Cell Structure and Function

Which feature is unique to chloroplasts and not found in mitochondria?

• Double membrane
• Own DNA
• Own ribosomes
• Presence of thylakoids

Which statement about ribosomes is true?

• They contain DNA
• They are membrane-bound
• They produce ATP
• They are not surrounded by any membrane

When were ribosomes first observed under an electron microscope?

• 1945
• 1960
• 1970
• 1953

What is the main pigment responsible for absorbing light in chloroplasts?

• Carotenoids
• Xanthophylls
• Phycobilins
• Chlorophyll

Where is DNA located in chloroplasts?

• Thylakoid
• Granum
• Outer membrane
• Stroma