Textbook Question
The term dermatophyte refers to_____.
a. pathogenicity
b. where a fungus grows
c. method of spread
d. pigmentation
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21. Principles of Disease
The Human Microbiome
Multiple Choice
Which of the following vitamins can be produced by intestinal bacteria in the human gut?
A
Vitamin A (retinol)
B
Vitamin D (cholecalciferol)
C
Vitamin K (menaquinones)
D
Vitamin C (ascorbic acid)
Verified step by step guidance1
Step 1: Understand the role of intestinal bacteria in vitamin synthesis. Certain gut bacteria have the ability to synthesize vitamins that the human body cannot produce on its own.
Step 2: Review the list of vitamins provided and identify which are typically synthesized by gut microbiota. Vitamins such as Vitamin A, D, and C are generally obtained from diet or sunlight (in the case of Vitamin D).
Step 3: Recognize that Vitamin K, specifically menaquinones, is known to be produced by intestinal bacteria in the human gut. This vitamin plays a crucial role in blood clotting and bone metabolism.
Step 4: Recall that Vitamin A (retinol) is primarily obtained from dietary sources like liver and carrots, Vitamin D (cholecalciferol) is synthesized in the skin upon sunlight exposure, and Vitamin C (ascorbic acid) must be consumed through diet as humans cannot synthesize it.
Step 5: Conclude that among the options, Vitamin K (menaquinones) is the vitamin produced by intestinal bacteria in the human gut.
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