Transport of Water and Solutes in Plants Flashcards
The membrane that encloses and defines all cells as separate from their environment
plasma membrane
consists of a lipid bilayer that is semipermeable
cell membrane or plasma membrane
characterizes the plasma membrane consisting of a double
layer or bilayer, of lipid molecules,
cholesterol and proteins
fluid mosaic model
A number of proteins are
embedded in the lipid bilayer in a
way that resembles a
mosaic pattern
The membrane structure is ___ rather than motionless,
and the lipids move ___ within the membrane.
fluid ; laterally
The phosphate end of the phospholipid molecule is
polar
the fatty acid chains are
nonpolar
polar “head” is
hydrophilic
nonpolar “tail” is
hydrophobic
plasma membrane is choosy about what substances can pass through it, it’s said to be
selectively permeable or semipermeable
ease with which substances can pass through a border
permeability
most substances can easily pass through
permeable
substances can’t pass through
impermeable
pupose of membrane’s regulation of the passage of materials
maintain homeostasis
requires no energy on the part of the cell
passive transport
The molecules are moving from where they’re __ to where they’re
___.
more concentrated ; less concentrated
Movement of molecules from a region of higher concentration to a region of lower concentration
diffusion
it is the only means for gaseous movement within the plant’s body
diffusion
The molecules in a gas, a liquid or a solid are in constant motion due to
their
kinetic energy
random movement of molecules due to kinetic energy
Brownian motion
Unequal distribution of molecules
concentration gradient
Once the molecules become uniformly distributed, ___ ___ exists.
dynamic equilibrium