Cell Structure and Function

Which of the following is a function of the cell wall?

• Carry out photosynthesis
• Produce ATP
• Regulate gene expression
• Prevent excessive uptake of water

Which of the following is NOT found in the cell wall of algae?

• Cellulose
• Galactans
• Mannans
• Hemicellulose

Which of the following is a feature of the fluid mosaic model?

• Rigid protein layers
• Fixed protein positions
• Uniform composition throughout
• Proteins float in a fluid lipid bilayer

What is the primary purpose of the secondary cell wall?

• Enable cell division
• Store food reserves
• Facilitate transport
• Provide additional strength

Which statement best describes facilitated diffusion?

• Movement against the gradient using ATP
• Movement of water across the membrane
• Bulk transport of materials
• Movement of molecules across the membrane via carrier proteins down the gradient