CELL MODIFICATIONS

What is the primary function of villi in the small intestine?

• Absorption of nutrients

• Secretion of digestive enzymes

• Protection against pathogens

• Production of bile

What is the primary function of xylem in plants?

• Support and structure for the plant

• Transport of sugars from leaves to roots

• Photosynthesis

• Transport of water and minerals from roots to leaves

What is the primary function of root hairs in plants?

• Protecting the root from pathogens

• Transporting nutrients to the leaves

• Absorption of water and minerals from the soil

• Anchoring the plant to the soil

Root hairs increase the surface area of the root primarily to:

• Enhance water retention

• Absorb more sunlight

• Improve nutrient absorption

• Strengthen the root structure

What is the primary function of cilia in cells?

• Absorption of nutrients

• Photosynthesis

• Storage of genetic material

• Movement of fluids or the cell itself

Which of the following is a common location where ciliated cells are found in the human body?

• Small intestine

• Blood vessels

• Trachea

• Bone marrow

Which of the following is NOT a function of the proteins in the fluid mosaic model?

• Transporting molecules across the 

       membrane

• Serving as rigid support structures

• Acting as receptors for signal molecules

• Acting as enzymes

What role do cholesterol molecules play in the fluid mosaic model of the cell membrane?

•  They allow the cell to recognize other 

      cells

  
  

• They make the membrane less fluid and 

      more stable

  
  

• They act as enzymes to speed up 

      chemical reactions

  
  

• They provide energy for the cell

  
  

What is the magnification of the objective lens used in this photomicrograph?

What is the TOTAL MAGNIFICATION of this photomicrograph?