Question 6:
The most abundant monosaccharide in nature is:
Most Abundant Monosaccharide in Nature: Glucose Explained
Glucose stands out as the most abundant monosaccharide in nature, playing a central role in energy production and plant metabolism. This article breaks down the multiple-choice question on this topic, highlighting why glucose is the correct choice.
Correct Answer
The correct answer is (B) Glucose.
Glucose (C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>) is the primary product of photosynthesis in plants and algae, making it ubiquitous in the biosphere. Its prevalence stems from its stability and role as a building block for complex carbohydrates like starch and cellulose.
Option Breakdown
| Option | Type | Explanation | Why Incorrect |
|---|---|---|---|
| (A) Maltose | Disaccharide | Maltose forms from two glucose units via dehydration synthesis, common in germinating grains. | Not a monosaccharide; it’s a dimer. |
| (B) Glucose | Monosaccharide | D-glucose is the most widespread simple sugar, fueling cellular respiration worldwide. | Correct choice. |
| (C) Lactose | Disaccharide | Lactose combines glucose and galactose, found mainly in milk. | Disaccharide, not free in nature. |
| (D) Amylose | Polysaccharide | Amylose is a linear starch polymer of many glucose units, stored in plants. | Complex carbohydrate, not a monosaccharide. |
Why Glucose Dominates
Glucose’s abundance arises from photosynthesis, yielding vast quantities in plant biomass. Unlike others, its β-D form favors equatorial hydroxyl groups, enhancing reactivity for glycans. In exams like biology or biochemistry, this fact tests carbohydrate classification knowledge.
