Carbohydrates Quiz

What are monosaccharides?

• Compounds with four carbohydrate molecules

• Compounds with two carbohydrate molecules

• Compounds with one carbohydrate molecule

• Compounds with three carbohydrate molecules

Which of the following is a disaccharide?

• Glucose

• Fructose

• Galactose

• Sucrose

Answer explanation

Sucrose is a disaccharide composed of glucose and fructose. In contrast, glucose, fructose, and galactose are all monosaccharides, which are single sugar units.

What is starch classified as?

• Monosaccharide

• Disaccharide

• Polysaccharide

• Simple sugar

Answer explanation

Starch is classified as a polysaccharide because it is a complex carbohydrate made up of long chains of glucose molecules. Unlike monosaccharides and disaccharides, which are simpler sugars, polysaccharides consist of many sugar units.

What is the main function of carbohydrates in the body?

• Building proteins

• Energy production

• Producing vitamins

• Regulating temperature

Answer explanation

The primary function of carbohydrates in the body is energy production. They are broken down into glucose, which is used as a key energy source for cells, making this the correct choice over the other options.

Which carbohydrate is formed during starch digestion?

• Lactose

• Maltose

• Galactose

• Dextrin

Answer explanation

During starch digestion, enzymes break it down into smaller units, primarily maltose, which is a disaccharide composed of two glucose molecules. Therefore, maltose is the correct carbohydrate formed.

What happens to excess carbohydrates in the body?

• They are turned into fats

• They are excreted

• They are stored as glycogen

• They are converted into proteins

Answer explanation

Excess carbohydrates are primarily stored as glycogen in the liver and muscles. When glycogen stores are full, any additional carbohydrates can be converted into fats, but the immediate response is glycogen storage.

Which carbohydrate is not sweet?

• Fructose

• Glucose

• Starch

• Sucrose

Answer explanation

Starch is a polysaccharide and does not have a sweet taste, unlike fructose, glucose, and sucrose, which are all simple sugars and sweet in flavor.

Which of the following is a function of carbohydrates?

• Producing hormones

• Building muscles

• Sparing protein

• Sparing fats

Answer explanation

Carbohydrates primarily serve as a source of energy. By providing energy, they help spare protein from being used for energy, allowing it to be used for muscle building and repair instead.

What is the main source of energy for the body?

• Fats

• Proteins

• Vitamins

• Carbohydrates

Answer explanation

Carbohydrates are the body's primary source of energy, providing glucose that fuels cells. While fats and proteins can also provide energy, carbohydrates are the most efficient and preferred source for quick energy needs.

Which monosaccharide is found only in milk?

• Glucose

• Fructose

• Galactose

• Sucrose

Answer explanation

Galactose is a monosaccharide that is primarily found in milk, specifically as part of lactose, the sugar in milk. Glucose and fructose are found in various foods, while sucrose is a disaccharide made of glucose and fructose.