Plant materials, such as fruits and vegetables, are...

Plant materials, such as fruits and vegetables, are difficult to digest because they are difficult to break down. How are humans able to obtain nutrients from fruits and vegetables? a. Humans produce cellulase, which breaks down cellulose. b. Intestinal flora have enzymes that break down some of the fiber. c. Bile is released from the gallbladder to break down fiber. d. In the stomach, pepsin is produced to break down plant material.

Plant materials, such as fruits and vegetables, are difficult to digest because they are difficult to break down. How are humans able to obtain nutrients from fruits and vegetables?

a. Humans produce cellulase, which breaks down cellulose.
b. Intestinal flora have enzymes that break down some of the fiber.
c. Bile is released from the gallbladder to break down fiber.
d. In the stomach, pepsin is produced to break down plant material.

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Key Concepts

Human Digestive Enzymes

Human digestive enzymes are specialized proteins that catalyze the breakdown of macromolecules, such as proteins, carbohydrates, and fats, into simpler molecules that can be absorbed by the body. However, these enzymes do not include cellulase, which is necessary for digesting cellulose found in plant cell walls.

Plant Cell Wall Composition (Cellulose)

Cellulose is a complex carbohydrate and a major component of plant cell walls, providing structural strength and rigidity. Its complex beta-glycosidic bonds make it resistant to breakdown by the human digestive system, requiring alternative mechanisms for nutrient extraction.

Gut Microbiota

Gut microbiota refers to the diverse community of microorganisms living in the human gastrointestinal tract. These microbes produce enzymes that can break down otherwise indigestible components such as cellulose and other dietary fibers, fermenting them into short-chain fatty acids and other metabolites that contribute to human energy and health.

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