I WONDER - What Are Fingernails Made From?

What is keratin primarily classified as?

• A type of protein

• A type of carbohydrate

• A type of lipid

• A type of vitamin

Where is keratin naturally found in humans?

• In the muscles and tendons

• In the hair and nails

• In the skin and bones

• In the blood and lymph

Which animals have keratin in their bodies?

• Only birds

• Horses and birds

• Only mammals

• Fish and reptiles

What is the Greek origin of the word 'keratin'?

• It means 'hoof'

• It means 'horn'

• It means 'feather'

• It means 'nail'

Which of the following best describes keratin's properties?

• Soft and soluble

• Brittle and soluble

• Tough and insoluble

• Flexible and soluble