Cell Structure and Function

Why are mitochondria not easily visible under a microscope without staining?

• They are inside the nucleus
• They move too fast
• They are colorless
• They are small and translucent

How many membranes surround each mitochondrion?

• One
• Three
• Four
• Two

What is the typical shape of mitochondria?

• Spherical
• Rod-like
• Flat and disc-like
• Sausage-shaped or cylindrical

Which of the following statements about mitochondria is true?

• They are always spherical
• They lack membranes
• They are uniform in size
• Their number depends on the cell's activity

What is the primary method by which food vacuoles are formed in protists?

• Pinocytosis
• Exocytosis
• Photosynthesis
• Phagocytosis