Cell Transport Review 2 Name: 6.0 Biology Date: Period: The fluid mosaic model describes the plasma membrane as consisting of a phospholipid bilayer with embedded carbohydrates two layers of phospholipids with proteins sandwiched between them a protein bilayer with embedded phospholipids carbohydrates, proteins, and phospholipids that can drift in the membrane a phospholipid bilayer embedded with proteins attached to carbohydrates that can among the lipids. “float” Membrane phospholipids have hydrophobic heads that face the center of the membrane and are shielded from water. often have in their tails caused by the presence of a double bond between carbons. “kinks” form a strong barrier between the cell and its surroundings. form impermeable layers for cells. Most of the functions of a cell membrane are performed by Glycolipids Cholesterol Proteins Nucleotides Phospholipids Oxygen crosses a plasma membrane by Osmosis Pinocytosis Phagocytosis Passive transport Active transport Plasma membranes are selectively permeable. This means that Anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy The plasma membrane allows some substances to enter of leave a cell more easily than others Glucose cannot enter the cell Cholesterol cannot enter the cell Plasma membranes must be very thick Small, nonpolar, hydrophobic molecules such as fatty acids Easily pass through a membrane’s lipid bilayer Very slowly diffuse through a membrane’s lipid bilayer Require transport proteins to pass through a membrane’s lipid bilayer Are actively transported across cell membranes Usually enter the cell via endocytosis Facilitated diffusion across a biological membrane requires _______ and moves a substance _______ its concentration gradient. Energy/transport proteins…….down Energy/transport proteins…..against Energy down….. down Transport proteins…..against Transport proteins….. down
Cell Transport Review 2 Name: 6.0 Biology Date: Period: The fluid mosaic model describes the plasma membrane as consisting of a phospholipid bilayer with embedded carbohydrates two layers of phospholipids with proteins sandwiched between them a protein bilayer with embedded phospholipids carbohydrates, proteins, and phospholipids that can drift in the membrane a phospholipid bilayer embedded with proteins attached to carbohydrates that can “float” among the lipids. Membrane phospholipids have hydrophobic heads that face the center of the membrane and are shielded from water. often have “kinks” in their tails caused by the presence of a double bond between carbons. form a strong barrier between the cell and its surroundings. form impermeable layers for cells. Most of the functions of a cell membrane are performed by Glycolipids Proteins Phospholipids Cholesterol Nucleotides Oxygen crosses a plasma membrane by Osmosis Phagocytosis Active transport Pinocytosis Passive transport Plasma membranes are selectively permeable. This means that Anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy The plasma membrane allows some substances to enter of leave a cell more easily than others Glucose cannot enter the cell Cholesterol cannot enter the cell Plasma membranes must be very thick Small, nonpolar, hydrophobic molecules such as fatty acids Easily pass through a membrane’s lipid bilayer Very slowly diffuse through a membrane’s lipid bilayer Require transport proteins to pass through a membrane’s lipid bilayer Are actively transported across cell membranes Usually enter the cell via endocytosis Facilitated diffusion across a biological membrane requires _______ and moves a substance _______ its concentration gradient. Energy/transport proteins…….down Energy down….. down Transport proteins….. down Energy/transport proteins…..against Transport proteins…..against
Cell%20Transport%20Review%202.docx