Chap 10 Quiz

Question 1

The two locations of triacylglycerol digestion

Answer 1

Mouth and Stomach

Question 2

The lipase for mouth and stomach

Answer 2

Mouth - lingual lipase

Stomach - gastric lipase

Question 3

Both lipases for triacylglycerol digestion are active at

Answer 3

low pH

Question 4

Triacylglycerol Digestion does not require

Answer 4

other proteins cofactors for max. activity

Question 5

Synthesis of Triacylglycerols occurs predominantly in

Answer 5

enterocytes

Question 6

Lipoproteins defined

Answer 6

Spherical micelles of phospholipids and apolipoproteins surrounding a neutral lipid core

Question 7

Examples of Lipoproteins

Answer 7

HDL
IDL
LDL
VLDL

Question 8

Structure of a Lipoprotein

Answer 8

Triglyceride and cholesteryl ester core

Phospholipid and cholesterol coat

Question 9

Three mechanisms in which lipids enter the cell

Answer 9

Diffusion

Transport

Receptor-mediated endocytosis

Question 10

Receptor-mediated endocytosis defined

Answer 10

Process in which the cell internalizes particles and uses the cholesterol contents of low-density lipoproteins

Question 11

What binds to the receptor in receptor-mediated endocytosis

Answer 11

Ligand (clathrin)

Question 12

Triacylglycerol Synthesis occurs where

Answer 12

liver and adipose tissue

Question 13

Triacylglycerol Synthesis in the liver

Answer 13

de novo synthesis from actyl-CoA

Question 14

Triacylglycerol Synthesis in adipose tissue

Answer 14

Re-esterifies free fatty acids (storage)

Question 15

Enzymes for triacylglycerol synthesis are found in

Answer 15

the endoplasmic reticulum

Question 16

In digestion lipids are emulsified by

Answer 16

bile salts into smaller droplets

Question 17

Pancreatic lipase hydrolyzes

Answer 17

ester bonds in triacylglycerols releasing fatty acids

Question 18

Triacylglycerols are packaged into what form to travel the blood stream

Answer 18

chylomicrons

Question 19

Lipoprotein are complex particles composed of

Answer 19

Lipids (cholesterol/triglycerides) & Proteins

Question 20

Chylomicrons are the

Answer 20

largest and least dense lipoproteins and are primarily transporting dietary triglycerides from intestine to tissue

Question 21

HDL are synthesized in the ____ and involved in _____

Answer 21

liver; reverse cholesterol transport for excretion

Question 22

Diffusion is a _____ process for lipoproteins

Answer 22

passive; moves from areas of high concen. to lower

Question 23

Transport involves specific

Answer 23

carrier proteins embedded in cell membranes

Question 24

Receptor-Mediated Endocytosis specific process involving

Answer 24

the binding of extracellular ligands

Question 25

Reverse Cholesterol transport defined

Answer 25

Removal of cholesterol from the circulation and peripheral tissue to the liver

Question 26

Enzyme that catalyzes the dephosphorylation of phosphatidate to diacylglycerol

Answer 26

Lipin

Question 27

Lipid Storage droplets defined

Answer 27

The organelle that stores neutral lipids in the cells

Question 28

Lipolysis Defined

Answer 28

The regulated mobilization and breakdown of triacylglycerols

Question 29

**Lipolysis defined (extra)

Answer 29

triggered by hormone signaling

Occurs at low background levels

Regulated by AMP kinase

Question 30

Types of triacylglycerol storage

Answer 30

Acute and chronic

Question 31

Acute storage

Answer 31

+ Mobilization occurs over minutes to hours

+cAMP is manipulated via hormones and cell signaling cascades

Question 32

Chronic storage

Answer 32

+ Occurs over weeks or longer

+ Partially affected by both levels of gene expression and diet