Multiple Choice
When a disinfectant is used on your work surface in a microbiology laboratory, what is the primary purpose?
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1. Introduction to Microbiology
Introduction to Microbiology
Multiple Choice
Bacterial flora in the large intestine do not produce __________.
A
insulin
B
vitamin K
C
short-chain fatty acids
D
biotin
Verified step by step guidance1
Step 1: Understand the role of bacterial flora in the large intestine. These bacteria are known to synthesize certain substances that are beneficial to the host, such as vitamins and short-chain fatty acids.
Step 2: Identify the substances commonly produced by intestinal bacteria. These include vitamin K, which is important for blood clotting, and biotin, a B-vitamin involved in metabolism. They also produce short-chain fatty acids through fermentation of dietary fibers.
Step 3: Recognize that insulin is a hormone produced by the pancreas, not by bacteria. It regulates blood glucose levels and is not synthesized by intestinal flora.
Step 4: Compare the options given: vitamin K, short-chain fatty acids, and biotin are all products of bacterial metabolism in the large intestine, whereas insulin is not.
Step 5: Conclude that the correct answer is the substance not produced by bacterial flora, which is insulin.
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