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Why is it necessary for polysaccharides, such as starch or cellulose, to be digested outside of the cell even though disaccharides, such as lactose or sucrose, are digestible inside the cell?

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Tod Thiel
Tod ThielLv2
28 Sep 2019

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Related questions

How are the structure and properties of proteoglycans related to their function as part of the extracellular matrix?

Explain how the difference in structure between large, structurally simple polysaccharides (think starch or cellulose) and small structurally complex polysaccharides (like those found on the cell surface glycoproteins) is related to their distinct functions.

3. Carbohydrates A. Carbohydrate digestion begins in the oral cavity. Name the enzyme that initiates carbohydrate digestion. Name the 3 sets of organs that secrete this enzyme. B. Describe how carbohydrates are chemically digested in the small intestine. Include a discussion of brush border enzymes. C. Does the pancreas release any enzymes which chemically digest carbohydrates? If yes, name it (them). How does pancreatic juice enter the small intestine? D. Fiber (AKA cellulose in plant cell walls) is not digestible. Why not? Despite not being digestible, fiber is beneficial to our health. Why?

4. Proteins A. Where are proteins first digested chemically? What enzyme initiates protein digestion? B. Does the pancreas release any enzymes that chemically digest proteins? If yes, name it (them). C. Describe 3 ways in which the body uses these protein subunits.

Can somebody check if my answer is rght? Thank you

Complex carbohydrates

Indicate whether each of the following statements about polysaccharides is True or False.

1. Polysaccharides are long polymers made of many nucleotides that have been joined through dehydration synthesis. False
2. Cellulose is the main storage polysaccharide in plants while glycogen is an important storage polysaccharide in many animals. False
3. Both starch and glycogen are composed of α-glucose subunits. True
4. Starch is composed of amylose and amylopectin, which are unbranched and branched chains of α-glucose subunits, respectively. False
5. Like amylopectin, glycogen is insoluble in water, but it has a longer average chain length and fewer branches. True
6. Although some polysaccharides are used to store energy, others serve as structural material for cells. True
7. The principal structural polysaccharide in plants is starch. True
8. Cellulose is composed of a long, branched chain of β-glucose subunits. True
9. The starch-hydrolyzing enzymes produced by most organisms cannot break the bond between two α -glucose subunits because they only recognize β linkages. False
10. Chitin is a structural polysaccharide found in the exoskeleton of arthropods and the cell wall of many fungi. True

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