chap 5 Flashcards
The fluid mosaic model describes membrane as
made of proteins and lipids that can move freely
protein floats on lipid bilayer like boat on pond
what chemical property characterizes interior of lipid bilayer:?
- hydrophobic
- hydrophillic
- polar
- saturated
Hydrophobic
transmembrane domain of an integral protein \_\_\_\_\_: -is composed of amino acids - often alpha helical structure -cross membrane multiple times all
all
specific function of membrane within a cell is determined by the__________
type and number of membrane proteins
movement of water across membrane is dependant on __________
solute concentration
cells immersed in a sugar and salt solution shrink, this suggests that the solution is _____tonic
Hypertonic
what happens to animal and plant cells immersed in a hypotonic solution
water crosses into cell where solute concentration is higher- cells will swell, animal cells will rupture, plant cells will be protected by cell wall
what is NOT a mechanism for bringing matter into the cell:
- endocytosis
- phagocytosis
- pinocytosis
- exocytosis
exocytosis
bacterial cell can alter comp of sat and unsat fatty acids- it is adapted to cold. what will happen in warm env
increase in degree of saturated fatty acids
what variable influences whether a nonpolar molecule can pass a membrane via PASSIVE diffusion
the difference in concentration of the molecule across the membrane
which of the following does not contribute to selective permeability of the membrane:
protein specificity
channel protein selectivity
hydrophobic barrier of PL bilayer
hydrogen bond between water and phosphate group
H bond between water and phosphate
how are active and coupled transport related
coupled transport uses gradient established by active
cell can use facilitated diffusion to :
move ions or large polar molecules from high -low concentration
