3.2 The Plasma Membrane Flashcards
This image shows _____
plasma membrane
The _____ ______ is a flexible yet sturdy barrier that surrounds and contains the cytoplasm of the cell
plasma membrane
Two types of membrane proteins are
- integral proteins
- peripheral proteins
The different proteins help to determine the ____ of the the cell membrane.
a. porosity
b. functions
c. shape
d. placement
b. functions
Another term for integral protein
transmembrane
Membrane proteins can serve:
a) one function
b) a variety of functions
b) a variety of functions
A _____
transports a specific substance across membrane by undergoing a change in shape.
a) receptor
b) cell identity marker
c) linker (integral & peripheral)
d) carrier
d) carrier (integral)
Catalyzes reaction inside or outside cell (depending on which direction the active site faces).
a) receptor
b) cell identity marker
c) enzyme
d) carrier
c) enzyme (integral & peripheral)
Recognizes specific ligand and alters cells functions in some way.
a) receptor
b) cell identity marker
c) enzyme
d) carrier
a) receptor (integral)
Anchors filaments inside and outside the plasma membrane, providing structural stability and shape.
a) linker
b) carrier
c) ion channel (integral)
d) receptor
a) linker (integral & perripheral)
Distinguishes your cells from anyone elses (unless you are an identical twin).
a) receptor
b) enzyme
c) linker
d) cell identity marker
d) cell identity marker (glycoprotein)
A _____
forms a pore through which a specific ion can flow to get across membrane.
a) receptor
b) cell identity marker
c) ion channel (integral)
d) carrier
c) ion channel (integral)
Membranes are ___ structures because most of the membrane lipids and many of the membrane proteins move easily in the bilayer.
a) rigid
b) thin
c) fatty
d) fluid
d) fluid
Membrane lipids and proteins are mobile in their own half of the bilayer.
a) true
b) false
a) true
_____ serves to stabilize the membrane and reduce membrane fluidity.
cholesterol
Plasma membranes are selectively
a) permeable
b) non-permeable
a) permeable
_____ are only able to pass through the plasma membrane by vesicular transport.
a) macromolecules
b) lipid bilayers
c) transmembranes
a) macromolecules
_____ proteins that act as channels or transporters increase the permeability of the membrane.
a) transmembrane
b) lipid bilayer
c) macromolecule
a) transmembrane
The ______ is/are always permeable to small, non polar, uncharged molecules.
a) transmembrane
b) macromolecules
c) lipid bilayer
c) lipid bilayer
Together, a concentration and electrical gradient make up a/an ______ gradient
a) oppositional
b) protein
c) electrochemical
c) electrochemical
A/An _____ gradient is the difference in concentration of ions between one side of the plasma membrane and the other
a) electrical
b) electrochemical
c) concentration
a) electrical
A _______ gradient is the difference in the concentration of a chemical between one side of the plasma membrane and the other
a) electrical
b) concentration
c) electrochemical
Transport processes that move substances across the cell membrane are _____ processes & _____ processes.
- passive
- active
vesicular;
active or passive process?
active process
primary and secondary transport;
active or passive processes?
active processes
osmosis;
active or passive process?
passive process
facilitated diffusion;
active or passive process?
passive process
Simple diffusion
active or passive process?
passive process
Diffusion is influenced by which of the following (check all that apply)
- Steepness of the concentration gradient
- Temperature
- Mass of diffusion substance
- Surface area
- Diffusion distance
All of the above
Which type of transport does this image depict, active ort passive?
passive transport: simple diffusion
Transmembrane proteins help solutes that are too polar or too highly charged move through the lipid bilayer.
The processes involved are:
____ mediated facilitated diffusion
&
_____ mediated facilitated diffusion
channel
carrier
Transmembrane proteins help _____ that are too polar or too highly charged move through the lipid bilayer.
solutes
___________ proteins help solutes that are too polar or too highly charged move through the lipid bilayer.
lipid bilayer
Transmembrane proteins help solutes that are too polar or too highly charged move through the ____ ____.
lipid bilayer
