Cell Structure and Function

Which enzyme breaks down urea into ammonia and carbon dioxide?

• Amylase
• Protease
• Lipase
• Urease

What is the main function of hemoglobin?

• Digest fats
• Synthesize DNA
• Transport oxygen in blood
• Regulate blood sugar

What is the process called where a sugar undergoes interconversion between α and β forms in solution?

• Epimerization
• Anomerization
• Tautomerism
• Mutarotation

Which of the following amino acids contains sulfur?

• Serine
• Asparagine
• Leucine
• Methionine

Which pyrimidine base is found exclusively in DNA?

• Cytosine
• Uracil
• Adenine
• Thymine