Chemical Nature of Carbohydrates

What are carbohydrates chemically defined as?

• Polyhydroxyalcohols with a functional aldehyde or keto group

• Proteins with a functional amine group

• Lipids with a functional ester group

• Nucleic acids with a functional phosphate group

Fill in the blank: The general formula for carbohydrates is _____.

• Cn(H2O)n

• C2H5OH

• CH4

• C6H12O6

Which of the following carbohydrates contains an aldehyde group?

• Glucose

• Fructose

• Both

• Neither

Which of the following carbohydrates contains a keto group?

• A) Glucose

• B) Fructose

• C) Both

• D) Neither

Carbohydrates are made up of which two elements as shown in the formula Cn(H2O)n?

• Carbon and Water

• Carbon and Oxygen

• Hydrogen and Oxygen

• Carbon and Hydrogen

Which organic molecules are the most abundant in nature?

• Proteins

• Carbohydrates

• Lipids

• Nucleic acids

Carbohydrates provide a significant fraction of the dietary ______ for most organisms.

• calories

• vitamins

• minerals

• enzymes

What is the storage form of energy in the body according to the slide?

• Proteins

• Lipids

• Carbohydrates

• Vitamins

Carbohydrates serve as cell membrane components that mediate some forms of intercellular communication.

• True

• False

Which of the following is NOT a type of carbohydrate according to the classification chart?

• Monosaccharides

• Disaccharides

• Oligosaccharides

• Proteins