Lipids Flashcards
which has more double bond oil or fat
oil
monounsaturated fatty acid
contain 1 C=C double bond
polyunsaturated fatty acid
contain multiple C=C double bonds
as double bonds increase what decreases
energy
melting point
where is the primary site of lipid digestion/absorption
small intestine
physical emulsification
mixing in stomach as food enters small intestine
chemical emulsification
bile mixed with digesta at duodenum
what is a micelle
fat droplet
where are fatty acids < 10 C absorbed to
directly to blood
where are fatty acids >12 C absorbed to
intracellular TAG formation
3 phases of fat absorption in SI
emulsification
enzymatic digestion
absorption
two types of emulsification
physical(stomach)
chemical(bile dependent)
what happens in absorption phase in SI
MAG and FFA diffuse from micelle into enterocyte
bile is absorbed in ileum
T/F microbes in the LI act on undigested lipids
TRUE
T/F TAG is easy for ruminants to digest
FALSE. usually fed less than 5%
glycolipid
-what is it found in
-where is sugar located
-what animals is it most common for
plants
contains sugar at sn1 position
primary lipid in grazing animals
Phospholipids
comes from microbial phospholipid
T/F phospholipids are the primary source of lipids digested in SI of ruminants
TRUE
purpose of B48
stabilize lipoprotein
confer specialty(nametag)
stimulate enzymatic functions
when does the lipoprotein become a chylomicron
when it travels to the Golgi apparatus and gains CHO
basic formula of a fatty acid
CH3-(CH2)n-COOH
what attachment is polar head group on
sn3
what attachment are unsaturated fatty acids on
sn2
what attachment are saturated fatty acids on
sn1
T/F lipids are digested by hydrolytic enzymes
TRUE
T/F lipids are important for synthesis of hormones
TRUE
what position do lingual lipase and gastric lipase attack
sn3
what position does pancreatic lipase attack
sn1and Sn3
mammalian enzymes involved in lipid digestion
Lingual Lipase
gastric lipase
phospholipase
pancreatic lipase
acyl CoA synthetase
Job of lingual and gastric lipase
TAG->DAG at sn3
important for babies to digest milk
T/F lingual and gastric lipase are found in large amounts in adults
FALSE
purpose of phospholipase
hydrolyze phospholipids in reticulorumen
purpose of pancreatic lipase
hydrolyze ester bonds at sn1 and sn2 position
purpose of colipase
creates bonding site for pancreatic lipase
purpose of acyl CoA synthetase
synthesize ester bonds
T/F acyl CoA synthetase can not bond to FFA < 11C
TRUE
purpose of lysolecithin
desorb SFA from feed particles
what products of lipid digestion can be fermented to make VFAs
glycerol
sugar
