Cell Structure and Function

Which of the following statements about ribosomes is true?

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

Which cellular structure was first observed under the electron microscope by George Palade in 1953?

• Mitochondria
• Lysosomes
• Ribosomes
• Vacuoles

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

• Carotenoids
• Xanthophylls
• Phycobilins
• Chlorophyll

Which part of the chloroplast contains DNA molecules?

• Thylakoid
• Granum
• Stroma
• Outer membrane

What is the function of the inner chloroplast membrane?

• Absorbs light
• Stores DNA
• Synthesizes proteins
• Regulates molecule passage