Bio 1201 exam 2 gregg QUESTIONS &
ANSWERS 100% CORRECT!!
transport proteins - ANSWERare responsible for controlling passage across the
membrane
fluid mosaic model - ANSWERThe membrane is a mosaic of protein molecules
bobbing in a fluid bilayer of phospholipids
fatty acid tails - ANSWERnonpolar, hydrophobic
fatty acid heads - ANSWERhydrophilic, polar
periphial proteins - ANSWERbound to the surface of the membrane
integral proteins - ANSWERpenetrate the hydrophobic core (ones that span the
membrane are transmembrane protiens
How do cells recognize each other? - ANSWERby binding to molecules, often
containing carbohydrates, on the extracellular surface of the plasma membrane
Glycolipids - ANSWERMembrane carbohydrates that are covalently bonded to lipids.
Hypdrophobic - ANSWERmolecules such as hydrocarbons that can dissolve in the
lipid bilayer and pass through the membrane rapidly
Hydrophilic - ANSWERmolecules that don't cross the membrane easily (ions and
polar molecules)
transport proteins - ANSWERallow passage of hydrophilic substances across the
membrane
carrier proteins - ANSWERbind to molecules and change shape to shuttle them
across the membrane
passive transport - ANSWERthe diffusion of a substance across a membrane with
no energy investment
Diffusuion - ANSWERSpreading 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 - ANSWERsubstances diffuse from high concentration----> low
concentration
Osmosis - ANSWERDiffusion of water through a selectively permeable membrane
, Isotonic - ANSWERwhen the concentration of two solutions is the same (no net
movement)
Hypertonic - ANSWERcell losses water and shrivils
hypertonic - ANSWERcell gains water and expands
In a plant cell water moves in and out affecting the size of what? - ANSWERcentral
vacuole
facilitated diffusion - ANSWERthe transport of substances through a cell membrane
along a concentration gradient with the aid of carrier proteins
ion channels - ANSWERchannel proteins that transport ions
gated channels - ANSWERopen or close in response to a stimulus
active transport - ANSWERrequires energy (ATP) to move substances against their
concentration gradient
ATP powers cellular work by - ANSWERcoupling exergonic reactions to endergonic
reactions
catalyst - ANSWERchemical agent that speeds up the rate of a chemical reaction
activation energy - ANSWERspeeds up reactions and weakens bonds so that they
are able to break and reform
cotransport - ANSWERcoupled transport by a membrane protein
transport proteins - ANSWERsmall molecules leave through the lipid bilayer
via___________?
Phagocytosis - ANSWERCell eating
Pinocytosis - ANSWERCell drinking
hydrophilic tails - ANSWERIf a plasma membrane were compared to a sandwich,
__________ would be considered the filling
Metabolism - ANSWERAll of the chemical reactions that occur within an organism
active transport - ANSWERcytoplasm of cell has a higher concentration of k+ ions.
How will K+ ions enter the cell?
metabolic pathway - ANSWERBegins with a specific molecule, which is then altered
in a series of defined steps, resulting in a certain product.
Energy - ANSWERthe capacity to cause change
ANSWERS 100% CORRECT!!
transport proteins - ANSWERare responsible for controlling passage across the
membrane
fluid mosaic model - ANSWERThe membrane is a mosaic of protein molecules
bobbing in a fluid bilayer of phospholipids
fatty acid tails - ANSWERnonpolar, hydrophobic
fatty acid heads - ANSWERhydrophilic, polar
periphial proteins - ANSWERbound to the surface of the membrane
integral proteins - ANSWERpenetrate the hydrophobic core (ones that span the
membrane are transmembrane protiens
How do cells recognize each other? - ANSWERby binding to molecules, often
containing carbohydrates, on the extracellular surface of the plasma membrane
Glycolipids - ANSWERMembrane carbohydrates that are covalently bonded to lipids.
Hypdrophobic - ANSWERmolecules such as hydrocarbons that can dissolve in the
lipid bilayer and pass through the membrane rapidly
Hydrophilic - ANSWERmolecules that don't cross the membrane easily (ions and
polar molecules)
transport proteins - ANSWERallow passage of hydrophilic substances across the
membrane
carrier proteins - ANSWERbind to molecules and change shape to shuttle them
across the membrane
passive transport - ANSWERthe diffusion of a substance across a membrane with
no energy investment
Diffusuion - ANSWERSpreading 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 - ANSWERsubstances diffuse from high concentration----> low
concentration
Osmosis - ANSWERDiffusion of water through a selectively permeable membrane
, Isotonic - ANSWERwhen the concentration of two solutions is the same (no net
movement)
Hypertonic - ANSWERcell losses water and shrivils
hypertonic - ANSWERcell gains water and expands
In a plant cell water moves in and out affecting the size of what? - ANSWERcentral
vacuole
facilitated diffusion - ANSWERthe transport of substances through a cell membrane
along a concentration gradient with the aid of carrier proteins
ion channels - ANSWERchannel proteins that transport ions
gated channels - ANSWERopen or close in response to a stimulus
active transport - ANSWERrequires energy (ATP) to move substances against their
concentration gradient
ATP powers cellular work by - ANSWERcoupling exergonic reactions to endergonic
reactions
catalyst - ANSWERchemical agent that speeds up the rate of a chemical reaction
activation energy - ANSWERspeeds up reactions and weakens bonds so that they
are able to break and reform
cotransport - ANSWERcoupled transport by a membrane protein
transport proteins - ANSWERsmall molecules leave through the lipid bilayer
via___________?
Phagocytosis - ANSWERCell eating
Pinocytosis - ANSWERCell drinking
hydrophilic tails - ANSWERIf a plasma membrane were compared to a sandwich,
__________ would be considered the filling
Metabolism - ANSWERAll of the chemical reactions that occur within an organism
active transport - ANSWERcytoplasm of cell has a higher concentration of k+ ions.
How will K+ ions enter the cell?
metabolic pathway - ANSWERBegins with a specific molecule, which is then altered
in a series of defined steps, resulting in a certain product.
Energy - ANSWERthe capacity to cause change
