Cellulose could provide an abundant and cheap form of glucose for humans. Why is cellulose not a source of nutrients for humans? Animals use starch and glycogen as an energy source, whereas plants use cellulose for energy. Humans cannot absorb the hydrolyzed form of cellulose. Vertebrate enzymes hydrolyze (α 1-4) glucose linkages, but not glucose in the ẞ configuration. Cellulose digestion must occur in a basic environment, but the human gut is acidic. Humans, and most vertebrates, lack the enzyme cellulase.

Cellulose could provide an abundant and cheap form of glucose for humans. Why is cellulose not a source of nutrients for humans? Animals use starch and glycogen as an energy source, whereas plants use cellulose for energy. Humans cannot absorb the hydrolyzed form of cellulose. Vertebrate enzymes hydrolyze (α 1-4) glucose linkages, but not glucose in the ẞ configuration. Cellulose digestion must occur in a basic environment, but the human gut is acidic. Humans, and most vertebrates, lack the enzyme cellulase.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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