Grade 9 Biology Exam Review 2025

Which of the following best describes the function of the integumentary system in protecting the body?

• It produces blood cells

• It acts as a barrier against injury, infection, and UV radiation

• It stores minerals

• It absorbs nutrients

What does the circulatory system remove from your body?

• Oxygen

• Nutrients

• Waste products

• Proteins

Which vessels carry blood throughout the body?

• Nerves

• Blood vessels

• Bones

• Muscles

Which of the following is found in RNA but not in DNA?

• Adenine

• Thymine

• Uracil

• Guanine

What can result if errors occur during DNA replication?

• Enhanced cell function

• Mutations

• Faster replication

• Increased protein synthesis

What is the final product of DNA replication?

• One DNA molecule

• Two DNA molecules

• Three DNA molecules

• Four DNA molecules

What is the function of the enzyme helicase as described in the table?

• Adds nucleotides

• Unwinds the double helix

• Repairs DNA

• Synthesizes proteins

What is the nickname for helicase according to the table?

• Builder

• Unzipper

• Proofreader

• Synthesizer

What is the main function of DNA polymerase?

• Builds new DNA nucleotides to the growing DNA strand

• Synthesizes RNA primers

• Fills in the gaps and joins molecules together

• Unzips the DNA double helix

Which enzyme is called the "Gluer" in DNA replication?

• Ligase

• Polymerase

• Primase

• Helicase