assn q
fly fa tt y acid
Lipids (oleaginous) are chie
te rs , an d are th e ba si c bu ilding bl oc ks of
es
ica l m em br an es . An ot he r biological role
biol og
er gy st or ag e (e .g ., tri gl yc erides). M os t
is en
drophilic head
lipids consist of a polar or hy
lly gl yc er ol ) an d on e to th ree non po la r or
(typica
, and th er ef or e th ey
hydrophobic fa tty acid tails
co ns is t of
are amphiphilic. Fatty acids
at om s th at are
unbranched chains of carbon
alone (saturated
connected by single bonds
le and double bonds
fa tty acids) or by both sing
e chains are
(unsaturated fa tty acids) . Th
long, bu t it is
usually 14 -2 4 carbon groups
always an even number.
al membranes, th e
For lipids present in biologic
e of three classes:
hydrophilic head is fro m on
co nt ai n an
• Glycolipids, whose heads
ccharide
oligosaccharide w ith 1- 15 sa
residues.
s co nt ai n a
• Phospholipids, whose head
at is linked to th e
positively charged group th
ph os ph at e gr ou p.
tall by a negatively charged
ai n a planar st er oi d
• Sterols, whose heads co nt
l.
ring, fo r example, cholestero
fly fa tt y acid
Lipids (oleaginous) are chie
te rs , an d are th e ba si c bu ilding bl oc ks of
es
ica l m em br an es . An ot he r biological role
biol og
er gy st or ag e (e .g ., tri gl yc erides). M os t
is en
drophilic head
lipids consist of a polar or hy
lly gl yc er ol ) an d on e to th ree non po la r or
(typica
, and th er ef or e th ey
hydrophobic fa tty acid tails
co ns is t of
are amphiphilic. Fatty acids
at om s th at are
unbranched chains of carbon
alone (saturated
connected by single bonds
le and double bonds
fa tty acids) or by both sing
e chains are
(unsaturated fa tty acids) . Th
long, bu t it is
usually 14 -2 4 carbon groups
always an even number.
al membranes, th e
For lipids present in biologic
e of three classes:
hydrophilic head is fro m on
co nt ai n an
• Glycolipids, whose heads
ccharide
oligosaccharide w ith 1- 15 sa
residues.
s co nt ai n a
• Phospholipids, whose head
at is linked to th e
positively charged group th
ph os ph at e gr ou p.
tall by a negatively charged
ai n a planar st er oi d
• Sterols, whose heads co nt
l.
ring, fo r example, cholestero
