Monosaccharides have :

Question

Accepted Answer

Monosaccharides are the simplest form of carbohydrates and are fundamental units of sugar. They consist of a single sugar molecule, which is why Option 1, "only single unit of sugar," is the correct answer. Monosaccharides cannot be broken down into simpler sugars by hydrolysis, making them the most basic form of carbohydrates. Common examples of monosaccharides include glucose, fructose, and galactose, each of which contains one sugar unit.

Now, let's examine why the other options are incorrect:

Option 2: "two units of sugar." This option describes disaccharides, not monosaccharides. Disaccharides are composed of two monosaccharide units linked together. Examples include sucrose (table sugar), lactose, and maltose. Therefore, this option does not accurately describe monosaccharides.

Option 3: "more than two units of sugar." This option refers to oligosaccharides and polysaccharides, which are composed of more than two monosaccharide units. Polysaccharides, such as starch, glycogen, and cellulose, are complex carbohydrates made up of long chains of monosaccharide units. Thus, this option is incorrect for monosaccharides.

Option 4: "no unit of sugar." This option is incorrect because monosaccharides are defined by having a single sugar unit. Saying they have no unit of sugar contradicts the very definition of monosaccharides.

In conclusion, Option 1 is the correct answer because monosaccharides are characterized by having only a single unit of sugar, distinguishing them from more complex carbohydrates like disaccharides and polysaccharides.