Question

URGENT! Identify each of the true statements about what happens when you eat a slice of 100% whole wheat bread made with whole wheat, water, honey, and salt:

1) the starches are NOT enzymatically digested until they reach the duodenum; that is, no starch digestion occurs in the mouth or stomach

2) analyses hydrolyze the starches in maltose

3) the pancreas is one place that produces the enzymes that will digest the starch

4) the disaccharides from the bread and from starch digestion will be hydrolyzed at the brush border (micrvilli) of the small intestine

5) bacteria will “eat” the fiber from the wheat germ that passed undigested into the large intestine

6) pancreatic lipase will digest the sodium chloride from the salt

7) enzymatic digestion of the disaccharides will produce single amino acids, which will be absorbed through tunnels in cells and be transported to blood capillaries

8) cells will take in disaccharides and package then into a chylomicron which will be transported to a lacteal

9) glucose will be absorbed through channels in cells lining the small intestine and be transported to blood capillaries

10) you will get about 4 kcalories from each gram of starch and sugar from the bread, but almost no kcalories from the fiber

Answer 1

1. The first statement is wrong as it says that starch is digested in the only in the intestine. Instead, the starch can be digested in the mouth by the amylase.

2. The second statement is correct. Amylase hydrolyzes the starch into maltose.

3. This statement is also wrong as pancreas and mouth both produce the enzyme that hydrolyzes the starch.

4. This statement is correct as disaccharides are hydrolyzed at the brush border.

5. This statement is also correct as food in the large intestine is digested by the bacteria.

6. This statement is wrong as lipase will not digest the salt.

7. This statement is wrong as disaccharides after hydrolysis produces monosaccharides, not amino acids.

8. This statement is wrong as disaccharides are not converted to chylomicrons only fats are converted to chylomicrons.

9. This statement is also correct as glucose is absorbed by the channels.

10. This is also correct as we get 4Kcal from carbohydrates and none from the fiber.