Bio 1201 gregg Exam 2 (100% correct and graded
A+)
transport proteins - Answer-are responsible for controlling passage across the
membrane
/.fluid mosaic model - Answer-The membrane is a mosaic of protein molecules bobbing
in a fluid bilayer of phospholipids
/.fatty acid tails - Answer-nonpolar, hydrophobic
/.fatty acid heads - Answer-hydrophilic, polar
/.periphial proteins - Answer-bound to the surface of the membrane
/.integral proteins - Answer-penetrate the hydrophobic core (ones that span the
membrane are transmembrane protiens
/.How do cells recognize each other? - Answer-by binding to molecules, often
containing carbohydrates, on the extracellular surface of the plasma membrane
/.Glycolipids - Answer-Membrane carbohydrates that are covalently bonded to lipids.
/.Hypdrophobic - Answer-molecules such as hydrocarbons that can dissolve in the lipid
bilayer and pass through the membrane rapidly
/.Hydrophilic - Answer-molecules that don't cross the membrane easily (ions and polar
molecules)
/.transport proteins - Answer-allow passage of hydrophilic substances across the
membrane
/.carrier proteins - Answer-bind to molecules and change shape to shuttle them across
the membrane
/.passive transport - Answer-the diffusion of a substance across a membrane with no
energy investment
/.Diffusuion - Answer-Spreading out of particles away from each other, from an area of
high concentration to an area of low concentration. (move to where space is available)
/.concentation gradient - Answer-substances diffuse from high concentration----> low
concentration
, /.Osmosis - Answer-Diffusion of water through a selectively permeable membrane
/.Isotonic - Answer-when the concentration of two solutions is the same (no net
movement)
/.Hypertonic - Answer-cell losses water and shrivils
/.hypertonic - Answer-cell gains water and expands
/.In a plant cell water moves in and out affecting the size of what? - Answer-central
vacuole
/.facilitated diffusion - Answer-the transport of substances through a cell membrane
along a concentration gradient with the aid of carrier proteins
/.ion channels - Answer-channel proteins that transport ions
/.gated channels - Answer-open or close in response to a stimulus
/.active transport - Answer-requires energy (ATP) to move substances against their
concentration gradient
/.cotransport - Answer-coupled transport by a membrane protein
/.transport proteins - Answer-small molecules leave through the lipid bilayer
via___________?
/.Phagocytosis - Answer-Cell eating
/.Pinocytosis - Answer-Cell drinking
/.hydrophilic tails - Answer-If a plasma membrane were compared to a sandwich,
__________ would be considered the filling
/.Metabolism - Answer-All of the chemical reactions that occur within an organism
/.active transport - Answer-cytoplasm of cell has a higher concentration of k+ ions. How
will K+ ions enter the cell?
/.metabolic pathway - Answer-Begins with a specific molecule, which is then altered in a
series of defined steps, resulting in a certain product.
/.Energy - Answer-the capacity to cause change
A+)
transport proteins - Answer-are responsible for controlling passage across the
membrane
/.fluid mosaic model - Answer-The membrane is a mosaic of protein molecules bobbing
in a fluid bilayer of phospholipids
/.fatty acid tails - Answer-nonpolar, hydrophobic
/.fatty acid heads - Answer-hydrophilic, polar
/.periphial proteins - Answer-bound to the surface of the membrane
/.integral proteins - Answer-penetrate the hydrophobic core (ones that span the
membrane are transmembrane protiens
/.How do cells recognize each other? - Answer-by binding to molecules, often
containing carbohydrates, on the extracellular surface of the plasma membrane
/.Glycolipids - Answer-Membrane carbohydrates that are covalently bonded to lipids.
/.Hypdrophobic - Answer-molecules such as hydrocarbons that can dissolve in the lipid
bilayer and pass through the membrane rapidly
/.Hydrophilic - Answer-molecules that don't cross the membrane easily (ions and polar
molecules)
/.transport proteins - Answer-allow passage of hydrophilic substances across the
membrane
/.carrier proteins - Answer-bind to molecules and change shape to shuttle them across
the membrane
/.passive transport - Answer-the diffusion of a substance across a membrane with no
energy investment
/.Diffusuion - Answer-Spreading out of particles away from each other, from an area of
high concentration to an area of low concentration. (move to where space is available)
/.concentation gradient - Answer-substances diffuse from high concentration----> low
concentration
, /.Osmosis - Answer-Diffusion of water through a selectively permeable membrane
/.Isotonic - Answer-when the concentration of two solutions is the same (no net
movement)
/.Hypertonic - Answer-cell losses water and shrivils
/.hypertonic - Answer-cell gains water and expands
/.In a plant cell water moves in and out affecting the size of what? - Answer-central
vacuole
/.facilitated diffusion - Answer-the transport of substances through a cell membrane
along a concentration gradient with the aid of carrier proteins
/.ion channels - Answer-channel proteins that transport ions
/.gated channels - Answer-open or close in response to a stimulus
/.active transport - Answer-requires energy (ATP) to move substances against their
concentration gradient
/.cotransport - Answer-coupled transport by a membrane protein
/.transport proteins - Answer-small molecules leave through the lipid bilayer
via___________?
/.Phagocytosis - Answer-Cell eating
/.Pinocytosis - Answer-Cell drinking
/.hydrophilic tails - Answer-If a plasma membrane were compared to a sandwich,
__________ would be considered the filling
/.Metabolism - Answer-All of the chemical reactions that occur within an organism
/.active transport - Answer-cytoplasm of cell has a higher concentration of k+ ions. How
will K+ ions enter the cell?
/.metabolic pathway - Answer-Begins with a specific molecule, which is then altered in a
series of defined steps, resulting in a certain product.
/.Energy - Answer-the capacity to cause change
