W3006 01  Quiz 5!                                                LAST FIVE DIGITS OF ID:________________________

 Circle all correct answers. 

 1.  All of these increase as a result of fat entering the duodenum except

a.  contraction of gall bladder   b. delay in emptying of the stomach    c.  HCl secretion in the stomach   d. pancreatic enzyme secretion    d.

2. Which is the correct order for lipid movement during digestion?

1. chylomicrons form

2. emulsification by bile

3. dissolve in epithelial cell membrane

4. hydrolysis by pancreatic lipase

5. diffuse into lacteals

a.  4,3,2,1,5    b. 2,4,3,1,5,     c. 2,1,4,3,5    d. 3,2,4,5,1   e. 4,2,3,5,1

3. Pepcid AC and Zantac are drugs that help people with gastric ulcers. They inhibit the production of HCl.  If taken for a long time, they are most likely to affect the digestion of

a. carbohydrates    b. lipids     c. proteins

4.  Parasympathetic stimulation  will cause ____ in amylase in the mouth.

a. an increase    b. a decrease   c. no change

5. Assume that an endopeptidase and an exopeptidase are each allowed sufficient time to catalyze their substrate.  In which case would the products be smaller in size?  After being catalyzed by the a. endopeptidase   b. exopeptidase

Exopeptidases cut off the terminal amino acids, and so can produce single amino acids.  Endopeptidases cut peptide bonds between two specific amino acids, and so lead to production of short peptides.

6. When the duct from the gallbladder is blocked, feces produced appear whitish, because they lack the pigment normally contributed by  a. bilirubin  b. hemoglobin   c. fats  d. iron  e.  ferritin   f. transferring

7. Intrinsic factor is necessary for the absorption of 

a. calcium    b. iron    c. vitamin B12   d. bile   e. all of these, as long as they are eaten intrinsically

8. Insulin increases glucose uptake by the liver by increasing

a. glucose transport proteins in the membrane

b. physophorylation of glucose after it enters the cell

c. gluconeogenesis

d. glycogenolysis

9.  Cholesteryl esters are found in the  a. core  b. surface of a lipoprotein.

10. Cholesterol from the tissues is delivered to the liver mostly by

a. chylomicron remnants  b. VLDL  c. IDL  d. LDL  e. HDL

11.  People who are lactose intolerant are unable to tolerate  a. lactose   b. lactase  c. other people.

12. A meal of fatty foods tends to stay in the stomach for longer than a meal which is made mostly of carbohydrates.  Explain how fatty foods inhibit the emptying of the stomach.

Fat in the small intestine (4) stimulates cells there to secrete the hormones secretin and CCK (and GIP, maybe, to a lesser extent) (4)  , which keep the pyloric sphincter contracted and so decrease the rate of gastric emptying. (4)