Cell Structure and Function

Which organelle is not easily visible under a microscope unless specifically stained?

• Nucleus
• Ribosome
• Vacuole
• Mitochondrion

How many membranes surround a mitochondrion?

• One
• Three
• Four
• Two

What is the average diameter of a mitochondrion?

• 1.0 µm
• 0.1 µm
• 2.0 µm
• 0.5 µm

What shape are mitochondria typically described as?

• Spherical
• Rod-like
• Spiral
• Sausage-shaped or cylindrical

In protists, how are food vacuoles typically formed?

• By photosynthesis
• By cellular respiration
• By mitosis
• By engulfing food particles