Bacteria in the digestive tract do all of the following EXCEPT:单项选择题

A

produce vitamin K

B

produce gas

C

protect mucous membrane

D

break down fibers

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Question textThe digestive tract of many organisms contains commensal microbes to assist in the digestion of their food. The role for these microbes varies as a function of the consumers’ diets. Answer 1 Question 35[select: , Herbivores, Omnivores, Carnivores] tend to have longer and more complex digestive tracts with a more prominent role for microbes to digest complex sugars. These commensal microbes can not only extract more absorbable energy from the food, but their own biomass can provide a major source of Answer 2 Question 35[select: , protein, fat, carbohydrate] to the consumer. Answer 3 Question 35[select: , Foregut fermenters, Hindgut fermenters], such as ruminants, have their microbial fermentation chambers Answer 4 Question 35[select: , after, before] the stomach, while Answer 5 Question 35[select: , hindgut fermenters, foregut fermenters], such as rabbits, have their fermentation chambers Answer 6 Question 35[select: , after, before] their stomach. To capitalise on the extra nutritional value offered by the microbiota, hindgut fermenters may engage in Answer 7 Question 35[select: , cannibalism, over eating, coprophagy].

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