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Multiple Choice Quiz
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1
Which of the following statements regarding digestion and absorption of carbohydrates is true?
A)Carbohydrate digestion begins in the mouth.
B)Polysaccharides are broken down to monosaccharides by amylase.
C)Disaccharides are actively transported across the epithelium of the small intestine.
D)All of the above.
E)None of the above.
2
The emulsification of fats
A)results in the formation of small fat droplets.
B)depends upon the amphipathic structure of bile salts.
C)results in the formation of micelles.
D)A and B.
E)A, B and C.
3
Which of the following statements regarding lipid digestion and absorption is true?
A)In the absence of bile salts, no digestion of lipids would occur.
B)Pancreatic lipase emulsifies lipids.
C)The products of lipid digestion diffuse into capillaries in the vicinity of the intestinal epithelium.
D)The products of lipid digestion travel in the circulatory system in the form of micelles.
E)The products of lipid digestion are resynthesized into triacylglycerols in intestinal epithelial cells.
4
The function of the enzyme enterokinase is to
A)cause bicarbonate secretion by the pancreas.
B)stimulate secretion of gastrin by the stomach.
C)activate trypsinogen into trypsin.
D)activate pepsinogen into pepsin.
E)cleave dipeptides into amino acids.
5
The gall bladder
A)synthesizes bile.
B)stores bile.
C)is stimulated to contract by CCK.
D)B and C.
E)A, B and C.
6
Which of the following statements about the transport of the absorbed products of fat digestion is true?
A)Free fatty acids and monoglycerides are transported to the liver via the hepatic portal vein.
B)Triacylglycerides are transported to the liver via the hepatic portal vein.
C)Triacylglycerides are transported through the lymphatics in lipoproteins called chylomicrons.
D)Free fatty acids and monoglycerides are transported through the lymph in lipoproteins called chylomicrons.
E)Triacylglycerides are transported through the lymphatics in lipoproteins called LDL.
7
A greater volume of material daily enters the lumen of the gastrointestinal tract from the body than is ingested as food and water.
A)True
B)False
8
The products of lipid digestion diffuse into the intestinal epithelium as micelles.
A)True
B)False
9
The secretion of gastrin by cells in the stomach lining is stimulated by increasing gastric acidity.
A)True
B)False
10
Fat soluble vitamins are absorbed in the small intestine by diffusion or mediated transport whereas water soluble vitamins are absorbed in a similar way as fats are absorbed, through emulsification.
A)True
B)False





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