Multiple Choice
Which of the following best describes simple carbohydrates, also known as monosaccharides?
28. Carbohydrates
Monosaccharide
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How many carbon rings are typically found in a monosaccharide?
A
One
B
Four
C
Three
D
Two
Verified step by step guidance1
Understand the definition of a monosaccharide: Monosaccharides are the simplest form of carbohydrates and consist of a single sugar unit. They are the building blocks for more complex carbohydrates.
Recognize the typical structure of a monosaccharide: Monosaccharides generally have a backbone of carbon atoms, which can form a ring structure. The most common monosaccharides are glucose, fructose, and galactose.
Identify the ring formation in monosaccharides: In aqueous solutions, monosaccharides often form cyclic structures. This occurs through an intramolecular reaction where the carbonyl group reacts with a hydroxyl group, forming a hemiacetal or hemiketal.
Determine the number of carbon rings: The cyclic form of monosaccharides typically involves a single ring structure. For example, glucose forms a six-membered ring known as a pyranose, while fructose forms a five-membered ring known as a furanose.
Conclude the typical number of carbon rings in a monosaccharide: Based on the common examples and their structures, monosaccharides typically contain one carbon ring in their cyclic form.
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