Carbohydrates

Carbohydrates are

• Organic compounds which compose of carbon, oxygen, hydrogen, nitrogen or not.

• Inorganic compounds

• Metallic compounds

• Non-metallic compounds

How many do classes of carbohydrate have?

• 1 class: monosaccharides

• 2 classes: monosaccharides, disaccharides

• 3 classes: monosaccharides, disaccharides and oligosaccharides

• 4 classes: monosaccharides, disaccharides, oligosaccharides, polysaccharides

The main functions of carbohydrates for human body:

• Main source of energy

• Spare protein from being burned so it can be used to build and repair

• Dietary fiber can help lower blood cholesterol

• Part of connective tissues, some hormones and enzymes and genetic material.

• All above answers.

Monosaccharides include three main types:

• Glucose, fructose and galactose

• Retinol, Alpha-tocopherol and Menadione

• Arginine, Glycine and Serin

• All above answers are wrong!

What is the main difference between glucose and fructose structure?

• Glucose makes a six membered ring, and fructose makes a five membered ring.

• Glucose forms a pyranose ring structure, whereas fructose makes a furan ring structure

• Glucose is an aldohexose, whereas fructose is a ketohexose.

• All three answers are right!

Glucose is

• Milk sugar

• Blood sugar

• Honey sugar

• All above mentions are wrong!

What are the disaccharides?

• One class of carbohydrate which are formed when three monosaccharides are joined together by glycosidic bonds.

• One class of carbohydrate which are formed when two monosaccharides are joined together by glycosidic bonds.

• One class of carbohydrate which are formed when four monosaccharides are joined together by glycosidic bonds.

• One class of carbohydrate which are formed when five monosaccharides are joined together by glycosidic bonds.

Maltose is formed by reaction between:

• Glucose and Galactose

• Glucose and Fructose

• Glucose and Glucose

• Galactose and Fructose

Lactose is formed by reaction between:

• Glucose and Glucose

• Galactose and Fructose

• Fructose and Glucose

• Galactose and Glucose

Sucrose is formed by reaction between:

• Glucose and Fructose

• Glucose and Glucose

• Fructose and Galactose

• Galactose and galactose