Answer: (B) Glucose
Explanation: Glucose is a simple sugar known as a monosaccharide, which is the most basic form of sugar. Glycogen and starch are polysaccharides, and sucrose is a disaccharide.

Answer: (C) Amino acids
Explanation: Proteins are made up of amino acids, which are organic compounds that serve as the building blocks for protein synthesis. Fatty acids are components of fats, nucleotides are the building blocks of nucleic acids (like DNA and RNA), and monosaccharides are simple sugars that form carbohydrates.

Answer: (A) Carbon, hydrogen, oxygen
Explanation:  Carbohydrates are organic compounds primarily composed of three elements: carbon, hydrogen, and oxygen, typically in a 1:2:1 ratio.

Answer: (B) Sugars
Explanation: Carbohydrates are primarily known as sugars because they consist of molecules like glucose, fructose, and sucrose, which are forms of simple and complex sugars that provide energy to the body.

Answer: (C) Monosaccharides
Explanation: Monosaccharides are the simplest form of carbohydrates, consisting of a single sugar unit, which cannot be broken down into smaller carbohydrates.

Answer: (A) Monosaccharides, Disaccharides, Polysaccharides
Explanation: Carbohydrates are classified based on the number of sugar units they contain: monosaccharides (single sugar), disaccharides (two sugars), and polysaccharides (many sugars).

Answer: (C) Sucrose
Explanation: Sucrose is a disaccharide because it is composed of two monosaccharides: glucose and fructose. Glucose and fructose are single sugar units (monosaccharides), while cellulose is a polysaccharide.

Answer: (C) Oligosaccharides
Explanation: Oligosaccharides are carbohydrates composed of 3 to 10 sugar units. Monosaccharides are single sugar units, disaccharides consist of two sugar units, and polysaccharides are long chains of sugar units.

Answer: (A) Glucose
Explanation: Glucose is a hexose monosaccharide because it has six carbon atoms in its structure. Ribose, Galactose, and Deoxyribose are also sugars, but they differ in the number of carbon atoms or their structural characteristics.

Answer: (B) C6H12O6
Explanation: The chemical formula for glucose is C6H12O6. This formula indicates that glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms, which is the characteristic composition of this simple sugar.