Cell Structure and Function

What is the function of ligase in DNA replication?

• Unwinds DNA
• Adds nucleotides
• Proofreads DNA
• Joins DNA fragments

What is the role of primase in DNA replication?

• Repairs DNA
• Seals gaps
• Unwinds DNA
• Synthesizes RNA primer

What is the function of DNA helicase during replication?

• Adds nucleotides
• Proofreads DNA
• Joins Okazaki fragments
• Separates DNA strands

Which of the following is a basic amino acid?

• Valine
• Alanine
• Serine
• Lysine

What is the main function of antibodies?

• Store energy
• Transport nutrients
• Defend against pathogens
• Regulate hormones