Question

The vitamin which can be synthesized in the gut by bacterial action is

• A. Vitamin B${}_1$
• B. B${}_2$
• C. Vitamin B${}_{12}$
• D. All of the above

Answer 1

The correct option is D All of the above

In the large intestine, water is absorbed into the blood as the waste materials move through the colon. The symbiotic bacteria such as E. coli and Streptococcus faecalis, normally residing in the healthy human colon, feed on protein contents of chyle breaking them into amino acids which are absorbed into the blood. The colon bacteria also synthesize vitamins B1, B2, biotin, folic acid and K which are absorbed. They also convert bile pigments into brown pigments which give colour to faeces.

Thus, the correct answer is option D.