLECULES

ALLOW CELL GROWTH AND CELL MOVEMENT

2

ENCLOSE THE INTRACELLULAR COMPARTMENTS TO FORM VARIOUS ORGANELLES

ENDOPLASMIC RETICULUM, GOLGI APPARATUS AND THE MITOCONDRIA

BETWEEN SPACES CONTAINING DISTINCT COLLECTIONS OF MOLECULES

LIPIDS AND PROTEINS AND SHARE A COMMON GENERAL STRUCTURE

THE LIPIDS ARE ARRANGED IN TWO CLOSELY APPOSED SHEETS

ITS BASIC STRUCTURE AND SERVES AS A PERMEABILITY BARRIER TO MOST WATER-SOLUBLE MOLECULES.