2.5-membranes Flashcards
what is outside the cell membrane?
glycocalyx: formed from carb chains attached to either lipids or proteins in the membrane.
what is the myelin sheath made of?
flattened cells wrapped around neurones-several layers of cell membrane. high proportion of lipids compared to protein.
how are the plasma membranes of white blood cells specialised?
protein receptors
how are the plasma membranes of root hair cells specialised?
many carrier proteins to actively transport ions from soil to cells
how are the inner membranes of mitochondria specialised?
high proportion of protein compared to lipid-inner membranes contain protein electron carriers and H+ channels
whats an example of a place where exocytosis takes place?
synapses
HOW DO U MAKE AN EXPERIMENT MORE RELIABLE
REPEAT THE EXPERIMENT
CALCULATE A MEAN
IDENTIFY OUTLIERS
HOW DOES WATER GO THROUGH THE PLASMA MEMBRANE?
AQUAPORINS/PROTEIN PORES/CHANNEL PROTEINS
ALSO THEY FIT BETWEEN PHOSPHOLIPIDS
HOW DO VESICLES MOVE ABOUT IN A CELL?
ALONG MICROFILAMENTS/MICROTUBULES OF CYTOSKELETON
WHAT ARE THE TYPES OF PROTEINS IN A PLASMA MEMBRANE?
INTRINSIC-TRANSMEMBRANE
EXTRINSIC-ON THE SURFACE
HOW DOES TEMP AFFECT PLASMA MEMBRANE IN TERMS OF PHOSPHOLIPIDS?
the BILAYER becomes more fluid
can’t say the membrane becomes more fluid
have to say BILAYER
also can’t say they have more energy
have to say they have more KINETIC ENERGY.
what are the roles of membranes within cells?
forms, vesicles / (named) organelle(s) ;
separate (contents of) organelles from cytoplasm /
compartmentalisation ;
site of (named), processes / reactions ;
provides surface for attachment (of enzymes / ribosomes) ;
control what substances, enter / leave, organelles ;
creation of concentration gradients
WHAT BECOMES MORE FLUID AS TEMP INCREASES?
THE BILAYER!! CANT SAY PHOSPHOLIPID
