Carbohydrates: Structure and Classification Quiz

Which of the following best defines a carbohydrate?

• A molecule that contains only carbon and hydrogen

• A polyhydroxy aldehyde or ketone (and their derivatives)

• A compound made only of proteins

• A molecule that contains only nitrogen and oxygen

Which of the following is an example of a polyhydroxy compound?

• A molecule with only one hydroxyl group

• A molecule with several hydroxyl (-OH) groups

• A molecule with no hydroxyl groups

• A molecule with only carboxyl groups

What is the structural difference between an aldehyde and a ketone group in carbohydrates?

• Aldehyde has a carbonyl group at the end of the carbon chain, ketone has it in the middle

• Both have carbonyl groups at the end of the chain

• Ketone has a hydroxyl group at the end, aldehyde does not

• Aldehyde has no oxygen atoms, ketone does

Which of the following is a correct example of an aldose and a ketose, respectively?

• Glyceraldehyde and dihydroxyacetone

• Glucose and fructose

• Sucrose and lactose

• Galactose and mannose

Which of the following is NOT an objective for students studying carbohydrates in this material?

• Define the term carbohydrate

• Compare and contrast glucose, fructose, and galactose

• Describe the process of protein synthesis

• Demonstrate knowledge of the structure and composition of disaccharides

Why is it important to understand the difference between D and L isomers of carbohydrates?

• Because only D isomers are primarily found in the human body

• Because L isomers are always toxic

• Because D isomers are only found in plants

• Because L isomers are the only ones that can be digested

Which of the following best describes monosaccharides?

• Complex sugars

• Simple sugars

• Non-reducing sugars

• Polysaccharides

Which of the following is NOT an example of an aldose?

• Glucose

• Ribose

• Fructose

• Erythrose

What is the main metabolic fuel of the body?

• Sucrose

• Glucose

• Fructose

• Lactose

How are stereoisomers of monosaccharides grouped?

• By the number of hydrogen atoms

• By the number of carbons and by carbonyl group

• By the number of oxygen atoms

• By the number of phosphate groups