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