Biochemistry Quiz

What is the primary function of the citric acid cycle in metabolism?

• Generate energy through oxidation

• Produce glucose for energy

• Regulate body temperature

• Store fat for future use

Which of the following is a product of glycolysis?

• Water

• Carbon dioxide

• ATP

• Glucose

What is the quaternary structure of a protein?

• The secondary structure of a protein

• The primary structure of a protein

• The tertiary structure of a protein

• Arrangement of multiple protein subunits

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

• Primary structure

• Quaternary structure

• Secondary structure

• Tertiary structure

What is the role of insulin in carbohydrate metabolism?

• Inhibits glucose uptake into cells

• Causes blood sugar levels to rise

• Has no effect on blood sugar levels

• Regulates blood sugar levels and promotes glucose uptake into cells

Which enzyme is responsible for breaking down triglycerides into fatty acids and glycerol?

• amylase

• pepsin

• trypsin

• lipase

What is the function of phospholipids in the body?

• Provide structure and regulate movement of molecules in and out of the cell

• Produce energy for the cell

• Store genetic information in the cell

• Act as enzymes for cellular reactions

Which of the following is a component of a nucleotide?

• Carbon dioxide

• Water

• Phosphate group

• Chlorophyll

What is the role of glucagon in carbohydrate metabolism?

• It promotes glucose uptake into cells

• It causes blood sugar levels to rise

• It has no effect on blood sugar levels

• It inhibits glucose uptake into cells

Which of the following enzymes is responsible for the rate-limiting step in fatty acid synthesis?

• Acetyl-CoA carboxylase

• Hormone-sensitive lipase

• Carnitine palmitoyltransferase I

• Fatty acid synthase

Answer explanation

Acetyl-CoA carboxylase catalyzes the carboxylation of acetyl-CoA to form malonyl-CoA, which is the rate-limiting step in fatty acid synthesis.