You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Bonds in cellulose that make it resistant to digestion is: and explain in detail?
Cellulose is the chief constituent of plant cell walls. It is insoluble and consists of b-D -glucopyranose units linked by b,1-4 bonds to form long, straight chains strengthened by cross-linking hydrogen bonds. Mammals lack any enzyme that hydrolyzes the b1 -4 bonds, and so cannot digest cellulose. Ref: Harper 28th edition, chapter 14.