Protein Structure and Metabolism Quiz

Which level of protein structure is defined by the specific sequence of amino acids?

• Secondary

• Tertiary

• Primary

• Quaternary

Which protein structure level includes α-helices and β-sheets stabilized by hydrogen bonds?

• Primary

• Secondary

• Tertiary

• Quaternary

What type of bond stabilizes the secondary structure of proteins?

• Disulfide bond

• Ionic bond

• Hydrogen bond

• Peptide bond

Which protein structure level is responsible for the 3D folding of a polypeptide chain?

• Primary

• Secondary

• Tertiary

• Quaternary

Which protein structure involves interactions between multiple polypeptide chains?

• Primary

• Secondary

• Tertiary

• Quaternary

What is the main function of the glucose-alanine cycle during exercise?

• To increase lactic acid in muscles

• To remove nitrogen waste and preserve muscle protein

• To enhance glycogen storage

• To increase oxygen delivery to muscles

Which amino acids bypass liver metabolism and are absorbed directly by muscle tissue?

• Alanine, glycine, serine

• Leucine, isoleucine, valine

• Glutamine, proline, tyrosine

• Methionine, histidine, phenylalanine

What is the total number of high-energy phosphate bonds consumed in one complete urea cycle?

• 2

• 3

• 4

• 5

What determines whether an amino acid is glucogenic or ketogenic?

• Its nitrogen content

• Its carbon chain length

• The metabolite it produces

• The presence of sulfur

Glucogenic amino acids are converted into which of the following?

• Acetyl-CoA

• Ketone bodies

• Fatty acids

• Pyruvate or TCA intermediates