Cell Membranes

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

membrane functions

Back (Answer)

1) separate cells from the external medium to create an intracellular environment of unique and defined composition 2) allow selective transport of substrates in and out of the cell 3) provide a location for specialized pathways and processes 4) rapid changes in electric potential across the membrane of neurons as a basis of the nervous system 5) localization of rectors to facilitate response to physiological signals 6) mediate cell-cell recognition and interaction

Front (Question)

what is the basic structual element of a membrane

Back (Answer)

the lipid bilayer

Front (Question)

vesicles are made of

Back (Answer)

lipid bilayers

Front (Question)

exposure of hydrophobic tails is…

Back (Answer)

energetically unfavourable

Front (Question)

membranes are _____ to charged and polar molecules

Back (Answer)

impermeable

Front (Question)

True or false membranes are asymmertrical

Back (Answer)

true

Front (Question)

are membranes fluid

Back (Answer)

yes and dynamic

Front (Question)

what are membranes mostly made out of

Back (Answer)

lipids and proteins, active have a higher ratio of proteins

Front (Question)

plasma lipids are ______ distributed

Back (Answer)

asymmetrically

#10

Front (Question)

three classes of membrane proteins

Back (Answer)

1) peripheral 2) integral 3) lipid-anchored

#11

Front (Question)

peripheral membrane proteins associate with membrane though

Back (Answer)

charge-charge, h-bonding

#12

Front (Question)

change in pH or ionic strength often releases these proteins from the membranes

Back (Answer)

peripheral membrane proteins

#13

Front (Question)

what do peripheral membrane proteins do

Back (Answer)

regulators or tethers for interglacial membrane proteins

#14

Front (Question)

membrane proteins span___

Back (Answer)

the lipid bilayer

#15

Front (Question)

types of membrane proteins

Back (Answer)

alpha-helical bundles, and beta-barrels

#16

Front (Question)

carbonyl and amide groups of the proteins backbones inside the bilayer are

Back (Answer)

hydrogen bonded

#17

Front (Question)

stretches of 20 hydrophobic resides in a row are likely

Back (Answer)

membrane spanning

#18

Front (Question)

________ and ____ are often positioned at the interface between the polar face and the non-polar inter-membrane region

Back (Answer)

tyrosine, tryptophan

#19

Front (Question)

lipids which are covalently attached to the protein can serve as ___ to link the protein to the membrane

Back (Answer)

anchors

#20

Front (Question)

GPI anchored proteins ___________, fatty acyl or prenylated proteins always to inner face

Back (Answer)

always at outer face

#21

Front (Question)

Fluid Mosaic Model

Back (Answer)

membranes are dynamic due to the nature of the non-covalent interactions, lateral movement of proteins and lipids within the membrane is very rapid

#22

Front (Question)

below the phase transition temp the membrane is an

Back (Answer)

ordered paracrystalline gel state

#23

Front (Question)

well above the phase transisiton temp the membrane is in a

Back (Answer)

liquid disordered state

#24

Front (Question)

near the phase transition temp thte membrane is in a

Back (Answer)

liquid ordered state