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NUTR 425 Ex 3 Random

Questions from throughout the NUTR 425 exam study guide.

QuestionAnswer
What is the simplest class of lipids? Fatty Acids
At which end of the fatty acid chain does delta numbering start? The carboxylic acid end
Name 18:3n3 alpha linolenic acid
List the two essential fatty acids and explain why they are essential. linoleic and alpha linolenic; These are essential because human lack Δ12 and Δ15 desaturases that are necessary to add double bonds to 18 carbon fatty acid chains
This form of fat comprises 95% of dietary fat. Triglycerides
Name a triglyceride with palmitic acid, oleic acid, and stearic acid in the 1, 2, and 3 positions, respectively 1-palmitoyl-2-oleoyl-3-stearoyl glycerol
The most common sterol Cholesterol
This enzyme is secreted by serous glands under the tongue and works on FA with 12C or less lingual lipase
What is signaled by the release of CCK? What causes the release of CCK? gallbladder releases stored bile; fat in the small intestine
What enzyme hydrolyzes cholesterol? cholesterol ester hydrolase
Bile salts do not cross into the enterocyte and are returned to the liver by what route? the portal vein (lymphatic)
Which lipoprotein contains the least protein? The most? chylomicron; HDL
These confer specificity to lipoproteins. apoproteins
What is the primary function of LDL? of HDL? transport of cholesterol to the tissues; removal of cholesterol from cells where it has accumulated and return it to the liver for excretion in bile
How many ATP are consumed in the activation of a fatty acid by coenzyme A? 2 (ATP --> AMP + PPi)
What molecule is used to transfer long chain fatty acids into the mitochondria? carnitine
Calculate the ATP yield of stearate. 8 C-C cleavages, 9 Acetyl CoAs oxidized, -2 ATPs for activation = 146 ATP from stearate
Name the starting molecule in cholesterol synthesis Acetyl CoA
List the two key components of the fatt acid synthase system Acyl carrier protein (ACP) and Condensing Enzyme (CE)
Name the 3 categories of eicoanoids Prostaglandins, thromboxanes, and leukotrienes
What does PDGF do? Attracts monocytes to damaged areas in arteries.
Created by: nm1213
 

 



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