Which statement about bacteria in the human digestive system is accurate?
AAll bacteria in the gut are harmful and cause disease
BMany gut bacteria are beneficial and assist with digestion and vitamin production
CGut bacteria play no role in the immune system
DThe human gut naturally contains no bacteria at all
Explanation
Many of the bacteria naturally living in the human gut are beneficial, forming part of what’s known as the gut microbiome, and they assist with digesting certain food components, producing some vitamins like vitamin K, and supporting overall immune system function. This is quite different from harmful, disease-causing bacteria, and highlights that not all bacteria are dangerous to health. Disruption of this beneficial bacterial community, sometimes caused by antibiotic use, can occasionally lead to digestive issues. Explore more Everyday Science MCQs on mcqstutor to keep practicing.
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