Bio 1201 exam 2 gregg Questions With 100% Correct Answers
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Course
Biol 1201
Institution
Biol 1201
Bio 1201 exam 2 gregg Questions With 100% Correct Answers
transport proteins
are responsible for controlling passage across the membrane
fluid mosaic model
The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids
fatty acid tails
nonpolar, hydrophobic
...
Bio 1201 exam 2 gregg Questions With 100%
Correct Answers
transport proteins
are responsible for controlling passage across the membrane
fluid mosaic model
The membrane is a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids
fatty acid tails
nonpolar, hydrophobic
fatty acid heads
hydrophilic, polar
periphial proteins
bound to the surface of the membrane
integral proteins
penetrate the hydrophobic core (ones that span the membrane are transmembrane protiens
How do cells recognize each other?
by binding to molecules, often containing carbohydrates, on the extracellular surface of the plasma
membrane
Glycolipids
Membrane carbohydrates that are covalently bonded to lipids.
Hypdrophobic
molecules such as hydrocarbons that can dissolve in the lipid bilayer and pass through the membrane
rapidly
Hydrophilic
molecules that don't cross the membrane easily (ions and polar molecules)
transport proteins
allow passage of hydrophilic substances across the membrane
carrier proteins
bind to molecules and change shape to shuttle them across the membrane
passive transport
the diffusion of a substance across a membrane with no energy investment
, Diffusuion
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
substances diffuse from high concentration----> low concentration
Osmosis
Diffusion of water through a selectively permeable membrane
Isotonic
when the concentration of two solutions is the same (no net movement)
Hypertonic
cell losses water and shrivils
hypertonic
cell gains water and expands
In a plant cell water moves in and out affecting the size of what?
central vacuole
facilitated diffusion
the transport of substances through a cell membrane along a concentration gradient with the aid of
carrier proteins
ion channels
channel proteins that transport ions
gated channels
open or close in response to a stimulus
active transport
requires energy (ATP) to move substances against their concentration gradient
cotransport
coupled transport by a membrane protein
transport proteins
small molecules leave through the lipid bilayer via___________?
Phagocytosis
Cell eating
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