Proteins

What are proteins?

• Nucleic acids

• Simple macromolecules

• Carbohydrates

• Complex macromolecules

How many common amino acids are there in foods?

• 25

• 20

• 15

• 10

What is the main function of proteins in the body?

• Perform most of the work in cells

• Produce hormones

• Store energy

• Transport oxygen

What type of bond is formed between two amino acids?

• Peptide bond

• Hydrogen bond

• Ionic bond

• Covalent bond

Which of the following structures is characteristic of the secondary structure of proteins?

• Tertiary structure

• Alpha helix structure

• Polypeptide chains

• Beta sheet structure

What is an essential amino acid?

• An amino acid that is found only in plants

• An amino acid that is not found in proteins

• An amino acid that is obtained from the diet

• An amino acid that the body can synthesize

What type of structure does hemoglobin have?

• Secondary structure

• Tertiary structure

• Primary structure

• Quaternary structure

What is the characteristic of the tertiary structure of a protein?

• Parallel polypeptide chains

• Helical structure

• Specific three-dimensional shape

• Amino acid sequence

What type of food is a source of high quality proteins?

• Meat, fish, and egg

• Grains

• Fruits and vegetables

• Sugar and fats

What forms the triple helix structure in proteins?

• One aminoacid chain

• Carbohydrate chain

• Three polipeptide chains together

• One aminoacid chain