Which vitamin is synthesized by intestinal microbiota?
Show answer & explanation
Correct answer: B
Explanation
Answer: Vitamin K.
Explanation:
Beneficial bacteria (microbiota) present in the human large intestinesuch as Escherichia coliprimarily synthesize Vitamin K (specifically K2, or menaquinone) and certain B-complex vitamins (such as B12, folate, and biotin). Vitamin K is essential for blood clotting. Although we obtain Vitamin K1 from our diet, the Vitamin K2 produced by intestinal bacteria fulfills a significant portion of our body's daily requirements. Excessive consumption of antibiotics can destroy these bacteria, thereby increasing the risk of a deficiency of this vitamin in the body.
Additional Points:
Vitamin C: This is water-soluble and must be obtained through one's diet (specifically from citrus fruits).
Vitamin D: This is synthesized in the skin in the presence of sunlight.
Vitamin E: This is a fat-soluble vitamin that primarily functions as an antioxidant.
Potential Exam Questions and Answers:
Question: Which vitamin is essential for blood clotting? Answer: Vitamin K.
Question: Which vitamins do intestinal bacteria help synthesize? Answer: Vitamin K and B12.