ESSENTIAL CELL BIOLOGY 4TH EDITION BY
ALBERTS 2026 EXAM REVIEW STUDY GUIDE
BUNDLED QUESTIONS AND ANSWERS
PREMIUM
◉ Lipid Bilayer. Answer: double-layered sheet that forms the core of
nearly all cell membranes
◉ Phosphatidylcholine. Answer: Common phospholipid present in
abundance in most cell membranes; uses choline attached to a
phosphate as its head group.
◉ Phospholipids. Answer: the most abundant lipid in the plasma
membrane; have a phosphate-containing hydrophilic head linked to
two hydrophobic tails
◉ amphipathic. Answer: having both a hydrophilic region and a
hydrophobic region
◉ unsaturated hydrocarbon tails. Answer: contains a double bond
that makes a "kink" in the hydrocarbon tail; prevent packing,
enhancing membrane fluidity;
,◉ saturated hydrocarbon tails. Answer: pack together, increasing
membrane viscosity
◉ Endoplasmic Reticulum. Answer:
◉ scramblase. Answer: enzymes that remove randomly selected
phospholipids from one of half of the bilayer and deposit them in the
other. Found in ER
◉ flippase. Answer: remove specific phospholipids from facing the
exterior space and flip them into the later facing the cytosol found in
Golgi
◉ membrane proteins. Answer: Embedded proteins that perform
specific functions for the cell membrane.; peripheral and integral
◉ transporters. Answer: mechanisms in the membrane of a cell that
actively transport ions or molecules across the membrane
◉ ion channels. Answer: A transmembrane protein channel that
allows a specific ion to diffuse across the membrane down its
concentration or electrochemical gradient.
,◉ anchors. Answer: attach to other proteins to help maintain cell
structure and shape; link Intracellular actin filaments to
extracellular matrix proteins
◉ receptors. Answer: Special structures that allow living organisms
to sense the conditions of their internal or external environment.
◉ enzymes. Answer: Proteins that speed up chemical reactions
◉ transmembrane proteins. Answer: Extend through the bilayer
with part of their mass on either side - (single alpha helix; 1), (beta
barrel; 3), (multiple alpha helices; 2)
◉ monolayer associated proteins. Answer: (4) directly attached only
to the cytosolic layer by an amphipathic alpha helix
◉ Lipid-linked proteins. Answer: (5,6) covalently bonded to a lipid
group inserted into the bilayer.
◉ protein-attached proteins. Answer: (7,8) attached to the
membrane by weak, non-covalent interactions with other membrane
proteins
, ◉ integral membrane proteins. Answer: (1,2,3,4,5,6)proteins that
are directly attached to the lipid bilayer
◉ periphereal membrane protiens. Answer: (7,8) proteins not
directly attached to the lipid bilayer
◉ single-pass transmembrane protein. Answer:
◉ multipass transmembrane proteins. Answer:
◉ detergents. Answer: -organic molecules with hydrophilic and
hydrophobic ends
- act as wetting agents and emulsifiers
◉ Hydrophilic part of detergents purpose. Answer: Brings
membrane protein into solution
◉ Hydrophobic part of detergents. Answer: interacts with
membrane spanning hydrophobic regions of transmembrane
proteins and hydrophobic tails of lipids.
◉ Bacteriorhodopsin. Answer: Pigmented protein found in
abundance in the plasma membrane of the salt-loving archaeon
ALBERTS 2026 EXAM REVIEW STUDY GUIDE
BUNDLED QUESTIONS AND ANSWERS
PREMIUM
◉ Lipid Bilayer. Answer: double-layered sheet that forms the core of
nearly all cell membranes
◉ Phosphatidylcholine. Answer: Common phospholipid present in
abundance in most cell membranes; uses choline attached to a
phosphate as its head group.
◉ Phospholipids. Answer: the most abundant lipid in the plasma
membrane; have a phosphate-containing hydrophilic head linked to
two hydrophobic tails
◉ amphipathic. Answer: having both a hydrophilic region and a
hydrophobic region
◉ unsaturated hydrocarbon tails. Answer: contains a double bond
that makes a "kink" in the hydrocarbon tail; prevent packing,
enhancing membrane fluidity;
,◉ saturated hydrocarbon tails. Answer: pack together, increasing
membrane viscosity
◉ Endoplasmic Reticulum. Answer:
◉ scramblase. Answer: enzymes that remove randomly selected
phospholipids from one of half of the bilayer and deposit them in the
other. Found in ER
◉ flippase. Answer: remove specific phospholipids from facing the
exterior space and flip them into the later facing the cytosol found in
Golgi
◉ membrane proteins. Answer: Embedded proteins that perform
specific functions for the cell membrane.; peripheral and integral
◉ transporters. Answer: mechanisms in the membrane of a cell that
actively transport ions or molecules across the membrane
◉ ion channels. Answer: A transmembrane protein channel that
allows a specific ion to diffuse across the membrane down its
concentration or electrochemical gradient.
,◉ anchors. Answer: attach to other proteins to help maintain cell
structure and shape; link Intracellular actin filaments to
extracellular matrix proteins
◉ receptors. Answer: Special structures that allow living organisms
to sense the conditions of their internal or external environment.
◉ enzymes. Answer: Proteins that speed up chemical reactions
◉ transmembrane proteins. Answer: Extend through the bilayer
with part of their mass on either side - (single alpha helix; 1), (beta
barrel; 3), (multiple alpha helices; 2)
◉ monolayer associated proteins. Answer: (4) directly attached only
to the cytosolic layer by an amphipathic alpha helix
◉ Lipid-linked proteins. Answer: (5,6) covalently bonded to a lipid
group inserted into the bilayer.
◉ protein-attached proteins. Answer: (7,8) attached to the
membrane by weak, non-covalent interactions with other membrane
proteins
, ◉ integral membrane proteins. Answer: (1,2,3,4,5,6)proteins that
are directly attached to the lipid bilayer
◉ periphereal membrane protiens. Answer: (7,8) proteins not
directly attached to the lipid bilayer
◉ single-pass transmembrane protein. Answer:
◉ multipass transmembrane proteins. Answer:
◉ detergents. Answer: -organic molecules with hydrophilic and
hydrophobic ends
- act as wetting agents and emulsifiers
◉ Hydrophilic part of detergents purpose. Answer: Brings
membrane protein into solution
◉ Hydrophobic part of detergents. Answer: interacts with
membrane spanning hydrophobic regions of transmembrane
proteins and hydrophobic tails of lipids.
◉ Bacteriorhodopsin. Answer: Pigmented protein found in
abundance in the plasma membrane of the salt-loving archaeon
