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 (C6H12O6) 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.
